WO2018147348A1 - Aluminum extruded flat perforated pipe exhibiting excellent outer surface corrosion resistance, and aluminum heat exchanger obtained using same - Google Patents

Aluminum extruded flat perforated pipe exhibiting excellent outer surface corrosion resistance, and aluminum heat exchanger obtained using same Download PDF

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Publication number
WO2018147348A1
WO2018147348A1 PCT/JP2018/004301 JP2018004301W WO2018147348A1 WO 2018147348 A1 WO2018147348 A1 WO 2018147348A1 JP 2018004301 W JP2018004301 W JP 2018004301W WO 2018147348 A1 WO2018147348 A1 WO 2018147348A1
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Prior art keywords
aluminum
tube
sacrificial anode
flat multi
hole
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PCT/JP2018/004301
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French (fr)
Japanese (ja)
Inventor
中村　真一
尚希 山下
永尾　誠一
壽久 内藤
沖ノ谷　剛
市川　晋
伊藤　彰
Original Assignee
株式会社Uacj
株式会社Ｕａｃｊ押出加工
株式会社デンソー
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Application filed by 株式会社Uacj, 株式会社Ｕａｃｊ押出加工, 株式会社デンソー filed Critical 株式会社Uacj
Priority to DE112018000792.8T priority Critical patent/DE112018000792T5/en
Priority to JP2018567476A priority patent/JPWO2018147348A1/en
Priority to CN201880011537.4A priority patent/CN110290884A/en
Publication of WO2018147348A1 publication Critical patent/WO2018147348A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/02—Dies
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/10—Electrodes characterised by the structure
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/12—Electrodes characterised by the material
    • C23F13/14—Material for sacrificial anodes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2201/00—Type of materials to be protected by cathodic protection
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
    • C23F2213/32—Pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing

Definitions

  • the present invention relates to an aluminum extruded flat multi-hole tube having excellent outer surface anticorrosion properties and an aluminum heat exchanger using the same, and in particular, transmission of heat exchangers, particularly automobile heat exchangers such as car air conditioners and radiators.
  • the present invention relates to an aluminum extruded flat multi-hole tube for a heat exchanger that can be suitably used as a heat tube and has excellent outer surface corrosion resistance.
  • an aluminum extruded flat multi-hole tube having a flat cross-sectional shape as a whole obtained by extrusion processing of an aluminum material has been used as a refrigerant passage tube of an automotive heat exchanger, and a refrigerant is provided in the refrigerant passage.
  • a heat exchanger is constructed by assembling and brazing and fixing aluminum fins clad with an Al-Si-based aluminum brazing material in a direction perpendicular to the refrigerant passage tube, and By flowing air as a heat exchange fluid along such fins, heat exchange is performed between the refrigerant and the air.
  • Patent Document 1 Japanese Patent Laid-Open No. 6-142755
  • Patent Document 2 JP-A-5-222480
  • Patent Document 3 JP-A-5-222480
  • Patent Document 3 JP-A-5-222480
  • Patent Document 3 JP-A-5-222480
  • Patent Document 3 JP-A-5-222480
  • Patent Document 3 JP-A-5-222480
  • Patent Document 3 JP-A-5-222480
  • Patent Document 3 disclose flat multi-hole tubes having various cross-sectional shapes.
  • Zn is adhered to the surface of the extruded flat multi-hole tube in advance by a method such as spraying or painting. Then, Zn is diffused by subsequent brazing heating, and at that time, the Zn diffusion layer formed on the tube surface layer acts as a sacrificial anode for the tube layer deeper than that, and corrodes in the tube thickness direction. Is used to extend the penetrating life of the tube.
  • the extruded flat multi-hole tube requires a Zn adhesion step such as spraying or coating of Zn after being extruded, and further, after that, a fluoride flux required for brazing is applied. From the point where a flux coating process to the entire core is required after being assembled to the process or heat exchanger core, the increase in the manufacturing process is unavoidable, and there are problems such as increasing the manufacturing cost. Yes.
  • Patent Document 2 Japanese Patent Application Laid-Open No. 5-222480
  • JP-A-63-97309 uses a composite billet composed of an aluminum core material forming material and a skin material forming material made of an Al—Si based aluminum brazing alloy material.
  • a method of manufacturing a clad tube in which a brazing filler metal layer is clad on the outer surface flat portion of the tube peripheral wall by simultaneously extruding has been proposed, but such a clad tube has a sacrificial anode effect. There is no external anticorrosive property.
  • the sacrificial anode part can be advantageously exposed to form a sacrificial anode part, and the sacrificial anode effect exhibited by the presence of the sacrificial anode part can be Thus, it has been found that excellent outer surface corrosion resistance can be imparted.
  • the present invention has been completed based on such knowledge, and the problem to be solved is an aluminum extrusion flattened shape which is obtained by extrusion processing of an aluminum material and exhibits a flat cross-sectional shape as a whole.
  • the multi-hole tube there is to effectively enhance the anticorrosion property at the outer peripheral portion of the tube, and another problem is that the aluminum extruded flat multi-hole tube in which the anticorrosion property at the outer peripheral portion of the tube is remarkably enhanced by the sacrificial anode effect
  • Another object of the present invention is to provide an aluminum heat exchanger having excellent corrosion resistance obtained by using the heat exchanger.
  • an extruded tube having an overall flat cross-sectional shape obtained by extrusion processing of an aluminum material, the tube shafts independently of each other.
  • An aluminum extruded flat multi-hole tube having a plurality of flow paths extending in parallel to the direction and arranged in the longitudinal direction of the flat shape through internal partition walls extending in the tube axis direction.
  • the aluminum material is formed by extrusion using an aluminum tube main body material and an aluminum sacrificial anode material that is electrochemically lower than the aluminum tube main body material, and is formed over the entire outer peripheral surface of the tube or at least the tube.
  • the outer surface anticorrosion characterized in that the sacrificial anode part is formed by exposing the aluminum sacrificial anode material to a part of the flat part on the outer peripheral surface.
  • an aluminum alloy material containing Zn is used as the aluminum sacrificial anode material.
  • this invention is comprised including the aluminum extrusion flat multi-hole pipe
  • the gist of the present invention is also an aluminum heat exchanger.
  • a sacrificial anode portion made of an aluminum sacrificial anode material is formed over the entire outer peripheral surface of the tube or at least a part of the flat portion of the outer peripheral surface of the tube. Is exposed, and the sacrificial anode effect based on the sacrificial anode material can effectively enhance the outer surface anticorrosive property, and thereby, tubes such as radiators, heaters, etc. It can be advantageously used as a heat transfer tube of a heat exchanger excellent in corrosion resistance on the outer surface side.
  • the aluminum extruded flat multi-hole tube according to the present invention is composed of an aluminum tube main body material and an aluminum sacrificial anode material, and is formed by co-extrusion of these two materials.
  • the outer surface anticorrosion property can be effectively exhibited by the aluminum sacrificial anode material while ensuring the aluminum tube body material, which allows the design of the desired extruded flat multi-hole tube. It also has the advantage that the degree can be increased advantageously.
  • the aluminum extruded flat in an aluminum heat exchanger constructed by assembling an aluminum extruded flat multi-hole tube according to the present invention and an aluminum outer fin and joining them by brazing heating, the aluminum extruded flat
  • the excellent outer surface anticorrosive properties of the hole tube can advantageously increase the anticorrosion properties as a heat exchanger.
  • FIG. 1 schematically shows an example of an aluminum extruded flat multi-hole pipe according to the present invention in the form of a cross section that is a cross section perpendicular to the longitudinal direction (tube axis direction).
  • the flat multi-hole tube 10 according to the present invention is an extruded tube made of an aluminum material having a flat cross-sectional shape as a whole, and is composed of rectangular holes extending in parallel to the tube axis direction independently of each other.
  • the thickness Ts is 90% or less, desirably 80% or less, and the lower limit thereof is preferably 1% or more, more preferably 5% or more. . That is, Ta ⁇ 0.9 ⁇ Ts and Ta ⁇ 0.01 ⁇ Ts are preferable.
  • the thickness Ta of the sacrificial anode portion 18 exceeds 90% of the wall thickness Ts of the tube peripheral wall portion 14, Zn contained in the sacrificial anode portion 18 becomes thicker in the tube peripheral wall portion 14 during brazing heating.
  • the pipe peripheral wall part 14 is liable to cause through corrosion, and the thickness of the pipe peripheral wall part 14 becomes too thin. As a result, problems such as a decrease in pressure resistance are caused.
  • the sacrificial anode portion 18 is configured to be present on the outer peripheral surface side of the tube peripheral wall portion 14 at a predetermined thickness, whereby the pipe peripheral wall portion 14 is preferentially corroded by the sacrificial anode effect. As a result, excellent outer surface anticorrosive properties can be advantageously imparted to the outer peripheral portion of the pipe.
  • the sacrificial anode portion 18 as described above is exposed over the entire tube circumferential length L of the flat multi-hole tube 10 or at least on the outer surface side of the tube peripheral wall portion 14 of a part of the flat portion.
  • the exposure range is desirably configured to be exposed in a range corresponding to 50% or more and 100% or less of the total circumference L of the outer peripheral surface of the pipe, preferably 60% or more, more preferably 70% or more is advantageously employed.
  • the corrosion resistance due to the sacrificial anode effect can be expressed more advantageously.
  • the most preferable state is a case where the sacrificial anode portion 18 exists over the entire circumference L of the tube as shown in FIG.
  • the thickness of the sacrificial anode portion 18 in the entire circumference L of the tube does not have to be the same over the entire exposed region.
  • it is desirable that the sacrificial anode portion 18 is continuously exposed with respect to the entire circumference L of the tube, but is partially discontinuous or at a predetermined length. Even if it is exposed in a form extending in the pipe axis direction at a plurality of positions in the pipe circumferential direction, there is no problem.
  • the aluminum sacrificial anode material used in the present invention is electrochemically less basic than the aluminum tube body material. Therefore, the potential difference between these materials exceeds 0 mV, but is preferably in the range of 5 mV to 300 mV. When this potential difference is 5 mV or more, the sacrificial anode effect is surely easily exhibited even in a more severe corrosive environment. On the other hand, when the potential difference exceeds 300 mV, the sacrificial anode effect becomes prominent, and problems such as severe corrosion consumption of the sacrificial anode material are caused.
  • the sacrificial anode portion 18 is effective in the sacrificial anode effect due to being lower in potential than the flow passage 12 side portion made of the aluminum tube main body material in the tube peripheral wall portion 14, and the like. This is because the corrosion resistance of the inner surface of the flow path can be expressed more advantageously.
  • surroundings of the flow path 12 containing the internal partition part 16 located between the adjacent flow paths 12 and 12 is conventionally used by extrusion process.
  • Aluminum materials used in the production of flat multi-hole tubes can be used as they are, and for example, JIS-named A1000 series pure aluminum materials, A3000 series aluminum alloy materials, etc. can be used.
  • a predetermined amount (for example, about 0.1 to 0.7 mass%) of Cu may be contained as an alloy component.
  • the sacrificial anode material for providing the sacrificial anode portion 18 a known aluminum alloy material that is electrochemically lower than the above-described tube body material, in other words, has a lower natural potential, is used.
  • the alloy component an aluminum alloy containing a predetermined amount of Zn, generally about 0.1 to 10% by mass, or the like is used.
  • the flat multi-hole tube 10 uses the above-described tube body material and sacrificial anode material as the aluminum material to be extruded, and simultaneously extrudes these materials from the port hole die.
  • the tube body material and the sacrificial anode material are generally used as a composite billet having a core-sheath structure.
  • the hollow portion provided in the sacrificial anode material for example, a rectangular shape (including a curved corner portion), a circle, an oval, an ellipse, an oval and an oval
  • a pipe body material having a cross-sectional shape corresponding to the hollow portion such as a combination of polygons and the like, and having a cross-sectional dimension optimized, and joining and integrating them by welding or the like, thereby
  • a composite billet having a structure in which a sheath portion made of a sacrificial anode material is integrally formed around a core portion made of a main body material is used.
  • a sheath billet is formed by providing a through-hole of a predetermined size at the center of a billet made of a sacrificial anode material, and
  • a sheath billet is produced in the form of being divided into two, and the core is formed in the space of the two divided billets.
  • the target composite billet it is possible to form the target composite billet by a method of fixing the whole by welding or the like and integrating them.
  • a method of hot extrusion using a die having a plurality of extrusion ports, a so-called porthole die is applied to such a composite billet as in the case of manufacturing a conventional extruded flat multi-hole tube.
  • the target extruded flat multi-hole tube can be obtained.
  • a die having a long extrusion port arranged to correspond to a plurality of flow paths of the flat multi-hole tube the composite billet is arranged so that the longitudinal direction in the predetermined cross-sectional shape of the tube body material arranged inside the composite billet coincides with the longitudinal direction of the extrusion port of the die, Extrusion is performed.
  • the sacrificial anode material arranged on the outer surface of the composite billet is effective over the circumference of the flat shape of the resulting flat multi-hole tube. Therefore, the sacrificial anode part can be advantageously exposed to the pipe outer peripheral surface of the pipe peripheral wall part.
  • the aluminum extruded flat multi-hole tube according to the present invention as described above can be suitably used as a refrigerant flow path member in a heat exchanger.
  • the aluminum extrusion flat multi-hole pipe according to the present invention as a refrigerant passage pipe, for example, a pair of aluminum header tanks arranged at a distance from each other, and a width direction ventilation direction between both header tanks And a plurality of extruded aluminum flat multi-hole tubes arranged in parallel with each other at intervals in the longitudinal direction of the header tank and connected to both header tanks, and adjacent flat multi-holes
  • the heat exchanger is constructed in a structure comprising an aluminum side plate brazed to such fins.
  • the aluminum extruded flat multi-hole pipe according to the present invention can be used as a refrigerant passage pipe in various known heat exchangers. That's where it is.
  • a pair of header tanks in a heat exchanger distributes and flows refrigerant or coolant from one header tank to a flat multi-hole tube, and the other header tank is flat flat.
  • the coolant or coolant that has flowed out of the hole tube is gathered.
  • the header plate and the header plate are brazed oppositely, or the plate is bent into a tubular shape.
  • an extruded tube extruded into a tubular shape or the like is used.
  • Composite billets a to h and j made of a tube body material and a sacrificial anode material having the component composition (%: mass basis) shown in Table 1 below are manufactured, and each of them is a flat multi-hole tube by hot extrusion. A to H and J were obtained. Moreover, the single billet i of the component composition shown in following Table 1 was manufactured, and the flat multi-hole pipe I was obtained by the hot extrusion process. Then, using the obtained flat multi-hole tubes A to J, the following (1) measurement of the formation range of the sacrificial anode part, (2) potential measurement, and (3) evaluation of the outer surface anticorrosion property were performed.
  • various pipe body billets of 90 mm ⁇ were produced by DC casting in accordance with a conventional method using the components for the pipe body materials in the composite billets a to h and j shown in Table 1.
  • sacrificial anode billets prepared in the same manner using the components for sacrificial anode materials in the composite billets a to h and j shown in Table 1 above are variously combined in a circular dimension within the range of 5 mm to 85 mm to obtain a predetermined number.
  • a through hole into which the processed tube body material billet can be inserted is formed in the central portion of the cross section of the sacrificial anode billet, and the tube body billet is inserted into the through hole, and the tubes are further inserted.
  • the main body billet and the sacrificial anode billet are fixed and joined to each other in the longitudinal direction by MIG welding, and each composite billet ah and j has a cross-sectional shape as shown in FIG. It was produced as an integral composite billet 20.
  • the simple billet i which consists of a pipe
  • the single billet i made of the tube body material component is a single billet shown as 30 in FIG. 3, which is the same as the conventional material not using the sacrificial anode billet.
  • reference numerals 22 and 32 denote tube body billets
  • reference numeral 24 denotes a sacrificial anode billet.
  • the composite billet 20 or the single billet 30 thus obtained is heated to 500 ° C. with a billet heater, and then provided with an extrusion port for forming eight rectangular holes (eight flow paths).
  • an extrusion port for forming eight rectangular holes (eight flow paths).
  • the thickness of the sacrificial anode portion (18) formed on the tube peripheral wall portion (14) is the thickest. In the region, it is 80% or less of the thickness of the pipe peripheral wall (14), and more than 50% of the pipe outer peripheral length (L) of such a flat multi-hole pipe (10). It was observed that the sacrificial anode part (18) was exposed.
  • the sacrificial anode portion (18) formed by the sacrificial anode billet in the longitudinal direction of the extrusion has a tube peripheral wall portion. It was also confirmed that (14) was stably exposed on the outer periphery of the tube.
  • a flat multi-hole tube I obtained by carrying out hot extrusion using a porthole die using a single billet 30 composed of a billet composition i (Al-0.4% Cu) is a sacrificial anode billet. Since it was not used, no exposed portion of the sacrificial anode portion 18 was present on the outer peripheral surface of the tube. Moreover, in the flat multi-hole pipe J obtained from the composite billet j produced using the billet processed into a square shape of 60 mm ⁇ 60 mm as the pipe body billet, the sacrifice formed on the pipe peripheral wall portion (14) The thickness of the anode part (18) was 93% of the thickness of the pipe peripheral wall part (14) at the thickest part. Further, the ratio of the total length of the sacrificial anode portion (18) to the tube outer peripheral length (L) was 90%.
  • brazing heating for fin bonding is assumed for flat multi-hole tubes A to H and flat multi-hole tubes I and J, respectively, when they are used as heat transfer tubes in a heat exchanger. And after heat-processing 600 degreeC * 3 minutes, they were cut
  • the entire surface with the silicone resin except for the part where the lead wire for potential measurement is connected to one side of the cut end face leaving the exposed surface of the 10mm x 10mm sacrificial anode part (18) at the center in the width direction on the inner surface side.
  • the test material for measuring the potential of the sacrificial anode part (18) leaves an exposed surface of the sacrificial anode material of 10 mm ⁇ 10 mm at the center in the width direction of the outer surface on one side of the peripheral wall part, All the portions except for the portion where the potential measurement lead wire was connected to one side of the cut end face were masked with silicone resin to be electrically insulated.
  • a saturated KCl calomel electrode (SCE) is used as a reference electrode, while a 5% NaCl aqueous solution adjusted to pH 3 with acetic acid is used as a test solution.
  • SCE saturated KCl calomel electrode
  • a 5% NaCl aqueous solution adjusted to pH 3 with acetic acid is used as a test solution.
  • a method of measuring each potential after immersing the test material in the solution for 24 hours while stirring at room temperature was employed.
  • the potential difference between the sacrificial anode portion (18) (sacrificial anode material) and the tube body material of the flat multi-hole tubes A to H after the assumed brazing heating is as follows. 3 to 350 mV, all showing results having an effective sacrificial anode effect.
  • the flat multi-hole tube I is composed of only the tube main body material similar to the conventional material without using the sacrificial anode material.
  • the potential difference was 0 mV because it was a flat multi-hole tube.
  • the sacrificial anode portion (18) (sacrificial anode material) of the flat multi-hole tube J after the assumed brazing heating was performed.
  • the tube body material was 150 mV, which resulted in a sacrificial anode effect.
  • brazing heating for fin bonding is assumed for flat multi-hole tubes A to H and flat multi-hole tubes I to J when they are used as heat transfer tubes in a heat exchanger. After heat treatment at 600 ° C. for 3 minutes, they were cut to a length of 100 mm in the longitudinal direction of extrusion, and both ends of the cut end face where the flow channel was exposed were masked with silicone resin.
  • the test liquid used for the SWAAT test produced the artificial seawater by ASTM D1141, and added acetic acid to this artificial seawater, and adjusted it to pH3.
  • the test condition was 0.5 hour spray-wet 1.5 hour as one cycle, and this cycle was repeated, and the outer surface anticorrosion evaluation test was conducted for three levels of 10 days, 20 days, and 30 days. .
  • the cross-section was made with water-resistant paper for the maximum corroded part, and further mirror-finished by buffing.
  • the corrosion situation of the pipe outer peripheral surface of the material was observed.
  • penetration did not occur after 20 days, and if penetration was observed after 30 days or not penetrated ( ⁇ ), penetration after 10 days. When it did not occur and penetration was observed after 20 days, it was evaluated as ( ⁇ ), and when penetration was observed after 10 days, it was evaluated as (x).
  • Table 4 below shows the results of evaluating the flat multi-hole tubes A to H and flat multi-hole tubes I to J by performing the above SWAAT test for 10, 20, and 30 days, respectively.
  • the flat multi-hole tubes A to H had no through-holes penetrating the peripheral wall portion in the evaluation after 10 days of the SWAAT test. Further, in the evaluation after 20 days, in the flat multi-hole tubes B, C, F, and H, a through-hole penetrating the tube peripheral wall portion was confirmed. Furthermore, in the evaluation after 30 days, no through hole was observed in any flat multi-hole tube other than B, C, F, and H. Therefore, it was recognized that all of the flat multi-hole tubes A to H are effectively protected from the outer surface by the sacrificial anode effect due to the presence of the sacrificial anode portion (18).
  • the flat multi-hole tube I is a flat multi-hole tube using only the tube main body material similar to the conventional material without using the sacrificial anode material, and therefore the SWAAT test is performed for 10, 20, and 30 days.
  • the SWAAT test is performed for 10, 20, and 30 days.
  • corrosion holes penetrating the pipe peripheral wall portion were generated in all the evaluations after the test.
  • the sacrificial anode portion (18) does not exist on the outer peripheral portion of the tube, so the sacrificial anode effect cannot be obtained and the outer surface anticorrosive effect cannot be exhibited. It was recognized that penetration had occurred early.
  • each of the penetrating portions is a portion where the sacrificial anode portion (18) is formed to exceed 90%, and the Zn contained in the sacrificial anode portion (18) is heat treatment corresponding to brazing heating. Occasionally, it diffused throughout the pipe wall (14), and as a result, the sacrificial anode part (18) was consumed at an early stage, and it was recognized that penetration occurred early.

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Abstract

An aluminum extruded flat perforated pipe, wherein the corrosion resistance of the outer-circumferential surface of the pipe is effectively increased. An aluminum extruded flat perforated pipe 10 formed by extruding an aluminum pipe main body material and a more electrochemically basic aluminum sacrificial anode material, wherein a sacrificial anode section 18 is formed by exposing the aluminum sacrificial anode material along the entirety of the pipe outer circumference length L on the outer surface side of a pipe circumferential wall section 14, or in at least part of the flat section thereof.

Description

外面防食性に優れたアルミニウム押出扁平多穴管及びそれを用いてなるアルミニウム製熱交換器Aluminum extruded flat multi-hole tube excellent in outer surface anticorrosion property and aluminum heat exchanger using the same
　本発明は、外面防食性に優れたアルミニウム押出扁平多穴管とそれを用いてなるアルミニウム製熱交換器に係り、特に、熱交換器、中でもカーエアコン、ラジエータ等の自動車用熱交換器の伝熱管として好適に用いることが出来る、外面防食性に優れた熱交換器用アルミニウム押出扁平多穴管に関するものである。 The present invention relates to an aluminum extruded flat multi-hole tube having excellent outer surface anticorrosion properties and an aluminum heat exchanger using the same, and in particular, transmission of heat exchangers, particularly automobile heat exchangers such as car air conditioners and radiators. The present invention relates to an aluminum extruded flat multi-hole tube for a heat exchanger that can be suitably used as a heat tube and has excellent outer surface corrosion resistance.
　従来より、アルミニウム材料の押出加工によって得られた、全体として扁平な横断面形状を呈するアルミニウム押出扁平多穴管は、自動車用熱交換器の冷媒通路管として使用されており、その冷媒通路に冷媒を流通せしめる一方、かかる冷媒通路管に対して直角な方向に、Ａｌ－Ｓｉ系のアルミニウムろう材がクラッドされたアルミニウムフィンを組み付け、ろう付け固定することによって、熱交換器を構成し、そして、そのようなフィンに沿って、熱交換流体としての空気を流すことによって、冷媒と空気との間で熱交換が行われるようになっている。 Conventionally, an aluminum extruded flat multi-hole tube having a flat cross-sectional shape as a whole obtained by extrusion processing of an aluminum material has been used as a refrigerant passage tube of an automotive heat exchanger, and a refrigerant is provided in the refrigerant passage. A heat exchanger is constructed by assembling and brazing and fixing aluminum fins clad with an Al-Si-based aluminum brazing material in a direction perpendicular to the refrigerant passage tube, and By flowing air as a heat exchange fluid along such fins, heat exchange is performed between the refrigerant and the air.
　また、そこで用いられる押出扁平多穴管としては、通常、アルミニウム若しくはアルミニウム合金のビレットをポートホール押出しして得られたものが採用されており、例えば、特開平６－１４２７５５号公報（特許文献１）、特開平５－２２２４８０号公報（特許文献２）、ＷＯ２０１３／１２５６２５（特許文献３）等には、各種の断面形態を呈する扁平多穴管が、明らかにされている。 Further, as the extruded flat multi-hole tube used there, usually, one obtained by extruding a billet of aluminum or an aluminum alloy by a porthole is adopted, for example, Japanese Patent Laid-Open No. 6-142755 (Patent Document 1). ), JP-A-5-222480 (Patent Document 2), WO2013 / 125625 (Patent Document 3) and the like disclose flat multi-hole tubes having various cross-sectional shapes.
　しかしながら、かかる熱交換器の伝熱チューブとして用いられる、押出加工によって得られる扁平多穴管にあっては、一般に、その管外周部の表面には、何等防食処理が施されていないために、腐食が惹起されるという問題が内在しており、そしてそのような腐食の進行によって、管壁を貫通する腐食孔等が生じたりすると、熱交換器としての機能を全く喪失することとなるのである。 However, in the flat multi-hole tube obtained by extrusion, which is used as a heat transfer tube of such a heat exchanger, the surface of the outer periphery of the tube is generally not subjected to any anticorrosion treatment, The problem of corrosion is inherent, and if such corrosion progresses to create corrosion holes that penetrate the tube wall, the function as a heat exchanger will be completely lost. .
　そこで、そのような熱交換器においては、押出扁平多穴管の管外表面の腐食を防止するために、従来から、押出扁平多穴管の表面に予め溶射或いは塗装等の方法によってＺｎを付着させておき、その後のろう付け加熱によりＺｎを拡散させ、その際、チューブ表層に形成されたＺｎ拡散層が、それより深部のチューブ層に対して犠牲陽極として働き、管肉厚方向への腐食を抑制する手法が採用され、これによって、管の貫通寿命の延長が図られている。而して、この場合、押出扁平多穴管には、押し出された後に、Ｚｎの溶射或いは塗装等のＺｎ付着工程が必要となり、更にその後に、ろう付けに必要となるフッ化物系フラックスの塗布工程、又は熱交換器コアに組み付けられた後にコア全体へのフラックス塗布工程が必要となるところから、製造工程の増加が避けられず、製造コストの上昇を招いてしまう等の問題が内在している。 Therefore, in such a heat exchanger, in order to prevent corrosion of the outer surface of the extruded flat multi-hole tube, conventionally, Zn is adhered to the surface of the extruded flat multi-hole tube in advance by a method such as spraying or painting. Then, Zn is diffused by subsequent brazing heating, and at that time, the Zn diffusion layer formed on the tube surface layer acts as a sacrificial anode for the tube layer deeper than that, and corrodes in the tube thickness direction. Is used to extend the penetrating life of the tube. Thus, in this case, the extruded flat multi-hole tube requires a Zn adhesion step such as spraying or coating of Zn after being extruded, and further, after that, a fluoride flux required for brazing is applied. From the point where a flux coating process to the entire core is required after being assembled to the process or heat exchanger core, the increase in the manufacturing process is unavoidable, and there are problems such as increasing the manufacturing cost. Yes.
　このため、上記した押出扁平多穴管の一つとして、前記特開平５－２２２４８０号公報（特許文献２）にも明らかにされている如く、特定の成分組成のアルミニウム合金を単一で用いて、そのビレットを押出加工することによって、適切な防食性を具備する扁平多穴管を製造することが、一つの対策として提案されているのであるが、外面耐食性においては充分でなく、近年における高い防食性、コスト低減の要請に充分に応え得ないのみならず、チューブ全体を特定材質のアルミニウム合金にて構成するものであるところから、得られるチューブの特性が、かかる特定合金組成のアルミニウム合金によって制限を受けるという問題も内在している。 Therefore, as one of the above-described extruded flat multi-hole pipes, an aluminum alloy having a specific component composition is used singly as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-222480 (Patent Document 2). It has been proposed as a measure to produce a flat multi-hole tube having an appropriate anticorrosion property by extruding the billet, but the outer surface corrosion resistance is not sufficient and has recently been high. In addition to not being able to fully meet the demands for anticorrosion and cost reduction, the entire tube is made of a specific material aluminum alloy. The problem of restrictions is also inherent.
　なお、特開昭６３－９７３０９号公報（特許文献４）には、アルミニウム芯材形成材料とＡｌ－Ｓｉ系のアルミニウムろう合金材料からなる表皮材形成材料とから構成された複合ビレットを用いて、同時に押出加工することによって、管周壁部の外面平坦部に対し、ろう材層がクラッドされてなるクラッド管を製造する方法が提案されているが、そのようなクラッド管には、犠牲陽極効果がなく、外面防食性を有していない。 JP-A-63-97309 (Patent Document 4) uses a composite billet composed of an aluminum core material forming material and a skin material forming material made of an Al—Si based aluminum brazing alloy material. A method of manufacturing a clad tube in which a brazing filler metal layer is clad on the outer surface flat portion of the tube peripheral wall by simultaneously extruding has been proposed, but such a clad tube has a sacrificial anode effect. There is no external anticorrosive property.
特開平６－１４２７５５号公報JP-A-6-142755 特開平５－２２２４８０号公報JP-A-5-222480 ＷＯ２０１３／１２５６２５WO2013 / 125625 特開昭６３－９７３０９号公報JP-A-63-97309
　かかる状況下、本発明者らは、アルミニウム材料の押出加工によって得られるアルミニウム押出扁平多穴管において、その管外周部の外面耐食性を向上させるべく鋭意検討した結果、押出加工されるアルミニウム材料として、通常のアルミニウム管本体材料と、Ａｌ－Ｚｎ系のアルミニウム犠牲陽極材料とを用いて、同時に熱間押出加工することにより、得られるアルミニウム押出扁平多穴管の管外周部に、かかるＡｌ－Ｚｎ系のアルミニウム犠牲陽極材料を有利に露呈せしめて、犠牲陽極部を形成することが出来、そしてその犠牲陽極部の存在によって発揮される犠牲陽極効果により、アルミニウム押出扁平多穴管の管外周部に対して、優れた外面防食性を付与し得ることを見出したのである。 Under such circumstances, as a result of intensive studies to improve the outer surface corrosion resistance of the outer peripheral portion of the aluminum extruded flat multi-hole tube obtained by extruding the aluminum material, the present inventors, as an aluminum material to be extruded, By using a normal aluminum tube main body material and an Al—Zn-based aluminum sacrificial anode material and simultaneously performing hot extrusion, the Al—Zn-based material is formed on the outer periphery of the obtained aluminum extruded flat multi-hole tube. The sacrificial anode part can be advantageously exposed to form a sacrificial anode part, and the sacrificial anode effect exhibited by the presence of the sacrificial anode part can be Thus, it has been found that excellent outer surface corrosion resistance can be imparted.
　従って、本発明は、かくの如き知見に基づいて完成されたものであって、その解決課題とするところは、アルミニウム材料の押出加工によって得られる、全体として扁平な横断面形状を呈するアルミニウム押出扁平多穴管において、その管外周部における防食性を効果的に高めることにあり、また他の課題とするところは、管外周部の防食性を犠牲陽極効果によって著しく高めたアルミニウム押出扁平多穴管と、それを用いて得られる防食性に優れたアルミニウム製熱交換器を提供することにある。 Therefore, the present invention has been completed based on such knowledge, and the problem to be solved is an aluminum extrusion flattened shape which is obtained by extrusion processing of an aluminum material and exhibits a flat cross-sectional shape as a whole. In the multi-hole tube, there is to effectively enhance the anticorrosion property at the outer peripheral portion of the tube, and another problem is that the aluminum extruded flat multi-hole tube in which the anticorrosion property at the outer peripheral portion of the tube is remarkably enhanced by the sacrificial anode effect Another object of the present invention is to provide an aluminum heat exchanger having excellent corrosion resistance obtained by using the heat exchanger.
　そして、本発明にあっては、かくの如き課題の解決のために、アルミニウム材料の押出加工によって得られた、全体として扁平な横断面形状を呈する押出管であって、互いに独立して管軸方向に平行に延びる複数の流路を有し、且つそれら流路が、管軸方向に延びる内部隔壁部を介して、扁平形状の長手方向に配列せしめられているアルミニウム押出扁平多穴管にして、前記アルミニウム材料としてアルミニウム管本体材料とこのアルミニウム管本体材料よりも電気化学的に卑なアルミニウム犠牲陽極材料とを用いた押出加工によって形成されていると共に、管外周面の全域に、又は少なくとも管外周面における平坦部の一部に、前記アルミニウム犠牲陽極材料が露呈せしめられて、犠牲陽極部が形成されていることを特徴とする外面防食性に優れたアルミニウム押出扁平多穴管を、その要旨とするものである。 In the present invention, in order to solve the problems as described above, an extruded tube having an overall flat cross-sectional shape obtained by extrusion processing of an aluminum material, the tube shafts independently of each other. An aluminum extruded flat multi-hole tube having a plurality of flow paths extending in parallel to the direction and arranged in the longitudinal direction of the flat shape through internal partition walls extending in the tube axis direction. The aluminum material is formed by extrusion using an aluminum tube main body material and an aluminum sacrificial anode material that is electrochemically lower than the aluminum tube main body material, and is formed over the entire outer peripheral surface of the tube or at least the tube. The outer surface anticorrosion characterized in that the sacrificial anode part is formed by exposing the aluminum sacrificial anode material to a part of the flat part on the outer peripheral surface. Excellent aluminum extruded flat multi-hole tube, it is an gist thereof.
　なお、かかる本発明において、有利には、管横断面における前記内部隔壁部以外の管周壁部において、前記犠牲陽極部が、該管周壁部の厚さの９０％以下の割合で存在せしめられている。 In the present invention, advantageously, the sacrificial anode portion is present at a ratio of 90% or less of the thickness of the tube peripheral wall portion in the tube peripheral wall portion other than the internal partition wall portion in the tube cross section. Yes.
　また、本発明にあっては、上記した犠牲陽極部は、管横断面において、前記管外周面の周長の５０％以上、１００％以下の割合で存在させられて、管外周面に露呈せしめられていることが望ましいのである。 In the present invention, the sacrificial anode portion described above is present in a ratio of 50% or more and 100% or less of the peripheral length of the outer peripheral surface of the tube in the cross section of the tube, and is exposed to the outer peripheral surface of the tube. It is desirable that
　さらに、かかる本発明に従うアルミニウム押出扁平多穴管の望ましい態様の一つにあっては、前記アルミニウム犠牲陽極材料は、前記アルミニウム管本体材料よりも電気化学的に卑であり、その電位差は、５ｍＶ以上、３００ｍＶ以下であることが好ましい。 Furthermore, in one of the desirable embodiments of the aluminum extruded flat multi-hole tube according to the present invention, the aluminum sacrificial anode material is electrochemically lower than the aluminum tube body material, and the potential difference is 5 mV. As mentioned above, it is preferable that it is 300 mV or less.
　更にまた、本発明に従うアルミニウム押出扁平多穴管の別の望ましい態様の一つにあっては、前記押出加工されるアルミニウム材料として、前記アルミニウム管本体材料と前記アルミニウム犠牲陽極材料とから構成される複合ビレットが用いられることとなる。 Furthermore, in another desirable aspect of the aluminum extruded flat multi-hole tube according to the present invention, the extruded aluminum material is composed of the aluminum tube main body material and the aluminum sacrificial anode material. A composite billet will be used.
　加えて、本発明の他の望ましい態様にあっては、前記複合ビレットが、前記アルミニウム管本体材料からなる芯ビレットと、該芯ビレットの周囲に位置する、前記アルミニウム犠牲陽極材料からなる鞘ビレットとからなる一体的な芯鞘構造を有している。 In addition, in another desirable aspect of the present invention, the composite billet includes a core billet made of the aluminum tube main body material, and a sheath billet made of the aluminum sacrificial anode material, which is located around the core billet. Has an integral core-sheath structure.
　また、本発明に従うアルミニウム押出扁平多穴管にあっては、前記押出管が、一般に、ポートホールダイスを用いた前記アルミニウム材料の押出加工によって、形成されることとなる。 Also, in the aluminum extruded flat multi-hole tube according to the present invention, the extruded tube is generally formed by extrusion processing of the aluminum material using a porthole die.
　なお、本発明に従うアルミニウム押出扁平多穴管の好ましい態様の一つにあっては、前記アルミニウム管本体材料として、ＪＩＳ称呼のＡ１０００系純アルミニウム材料又はＡ３０００系アルミニウム合金材料が用いられることとなる。 In one preferred embodiment of the aluminum extruded flat multi-hole tube according to the present invention, a JIS-named A1000 series pure aluminum material or A3000 series aluminum alloy material is used as the aluminum pipe body material.
　さらに、本発明の他の好ましい態様の一つにあっては、前記アルミニウム犠牲陽極材料として、Ｚｎを含有するアルミニウム合金材料が用いられる。 Furthermore, in another preferred embodiment of the present invention, an aluminum alloy material containing Zn is used as the aluminum sacrificial anode material.
　そして、本発明にあっては、上述の如き本発明に従うアルミニウム押出扁平多穴管と、このアルミニウム押出扁平多穴管の外面にろう付け接合されたアルミニウム製アウターフィンとを含んで構成されていることを特徴とするアルミニウム製熱交換器をも、その要旨とするものである。 And in this invention, it is comprised including the aluminum extrusion flat multi-hole pipe | tube according to this invention as mentioned above, and the aluminum outer fin brazed and joined to the outer surface of this aluminum extrusion flat multi-hole pipe | tube. The gist of the present invention is also an aluminum heat exchanger.
　このように、本発明に従う構成とされたアルミニウム押出扁平多穴管においては、その管外周面の全域に、又は少なくとも管外周面における平坦部の一部に、アルミニウム犠牲陽極材料からなる犠牲陽極部が露呈して存在せしめられているところから、かかる犠牲陽極材料に基づくところの犠牲陽極効果によって、外面防食性が効果的に高められ得ることとなるのであり、これによって、ラジエータやヒータ等、チューブ外面側の防食性に優れた熱交換器の伝熱管として有利に用いられ得ることとなったのである。 Thus, in the aluminum extruded flat multi-hole tube configured according to the present invention, a sacrificial anode portion made of an aluminum sacrificial anode material is formed over the entire outer peripheral surface of the tube or at least a part of the flat portion of the outer peripheral surface of the tube. Is exposed, and the sacrificial anode effect based on the sacrificial anode material can effectively enhance the outer surface anticorrosive property, and thereby, tubes such as radiators, heaters, etc. It can be advantageously used as a heat transfer tube of a heat exchanger excellent in corrosion resistance on the outer surface side.
　また、かかる本発明に従うアルミニウム押出扁平多穴管は、アルミニウム管本体材料とアルミニウム犠牲陽極材料とから構成され、それら２つの材料の同時押出加工によって形成されるものであるところから、管としての特性は、アルミニウム管本体材料にて確保しつつ、外面防食性は、アルミニウム犠牲陽極材料にて効果的に発揮せしめ得ることとなるのであって、これにより、目的とする押出扁平多穴管の設計自由度を有利に高め得る利点も有しているのである。 In addition, the aluminum extruded flat multi-hole tube according to the present invention is composed of an aluminum tube main body material and an aluminum sacrificial anode material, and is formed by co-extrusion of these two materials. The outer surface anticorrosion property can be effectively exhibited by the aluminum sacrificial anode material while ensuring the aluminum tube body material, which allows the design of the desired extruded flat multi-hole tube. It also has the advantage that the degree can be increased advantageously.
　さらに、本発明に従うアルミニウム押出扁平多穴管を用いて、それとアルミニウム製アウターフィンとを組み付け、ろう付け加熱により接合して、構成されるアルミニウム製熱交換器にあっては、かかるアルミニウム押出扁平多穴管の優れた外面防食特性によって、熱交換器としての防食性も有利に高められ得るものとなるのである。 Furthermore, in an aluminum heat exchanger constructed by assembling an aluminum extruded flat multi-hole tube according to the present invention and an aluminum outer fin and joining them by brazing heating, the aluminum extruded flat The excellent outer surface anticorrosive properties of the hole tube can advantageously increase the anticorrosion properties as a heat exchanger.
本発明に従うアルミニウム押出扁平多穴管の一例を模式的に示す断面説明図であって、（ａ）は、その全体図を示し、（ｂ）は、その幅方向中央部の一部を拡大して示す図であり、（ｃ）は、犠牲陽極部が異なる厚さにおいて形成されている例の幅方向端部の一部を拡大して示す断面説明図である。It is sectional explanatory drawing which shows typically an example of the aluminum extrusion flat multi-hole pipe | tube according to this invention, Comprising: (a) shows the whole figure, (b) expands a part of the width direction center part. (C) is a cross-sectional explanatory view showing an enlarged part of the width direction end portion of the example in which the sacrificial anode portion is formed in different thicknesses. 実施例において用いられた複合ビレットの横断面を示す説明図である。It is explanatory drawing which shows the cross section of the composite billet used in the Example. 実施例において用いられた単体ビレットの横断面を示す説明図である。It is explanatory drawing which shows the cross section of the single billet used in the Example.
　以下、本発明を更に具体的に明らかにするために、本発明の代表的な実施の形態について、図面を参照しつつ、詳細に説明することとする。 Hereinafter, in order to clarify the present invention more specifically, representative embodiments of the present invention will be described in detail with reference to the drawings.
　先ず、図１には、本発明に従うアルミニウム押出扁平多穴管の一例が、その長手方向（管軸方向）に対して直角な方向の断面となる横断面の形態において、模式的に示されている。そこにおいて、本発明に従う扁平多穴管１０は、全体として扁平な横断面形状を呈するアルミニウム材料の押出管であって、互いに独立して管軸方向に平行に延びる矩形形状の空孔からなる流路１２の複数を備えていると共に、それら複数の流路１２が、管幅方向において、換言すれば扁平形状の長手方向（図において左右方向）に、所定間隔を隔てて配列せしめられてなる構造とされている。また、この扁平多穴管１０の対応する上面と下面は、それぞれ平坦面とされて、そこに、従来と同様に、アルミニウム又はその合金からなる公知のプレートフィンやコルゲートフィンの如きアウターフィン（図示せず）が、ろう付け等の接合手法により取り付けられて、熱交換器として用いられ得るようになっている。なお、流路１２の横断面形状は、ここでは、矩形形状とされているが、公知の円形、楕円形、三角形、台形等の形状、又は、それらを組み合わせた各種の形状を採用することが可能である。 First, FIG. 1 schematically shows an example of an aluminum extruded flat multi-hole pipe according to the present invention in the form of a cross section that is a cross section perpendicular to the longitudinal direction (tube axis direction). Yes. The flat multi-hole tube 10 according to the present invention is an extruded tube made of an aluminum material having a flat cross-sectional shape as a whole, and is composed of rectangular holes extending in parallel to the tube axis direction independently of each other. A structure in which a plurality of the channels 12 are provided and the plurality of channels 12 are arranged at predetermined intervals in the tube width direction, in other words, in the longitudinal direction of the flat shape (left and right in the drawing). It is said that. Further, the corresponding upper surface and lower surface of the flat multi-hole tube 10 are respectively flat surfaces, and there are outer fins such as well-known plate fins or corrugated fins made of aluminum or an alloy thereof (see FIG. (Not shown) can be attached by a joining method such as brazing and used as a heat exchanger. In addition, although the cross-sectional shape of the flow path 12 is a rectangular shape here, it is possible to adopt a known circular shape, an elliptical shape, a triangular shape, a trapezoidal shape, or various shapes that are combinations thereof. Is possible.
　そして、本発明にあっては、このような構造の扁平多穴管１０において、図１の（ａ）から明らかな如く、その管周壁部１４の外周面の全周に又は少なくとも平坦部の一部において（ここでは、全周において）、アルミニウム犠牲陽極材料からなる犠牲陽極部１８が露呈せしめられるようにする一方、この犠牲陽極部１８が露呈されていない部位、つまり隣り合う流路１２、１２の間に位置する内部隔壁部１６を含む流路１２の周囲には、通常のアルミニウム管本体材料が存在せしめられて、管としての特性を保持し得るようになっている。なお、ここで、管周壁部１４は、図示の如く、扁平多穴管１０の外周壁を構成するものであって、各流路１２に対して外部隔壁部として機能するものである。 In the present invention, in the flat multi-hole tube 10 having such a structure, as is clear from FIG. 1A, the entire circumference of the outer peripheral surface of the tube peripheral wall portion 14 or at least one flat portion is provided. The sacrificial anode portion 18 made of the aluminum sacrificial anode material is exposed in the portion (here, the entire circumference), while the portion where the sacrificial anode portion 18 is not exposed, that is, the adjacent flow paths 12 and 12. An ordinary aluminum tube main body material is present around the flow path 12 including the internal partition wall portion 16 positioned between them so that the characteristics as a tube can be maintained. Here, as shown in the drawing, the tube peripheral wall portion 14 constitutes the outer peripheral wall of the flat multi-hole tube 10 and functions as an external partition wall for each flow path 12.
　また、管周壁部１４に形成される犠牲陽極部１８は、図１の（ｂ）に示される如く、管周壁部１４に位置する場合においては、その厚さＴａは、かかる管周壁部１４の厚さＴｓの９０％以下、望ましくは８０％以下の割合において存在せしめられ、その下限としては、好ましくは１％以上、より好ましくは５％以上の割合となるように、存在せしめられることとなる。即ち、Ｔａ≦０．９×Ｔｓであり、またＴａ≧０．０１×Ｔｓであることが好ましいのである。なお、犠牲陽極部１８の厚さＴａが管周壁部１４の肉厚Ｔｓの９０％を超えるようになると、犠牲陽極部１８に含有されるＺｎが、ろう付け加熱時に管周壁部１４の厚さ全体に拡散してしまい易くなって、犠牲陽極部１８の腐食消耗後に、管周壁部１４に貫通腐食が生じ易くなると共に、管周壁部１４の厚さが薄くなり過ぎて、扁平多穴管１０としての耐圧強度が低下する等の問題を惹起する。このように、犠牲陽極部１８が、所定厚さにおいて、管周壁部１４の外周面側に存在するように構成することにより、管周壁部１４においては、犠牲陽極効果により優先して腐食が進行することとなり、以て管外周部に対して、優れた外面防食性が有利に付与され得ることとなるのである。 Further, when the sacrificial anode portion 18 formed on the tube peripheral wall portion 14 is located on the tube peripheral wall portion 14 as shown in FIG. The thickness Ts is 90% or less, desirably 80% or less, and the lower limit thereof is preferably 1% or more, more preferably 5% or more. . That is, Ta ≦ 0.9 × Ts and Ta ≧ 0.01 × Ts are preferable. When the thickness Ta of the sacrificial anode portion 18 exceeds 90% of the wall thickness Ts of the tube peripheral wall portion 14, Zn contained in the sacrificial anode portion 18 becomes thicker in the tube peripheral wall portion 14 during brazing heating. It becomes easy to diffuse to the whole, and after the sacrificial anode part 18 is corroded, the pipe peripheral wall part 14 is liable to cause through corrosion, and the thickness of the pipe peripheral wall part 14 becomes too thin. As a result, problems such as a decrease in pressure resistance are caused. As described above, the sacrificial anode portion 18 is configured to be present on the outer peripheral surface side of the tube peripheral wall portion 14 at a predetermined thickness, whereby the pipe peripheral wall portion 14 is preferentially corroded by the sacrificial anode effect. As a result, excellent outer surface anticorrosive properties can be advantageously imparted to the outer peripheral portion of the pipe.
　さらに、上述の如き犠牲陽極部１８は、扁平多穴管１０の管全周長Ｌの全体に亘って、又はその少なくとも平坦部の一部の管周壁部１４の外面側において、露呈せしめられるものであって、その露呈範囲は、管外周面の全周長Ｌの５０％以上、１００％以下に相当する範囲において露呈するように構成されていることが望ましく、好ましくは６０％以上、より好ましくは７０％以上が有利に採用されることとなる。このように、犠牲陽極部１８が管全周長Ｌの５０％以上の領域に亘って露呈せしめられていることにより、犠牲陽極効果による防食性が、より有利に発現され得ることとなるのであり、特に、最も好ましい状態としては、図１の（ａ）に示される如く、犠牲陽極部１８が管全周長Ｌの全体に亘って存在している場合である。なお、管全周長Ｌにおける犠牲陽極部１８の厚さを露呈領域の全てに亘って同一とする必要はなく、例えば、図１の（ｃ）に示されるように、管周方向に異なる厚さ割合を有する犠牲陽極部１８が、露呈されるようにすることも可能である。更に、そのような犠牲陽極部１８は、管全周長Ｌに対し、連続して露呈せしめられていることが望ましいのであるが、また部分的に非連続となっていたり、或いは所定長さにおいて管周方向の複数の位置で管軸方向に延びる形態において露呈せしめられていても、何等差し支えない。 Further, the sacrificial anode portion 18 as described above is exposed over the entire tube circumferential length L of the flat multi-hole tube 10 or at least on the outer surface side of the tube peripheral wall portion 14 of a part of the flat portion. The exposure range is desirably configured to be exposed in a range corresponding to 50% or more and 100% or less of the total circumference L of the outer peripheral surface of the pipe, preferably 60% or more, more preferably 70% or more is advantageously employed. As described above, since the sacrificial anode portion 18 is exposed over a region of 50% or more of the total circumference L of the tube, the corrosion resistance due to the sacrificial anode effect can be expressed more advantageously. In particular, the most preferable state is a case where the sacrificial anode portion 18 exists over the entire circumference L of the tube as shown in FIG. Note that the thickness of the sacrificial anode portion 18 in the entire circumference L of the tube does not have to be the same over the entire exposed region. For example, as shown in FIG. It is also possible to expose the sacrificial anode portion 18 having a large proportion. Further, it is desirable that the sacrificial anode portion 18 is continuously exposed with respect to the entire circumference L of the tube, but is partially discontinuous or at a predetermined length. Even if it is exposed in a form extending in the pipe axis direction at a plurality of positions in the pipe circumferential direction, there is no problem.
　なお、本発明において用いられるアルミニウム犠牲陽極材料は、アルミニウム管本体材料よりも、電気化学的に卑となるものである。従って、それら材料の電位差は、０ｍＶ超えとなるものであるが、好ましくは５ｍＶ以上、３００ｍＶ以下の範囲である。この電位差が５ｍＶ以上となることで、より厳しい腐食環境下においても、確実に犠牲陽極効果を発揮しやすくなるのである。一方、電位差が３００ｍＶ超えとなると、犠牲陽極効果が顕著となり、犠牲陽極材の腐食消耗が激しくなる等の問題が惹起される。このように、犠牲陽極部１８が、管周壁部１４における、アルミニウム管本体材料からなる流路１２側部位等より、電位的に卑であることによって、有効な犠牲陽極効果が発揮され得て、流路内面の防食性が、より有利に発現され得ることとなるのである。 It should be noted that the aluminum sacrificial anode material used in the present invention is electrochemically less basic than the aluminum tube body material. Therefore, the potential difference between these materials exceeds 0 mV, but is preferably in the range of 5 mV to 300 mV. When this potential difference is 5 mV or more, the sacrificial anode effect is surely easily exhibited even in a more severe corrosive environment. On the other hand, when the potential difference exceeds 300 mV, the sacrificial anode effect becomes prominent, and problems such as severe corrosion consumption of the sacrificial anode material are caused. In this way, the sacrificial anode portion 18 is effective in the sacrificial anode effect due to being lower in potential than the flow passage 12 side portion made of the aluminum tube main body material in the tube peripheral wall portion 14, and the like. This is because the corrosion resistance of the inner surface of the flow path can be expressed more advantageously.
　ところで、かくの如き扁平多穴管１０において、隣り合う流路１２、１２の間に位置する内部隔壁部１６を含む流路１２の周囲を構成するアルミニウム管本体材料には、従来から押出加工による扁平多穴管の製造に用いられているアルミニウム材料がそのまま用いられ得るものであって、例えば、ＪＩＳ称呼のＡ１０００系純アルミニウム材料や、Ａ３０００系アルミニウム合金材料等を用いることが出来、更には、そのようなアルミニウム材料に、電位を貴にするため、合金成分としてＣｕが所定量（例えば、０．１～０．７質量％程度）含有せしめられていてもよい。また、犠牲陽極部１８を与える犠牲陽極材料には、上記の管本体材料よりも電気化学的に卑となる、換言すれば自然電位が卑となる、公知のアルミニウム合金材料が用いられ、例えば、合金成分としてＺｎを所定量、一般に０．１～１０質量％程度含むアルミニウム合金等が用いられることとなる。 By the way, in such a flat multi-hole tube 10, the aluminum tube main body material which comprises the circumference | surroundings of the flow path 12 containing the internal partition part 16 located between the adjacent flow paths 12 and 12 is conventionally used by extrusion process. Aluminum materials used in the production of flat multi-hole tubes can be used as they are, and for example, JIS-named A1000 series pure aluminum materials, A3000 series aluminum alloy materials, etc. can be used. In order to make the electric potential noble in such an aluminum material, a predetermined amount (for example, about 0.1 to 0.7 mass%) of Cu may be contained as an alloy component. Further, as the sacrificial anode material for providing the sacrificial anode portion 18, a known aluminum alloy material that is electrochemically lower than the above-described tube body material, in other words, has a lower natural potential, is used. As the alloy component, an aluminum alloy containing a predetermined amount of Zn, generally about 0.1 to 10% by mass, or the like is used.
　そして、上述の如き本発明に従う扁平多穴管１０は、押出加工されるアルミニウム材料として、上記した管本体材料と犠牲陽極材料とを用い、それら材料を、ポートホールダイスから同時押出加工することによって、製造されるものであるが、それら管本体材料と犠牲陽極材料とは、一般に、芯鞘構造の複合ビレットとして用いられることとなる。具体的には、犠牲陽極材料の内部（中心部）に設けた空洞部に、例えば矩形形状（角部が曲線状のものを含む）、円形、長円形、楕円形、長円形と楕円形との組合せ、多角形などの、該空洞部に対応した断面形状を有すると共に、断面寸法を最適化した管本体材料を配置せしめて、それらを溶接等によって接合して、一体化することにより、管本体材料からなる芯部分の周りに、犠牲陽極材料からなる鞘部分が一体的に形成されてなる構造の複合ビレットが、用いられるのである。 The flat multi-hole tube 10 according to the present invention as described above uses the above-described tube body material and sacrificial anode material as the aluminum material to be extruded, and simultaneously extrudes these materials from the port hole die. However, the tube body material and the sacrificial anode material are generally used as a composite billet having a core-sheath structure. Specifically, in the hollow portion provided in the sacrificial anode material (center portion), for example, a rectangular shape (including a curved corner portion), a circle, an oval, an ellipse, an oval and an oval A pipe body material having a cross-sectional shape corresponding to the hollow portion, such as a combination of polygons and the like, and having a cross-sectional dimension optimized, and joining and integrating them by welding or the like, thereby A composite billet having a structure in which a sheath portion made of a sacrificial anode material is integrally formed around a core portion made of a main body material is used.
　なお、このような複合ビレットの製造には、公知の各種の手段が採用され得、例えば、犠牲陽極材料からなるビレットの中心部に所定大きさの貫通孔を設けて鞘ビレットを形成し、そしてその貫通孔内に管本体材料からなる芯ビレットを挿入して、一体化せしめる手法の他、そのような鞘ビレットを二つ割りにした形態において作製し、そしてそれら二つ割りの鞘ビレットの空所に、芯ビレットを配置した形態において、全体を溶接等により固定して、一体化せしめる手法等によって、目的とする複合ビレットを形成することが可能である。 In addition, various known means can be adopted for the production of such a composite billet, for example, a sheath billet is formed by providing a through-hole of a predetermined size at the center of a billet made of a sacrificial anode material, and In addition to the method of inserting and integrating the core billet made of the tube body material into the through hole, such a sheath billet is produced in the form of being divided into two, and the core is formed in the space of the two divided billets. In the form in which the billet is arranged, it is possible to form the target composite billet by a method of fixing the whole by welding or the like and integrating them.
　また、かかる複合ビレットには、従来の押出扁平多穴管の製造の場合と同様な、複数の押出口を有するダイス、所謂ポートホールダイスを用いて、熱間押出加工する手法が適用され、これによって、目的とする押出扁平多穴管を得ることが出来ることとなるのであるが、その際、扁平多穴管の複数の流路に対応するように配設された長手の押出口を有するダイスに対して、複合ビレットの内部に配置せしめられた管本体材料の所定の断面形状における長手方向が、かかるダイスの押出口の長手方向と一致するように、当該複合ビレットを配置して、熱間押出加工が実施されるのである。このような複合ビレットのポートホールダイスに対する押出形態の採用により、得られる扁平多穴管の扁平形状の外周部に位置する管周長に亘り、複合ビレットの外面に配置された犠牲陽極材料を効果的に配分せしめ得て、犠牲陽極部を管周壁部の管外周面に有利に露出せしめ得ることとなる。 In addition, a method of hot extrusion using a die having a plurality of extrusion ports, a so-called porthole die, is applied to such a composite billet as in the case of manufacturing a conventional extruded flat multi-hole tube. Thus, the target extruded flat multi-hole tube can be obtained. At this time, a die having a long extrusion port arranged to correspond to a plurality of flow paths of the flat multi-hole tube On the other hand, the composite billet is arranged so that the longitudinal direction in the predetermined cross-sectional shape of the tube body material arranged inside the composite billet coincides with the longitudinal direction of the extrusion port of the die, Extrusion is performed. By adopting the extrusion form for the port hole die of such a composite billet, the sacrificial anode material arranged on the outer surface of the composite billet is effective over the circumference of the flat shape of the resulting flat multi-hole tube. Therefore, the sacrificial anode part can be advantageously exposed to the pipe outer peripheral surface of the pipe peripheral wall part.
　ところで、上述の如き本発明に従うアルミニウム押出扁平多穴管は、熱交換器における冷媒流路部材として、好適に用いられ得るものである。そして、本発明に従うアルミニウム押出扁平多穴管を冷媒通路管として用いる場合においては、例えば、互いに間隔を置いて配置された一対のアルミニウム製ヘッダータンクと、両ヘッダータンク間に、幅方向を通風方向に平行に向けた状態で、ヘッダータンクの長手方向に間隔を置いて互いに平行に配列され、かつ両端部が両ヘッダータンクに接続された複数のアルミニウム押出扁平多穴管と、隣り合う扁平多穴管同士の間及び両端の扁平多穴管の外側に配置されて、それら扁平多穴管にろう付け固定された、アウターフィンであるアルミニウム製コルゲート状フィンと、両端のコルゲート状フィンの外側に配置されて、かかるフィンにろう付けされたアルミニウム製サイドプレートとを備えてなる構造において、熱交換器が構成されることとなるが、勿論、そのような構造の熱交換器の他にも、公知の各種の熱交換器における冷媒通路管として、本発明に従うアルミニウム押出扁平多穴管を用いることが出来ることは、言うまでもないところである。 Incidentally, the aluminum extruded flat multi-hole tube according to the present invention as described above can be suitably used as a refrigerant flow path member in a heat exchanger. And when using the aluminum extrusion flat multi-hole pipe according to the present invention as a refrigerant passage pipe, for example, a pair of aluminum header tanks arranged at a distance from each other, and a width direction ventilation direction between both header tanks And a plurality of extruded aluminum flat multi-hole tubes arranged in parallel with each other at intervals in the longitudinal direction of the header tank and connected to both header tanks, and adjacent flat multi-holes Aluminum corrugated fins, outer fins, placed between the tubes and outside the flat multi-hole tubes at both ends and brazed to the flat multi-hole tubes, and arranged outside the corrugated fins at both ends The heat exchanger is constructed in a structure comprising an aluminum side plate brazed to such fins. Of course, in addition to the heat exchanger having such a structure, it is needless to say that the aluminum extruded flat multi-hole pipe according to the present invention can be used as a refrigerant passage pipe in various known heat exchangers. That's where it is.
　なお、よく知られているように、熱交換器における一対のヘッダータンクは、一方のヘッダータンクから扁平多穴管に冷媒若しくは冷却液を分配して流入させると共に、他方のヘッダータンクは、扁平多穴管から流出した冷媒若しくは冷却液を集合させるようにしたものであって、例えば、公知の如く、ヘッダープレートとヘッダープレートとを対向してろう付けしたものや、板を管状に曲げ成形して、その管状とされたものの合わせ部を溶接又はろう付けして構成されたものの他、管状に押し出された押出管等が、用いられることとなる。 As is well known, a pair of header tanks in a heat exchanger distributes and flows refrigerant or coolant from one header tank to a flat multi-hole tube, and the other header tank is flat flat. The coolant or coolant that has flowed out of the hole tube is gathered. For example, as is known, the header plate and the header plate are brazed oppositely, or the plate is bent into a tubular shape. In addition to the one formed by welding or brazing the joining portion of the tubular shape, an extruded tube extruded into a tubular shape or the like is used.
　以上、本発明の代表的な実施形態について詳述してきたが、それは、あくまでも例示に過ぎないものであって、本発明は、そのような実施形態に係る具体的な記述によって何等限定的に解釈されるものではないことが、理解されるべきである。 The exemplary embodiments of the present invention have been described in detail above, but these are merely examples, and the present invention is interpreted in a limited manner by specific descriptions according to such embodiments. It should be understood that it is not done.
　そして、本発明が、当業者の知識に基づいて、種々なる変更、修正、改良等を加えた態様において実施され得るものであり、またそのような実施の態様が、本発明の趣旨を逸脱しない限りにおいて、何れも、本発明の範疇に属するものであることは、言うまでもないところである。 And this invention can be implemented in the aspect which added various change, correction, improvement, etc. based on the knowledge of those skilled in the art, and such an aspect does not deviate from the meaning of this invention. Needless to say, all of them belong to the category of the present invention.
　以下に、本発明の代表的な実施例を示し、本発明を更に具体的に明らかにすることとするが、本発明が、そのような実施例の記載によって、何等の制約をも受けるものでないことも、また、理解されるべきである。 Hereinafter, representative examples of the present invention will be shown to clarify the present invention more specifically, but the present invention is not limited by the description of such examples. That should also be understood.
　下記表１に示される成分組成（％：質量基準）を有する管本体材料と犠牲陽極材料からなる複合ビレットａ～ｈ及びｊを製作し、それらの熱間押出加工によって、それぞれ、扁平多穴管Ａ～Ｈ及びＪを得た。また、下記表１に示される成分組成の単体ビレットｉを製作し、その熱間押出加工によって、扁平多穴管Ｉを得た。そして、それら得られた扁平多穴管Ａ～Ｊを用いて、以下の（１）犠牲陽極部の形成範囲の測定、（２）電位測定、及び（３）外面防食性評価を実施した。 Composite billets a to h and j made of a tube body material and a sacrificial anode material having the component composition (%: mass basis) shown in Table 1 below are manufactured, and each of them is a flat multi-hole tube by hot extrusion. A to H and J were obtained. Moreover, the single billet i of the component composition shown in following Table 1 was manufactured, and the flat multi-hole pipe I was obtained by the hot extrusion process. Then, using the obtained flat multi-hole tubes A to J, the following (1) measurement of the formation range of the sacrificial anode part, (2) potential measurement, and (3) evaluation of the outer surface anticorrosion property were performed.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　具体的には、先ず、かかる表１に示される複合ビレットａ～ｈ及びｊにおける管本体材料用成分を用いて、常法に従って、ＤＣ鋳造により、９０ｍｍφの各種の管本体用ビレットをそれぞれ作製した。一方、上記表１に示される複合ビレットａ～ｈ及びｊにおける犠牲陽極材料用成分を用いて同様に作製した犠牲陽極用ビレットを、円形の寸法が５ｍｍ～８５ｍｍの範囲内において種々組み合せて、所定の寸法に成形・加工した。そして、前記犠牲陽極用ビレットの断面中央部に、かかる加工済みの管本体材料用ビレットを挿入し得る貫通孔を形成せしめて、その貫通孔内に、管本体用ビレットを嵌入し、更にそれら管本体用ビレットと犠牲陽極用ビレットとを、それらの長手方向両端面において、ＭＩＧ溶接により固定・接合せしめて、それぞれの複合ビレットａ～ｈ及びｊを、図２に示される如き断面形態を有する、一体的な複合ビレット２０として、作製した。また、上記表１に示される管本体材料用成分からなる単体ビレットｉを作製した。この管本体材料用成分からなる単体ビレットｉは、犠牲陽極用ビレットを用いていない従来材と同様な、図３において、３０として示される単体ビレットである。なお、図２、３において、２２及び３２は、管本体用ビレットであり、２４は犠牲陽極用ビレットである。 Specifically, first, various pipe body billets of 90 mmφ were produced by DC casting in accordance with a conventional method using the components for the pipe body materials in the composite billets a to h and j shown in Table 1. . On the other hand, sacrificial anode billets prepared in the same manner using the components for sacrificial anode materials in the composite billets a to h and j shown in Table 1 above are variously combined in a circular dimension within the range of 5 mm to 85 mm to obtain a predetermined number. Molded and processed to the dimensions of Then, a through hole into which the processed tube body material billet can be inserted is formed in the central portion of the cross section of the sacrificial anode billet, and the tube body billet is inserted into the through hole, and the tubes are further inserted. The main body billet and the sacrificial anode billet are fixed and joined to each other in the longitudinal direction by MIG welding, and each composite billet ah and j has a cross-sectional shape as shown in FIG. It was produced as an integral composite billet 20. Moreover, the simple billet i which consists of a pipe | tube main body component shown by the said Table 1 was produced. The single billet i made of the tube body material component is a single billet shown as 30 in FIG. 3, which is the same as the conventional material not using the sacrificial anode billet. In FIGS. 2 and 3, reference numerals 22 and 32 denote tube body billets, and reference numeral 24 denotes a sacrificial anode billet.
　次いで、かかる得られた複合ビレット２０又は単体ビレット３０を、ビレットヒータにて５００℃まで加熱した後、８穴の矩形穴（８個の流路）を形成するための押出口を備えた、従来と同様なポートホールダイスを用いて、熱間押出加工することにより、図１に示される如き８穴の扁平多穴管Ａ～Ｈ及びＩ～Ｊ（全体厚さ：２．０ｍｍ、扁平方向の幅：１６ｍｍ、管周壁部及び内部隔壁部の肉厚：０．２５ｍｍ）を、それぞれ製造した。 Subsequently, the composite billet 20 or the single billet 30 thus obtained is heated to 500 ° C. with a billet heater, and then provided with an extrusion port for forming eight rectangular holes (eight flow paths). By using a port hole die similar to that shown in FIG. 1 to perform hot extrusion processing, 8-hole flat multi-hole tubes A to H and I to J (overall thickness: 2.0 mm, flat direction) as shown in FIG. Width: 16 mm, pipe peripheral wall portion and inner partition wall thickness: 0.25 mm), respectively.
（１）犠牲陽極部の形成範囲の測定
　かくして得られた８穴の各種の扁平多穴管（１０）について、それらを押出長手方向の１／２の位置でそれぞれ切断して、その断面を観察した。即ち、かかる断面のミクロ組織を倍率２５倍で撮影した写真を用いて、その犠牲陽極部（１８）の領域を物差しで計測することにより、犠牲陽極部（１８）の形成範囲を測定した。そして、このような犠牲陽極部（１８）の形成範囲の測定において、犠牲陽極部（１８）の厚さ（最大厚さ）が、管周壁部（１４）の厚さの９０％以下である場合は（〇）とし、９０％を超える場合は（×）として、評価した。更に、管周壁部（１４）の管外周長（Ｌ）に対する犠牲陽極部（１８）の露呈部位の長さの割合（扁平多穴管の外周面に犠牲陽極材料部（１８）が形成された範囲の合計長さ）が５０％以上である場合は（〇）とし、管外周長（Ｌ）が０％以上、５０％未満である場合は（×）として、評価した。下記の表２には、扁平多穴管Ａ～Ｈ及び扁平多穴管Ｉ及びＪについて、上記の犠牲陽極部（１８）の形成範囲を測定した結果が、管周壁部（１４）の厚さに対する犠牲陽極部（１８）の最大厚さとなる部位の比率及び管外周長（Ｌ）に対する犠牲陽極部（１８）の合計長さの割合において、示されている。 (1) Measurement of the formation range of the sacrificial anode part About the various flat multi-hole pipes (10) of 8 holes thus obtained, they were cut at a half position in the longitudinal direction of the extrusion, and the cross section was observed. did. That is, the formation range of the sacrificial anode part (18) was measured by measuring the area of the sacrificial anode part (18) with a ruler using a photograph taken of the microstructure of the cross section at a magnification of 25 times. In the measurement of the formation range of the sacrificial anode part (18), the thickness (maximum thickness) of the sacrificial anode part (18) is 90% or less of the thickness of the pipe peripheral wall part (14). Was evaluated as (◯), and when it exceeded 90%, it was evaluated as (×). Furthermore, the ratio of the length of the exposed portion of the sacrificial anode portion (18) to the tube outer peripheral length (L) of the tube peripheral wall portion (14) (the sacrificial anode material portion (18) was formed on the outer peripheral surface of the flat multi-hole tube) When the total length of the range was 50% or more, it was evaluated as (◯), and when the pipe outer peripheral length (L) was 0% or more and less than 50%, it was evaluated as (x). Table 2 below shows the results of measuring the formation range of the sacrificial anode part (18) for the flat multi-hole pipes A to H and the flat multi-hole pipes I and J, and the thickness of the pipe peripheral wall part (14). The ratio of the portion of the sacrificial anode part (18) with respect to the maximum thickness and the ratio of the total length of the sacrificial anode part (18) to the outer circumferential length (L) are shown.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　かかる断面観察の結果、上記の押出加工によって得られた扁平多穴管Ａ～Ｈにおいては、管周壁部（１４）に形成される犠牲陽極部（１８）の厚さは、何れも、最も厚い部位で、管周壁部（１４）の厚さの８０％以下であり、更に、そのような扁平多穴管（１０）の管外周長（Ｌ）に対して、５０％を超える長さ範囲において、犠牲陽極部（１８）が露呈されていることが認められた。 As a result of the cross-sectional observation, in the flat multi-hole tubes A to H obtained by the above-described extrusion process, the thickness of the sacrificial anode portion (18) formed on the tube peripheral wall portion (14) is the thickest. In the region, it is 80% or less of the thickness of the pipe peripheral wall (14), and more than 50% of the pipe outer peripheral length (L) of such a flat multi-hole pipe (10). It was observed that the sacrificial anode part (18) was exposed.
　また、このように熱間押出して得られた扁平多穴管（１０）にあっては、その押出長手方向において、犠牲陽極用ビレットにて形成される犠牲陽極部（１８）が、管周壁部（１４）の管外周部に安定して露呈せしめられていることも、確認された。 Further, in the flat multi-hole tube (10) obtained by hot extrusion in this way, the sacrificial anode portion (18) formed by the sacrificial anode billet in the longitudinal direction of the extrusion has a tube peripheral wall portion. It was also confirmed that (14) was stably exposed on the outer periphery of the tube.
　一方、ビレット組成ｉ（Ａｌ－０．４％Ｃｕ）からなる単体ビレット３０を用いて、ポートホールダイスによる熱間押出加工を実施して得られた扁平多穴管Ｉは、犠牲陽極用ビレットを用いていないため、犠牲陽極部１８の露呈部位は、管外周面に何等存在していなかった。また、管本体用ビレットとして、６０ｍｍ×６０ｍｍの正方形状に加工されたビレットを用いて作製された複合ビレットｊから得られた扁平多穴管Ｊにおいて、管周壁部（１４）に形成された犠牲陽極部（１８）の厚さは、最も厚い部位で、管周壁部（１４）の厚さの９３％となった。また、管外周長（Ｌ）に対する犠牲陽極部（１８）の合計長さの割合は、９０％となるものであった。 On the other hand, a flat multi-hole tube I obtained by carrying out hot extrusion using a porthole die using a single billet 30 composed of a billet composition i (Al-0.4% Cu) is a sacrificial anode billet. Since it was not used, no exposed portion of the sacrificial anode portion 18 was present on the outer peripheral surface of the tube. Moreover, in the flat multi-hole pipe J obtained from the composite billet j produced using the billet processed into a square shape of 60 mm × 60 mm as the pipe body billet, the sacrifice formed on the pipe peripheral wall portion (14) The thickness of the anode part (18) was 93% of the thickness of the pipe peripheral wall part (14) at the thickest part. Further, the ratio of the total length of the sacrificial anode portion (18) to the tube outer peripheral length (L) was 90%.
（２）電位測定
　上記で得られた、扁平多穴管Ａ～Ｈ及び扁平多穴管Ｉ及びＪを用いて、それぞれ、管本体材料と犠牲陽極材料の電位を測定した。なお、扁平多穴管Ｉは管本体材料のみで構成された単一ビレットから製造されており、犠牲陽極部（１８）は形成されていないものである。 (2) Potential measurement Using the flat multi-hole tubes A to H and the flat multi-hole tubes I and J obtained above, the potentials of the tube body material and the sacrificial anode material were measured. The flat multi-hole tube I is manufactured from a single billet made of only the tube body material, and the sacrificial anode portion (18) is not formed.
　具体的には、扁平多穴管Ａ～Ｈ及び扁平多穴管Ｉ及びＪに対して、それぞれ、それらが熱交換器における伝熱管として用いられる際の、フィン接合のためのろう付け加熱を想定して、６００℃×３分の加熱処理を施した後、それらを押出長手方向に４０ｍｍの長さでそれぞれ切断した。そして、管本体材料の電位を測定する供試材は、その扁平形状の長手方向（管軸に直角な方向）に延びる切断面において、厚さ１／２の位置で切断し、その半体の内表面側の幅方向中央部に１０ｍｍ×１０ｍｍの犠牲陽極部（１８）の露出面を残して、切断端面の片側に電位測定用のリード線を接続する部位を除く全てをシリコーン樹脂にてマスキングすることにより、電気的に絶縁した。また、犠牲陽極部（１８）（犠牲陽極材料）の電位を測定する供試材は、その周壁部の片側の外表面の幅方向中央部に１０ｍｍ×１０ｍｍの犠牲陽極材料の露出面を残し、切断端面の片側に電位測定用のリード線を接続する部位を除く全てをシリコーン樹脂にてマスキングすることにより、電気的に絶縁した。 Specifically, brazing heating for fin bonding is assumed for flat multi-hole tubes A to H and flat multi-hole tubes I and J, respectively, when they are used as heat transfer tubes in a heat exchanger. And after heat-processing 600 degreeC * 3 minutes, they were cut | disconnected by the length of 40 mm in the extrusion longitudinal direction, respectively. Then, the test material for measuring the potential of the tube body material is cut at a thickness of 1/2 on the cut surface extending in the longitudinal direction of the flat shape (direction perpendicular to the tube axis). Mask the entire surface with the silicone resin except for the part where the lead wire for potential measurement is connected to one side of the cut end face, leaving the exposed surface of the 10mm x 10mm sacrificial anode part (18) at the center in the width direction on the inner surface side. By electrically insulating. Further, the test material for measuring the potential of the sacrificial anode part (18) (sacrificial anode material) leaves an exposed surface of the sacrificial anode material of 10 mm × 10 mm at the center in the width direction of the outer surface on one side of the peripheral wall part, All the portions except for the portion where the potential measurement lead wire was connected to one side of the cut end face were masked with silicone resin to be electrically insulated.
　また、電位の測定方法としては、参照電極として、飽和ＫＣｌカロメル電極（ＳＣＥ：Saturated Calomel Electrode ）を用いる一方、試験溶液としては、酢酸にてｐＨ３に調整された５％ＮａＣｌ水溶液を用い、それを室温下にて撹拌しつつ、その溶液に供試材を２４ｈ浸漬した後、それぞれの電位を測定する方法を、採用した。 As a method for measuring the potential, a saturated KCl calomel electrode (SCE) is used as a reference electrode, while a 5% NaCl aqueous solution adjusted to pH 3 with acetic acid is used as a test solution. A method of measuring each potential after immersing the test material in the solution for 24 hours while stirring at room temperature was employed.
　そして、上記測定で得られた管本体材料と犠牲陽極材料との電位差の結果を、下記表３に示す。なお、かかる管本体材料と犠牲陽極材料との電位差が、５ｍＶ以上、３００ｍＶ以下の場合は（◎）とし、その電位差が０ｍＶを超え、５ｍＶ未満の場合及び３００ｍＶを超える場合は（〇）とし、０ｍＶの場合は（×）として、評価した。 The results of the potential difference between the tube body material and the sacrificial anode material obtained by the above measurement are shown in Table 3 below. In addition, when the potential difference between the tube body material and the sacrificial anode material is 5 mV or more and 300 mV or less, (◎), and when the potential difference exceeds 0 mV and less than 5 mV or exceeds 300 mV, (◯) In the case of 0 mV, it evaluated as (x).
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　かかる表３に示される電位測定結果より明らかな如く、扁平多穴管Ａ～Ｈの、想定されるろう付け加熱後における犠牲陽極部（１８）（犠牲陽極材料）と管本体材料との電位差は、３～３５０ｍＶであり、何れも、有効な犠牲陽極効果を有する結果を示すものであった。 As apparent from the potential measurement results shown in Table 3, the potential difference between the sacrificial anode portion (18) (sacrificial anode material) and the tube body material of the flat multi-hole tubes A to H after the assumed brazing heating is as follows. 3 to 350 mV, all showing results having an effective sacrificial anode effect.
　これに対して、扁平多穴管Ｉを供試材とした場合にあっては、当該扁平多穴管Ｉが、犠牲陽極材料を用いることなく、従来材と同様の、管本体材料のみで構成された扁平多穴管であるところから、その電位差は０ｍＶであった。 On the other hand, in the case where the flat multi-hole tube I is used as a test material, the flat multi-hole tube I is composed of only the tube main body material similar to the conventional material without using the sacrificial anode material. The potential difference was 0 mV because it was a flat multi-hole tube.
　また、扁平多穴管Ｊを供試材として、上記と同様な電位測定を行ったところ、当該扁平多穴管Ｊの、想定されるろう付け加熱後における犠牲陽極部（１８）（犠牲陽極材料）と管本体材料との電位差は１５０ｍＶとなり、犠牲陽極効果を有する結果となった。 Further, when the same potential measurement as described above was performed using the flat multi-hole tube J as a test material, the sacrificial anode portion (18) (sacrificial anode material) of the flat multi-hole tube J after the assumed brazing heating was performed. ) And the tube body material was 150 mV, which resulted in a sacrificial anode effect.
（３）外面防食性評価
　上記で得られた、扁平多穴管Ａ～Ｈと扁平多穴管Ｉ及びＪとを供試材として、それぞれ、ＡＳＴＭ－Ｇ８５－Ａｎｎｅｘ　Ａ３に規定されるＳＷＡＡＴ試験を実施し、それぞれの外面防食の効果を検証した。このＳＷＡＡＴ試験は、定温度（４９℃）条件下で、人工海水噴霧と湿潤環境を繰返して曝露負荷することによって、外面防食性を評価するものである。また、腐食試験期間は１０日、２０日及び３０日間の３水準の期間とし、貫通が無いものは（○）と評価し、貫通しているものを（×）と評価した。 (3) Evaluation of outer surface anticorrosion properties Using the obtained flat multi-hole tubes A to H and flat multi-hole tubes I and J as test materials, the SWAAT test specified in ASTM-G85-Annex A3 was performed, respectively. We carried out and verified effect of each outer surface corrosion prevention. This SWAAT test evaluates the outer surface anticorrosion property by repeatedly applying an artificial seawater spray and a wet environment under constant temperature (49 ° C.) conditions. In addition, the corrosion test period was a three-level period of 10 days, 20 days, and 30 days. A case where there was no penetration was evaluated as (◯), and a case where there was penetration was evaluated as (×).
　具体的には、扁平多穴管Ａ～Ｈ及び扁平多穴管Ｉ～Ｊに対して、それらが熱交換器における伝熱管として用いられる際の、フィン接合のためのろう付け加熱を想定して、６００℃×３分の加熱処理を施した後、それらを押出長手方向に１００ｍｍの長さで切断し、流路が露出した切断端面の両端をシリコーン樹脂にてマスキングした。また、ＳＷＡＡＴ試験に用いた試験液は、ＡＳＴＭ　Ｄ１１４１による人工海水を作製し、この人工海水に酢酸を添加してｐＨ３に調整した。また、試験条件は０．５時間噴霧－湿潤１．５時間を１サイクルとし、このサイクルを繰り返し、１０日、２０日及び３０日の３水準の期間での外面防食性の評価試験を実施した。 Specifically, brazing heating for fin bonding is assumed for flat multi-hole tubes A to H and flat multi-hole tubes I to J when they are used as heat transfer tubes in a heat exchanger. After heat treatment at 600 ° C. for 3 minutes, they were cut to a length of 100 mm in the longitudinal direction of extrusion, and both ends of the cut end face where the flow channel was exposed were masked with silicone resin. Moreover, the test liquid used for the SWAAT test produced the artificial seawater by ASTM D1141, and added acetic acid to this artificial seawater, and adjusted it to pH3. In addition, the test condition was 0.5 hour spray-wet 1.5 hour as one cycle, and this cycle was repeated, and the outer surface anticorrosion evaluation test was conducted for three levels of 10 days, 20 days, and 30 days. .
　そして、かかる外面防食性の評価試験の終了した供試材に対しては、両端部のシリコーンシーラント樹脂を剥離した後、ヒータで昇温したリン酸クロム酸液に投入して、供試材表面の腐食生成物を除去して、供試材表面における貫通孔の有無を調べた。具体的には、扁平多穴管のそれぞれの流路に、浸透性の高い着色された探傷液を滴下し、扁平多穴管の内面からその探傷液の染み出しを確認する方法により貫通孔の有無を調べた。更に、その貫通孔を調べた供試材を、埋め込み樹脂で埋包した後、最大腐食部に対して耐水ペーパーによる断面出しを施し、更にバフ研磨にて鏡面仕上げすることにより、それぞれの供試材の管外周面の腐食状況を観察した。なお、上記試験で使用された供試材のＳＷＡＡＴ試験において、２０日後では貫通は発生せず、３０日後に貫通が認められた場合或いは未貫通の場合は（◎）とし、１０日後では貫通は発生せず、２０日後に貫通が認められた場合は（○）とし、１０日後に貫通が認められた場合を（×）として、評価した。 Then, for the test material for which the outer surface anticorrosion evaluation test was completed, after peeling the silicone sealant resin at both ends, the test material surface was put into a phosphoric acid chromic acid solution heated by a heater. The corrosion product was removed, and the presence or absence of through-holes on the surface of the test material was examined. Specifically, a highly penetrable colored flaw detection liquid is dropped into each flow path of the flat multi-hole tube, and the penetration hole is confirmed by a method of confirming the exudation of the flaw detection liquid from the inner surface of the flat multi-hole pipe. The presence or absence was examined. Furthermore, after embedding the test material whose through-holes were embedded with embedding resin, the cross-section was made with water-resistant paper for the maximum corroded part, and further mirror-finished by buffing. The corrosion situation of the pipe outer peripheral surface of the material was observed. In the SWAAT test of the test material used in the above test, penetration did not occur after 20 days, and if penetration was observed after 30 days or not penetrated (◎), penetration after 10 days. When it did not occur and penetration was observed after 20 days, it was evaluated as (◯), and when penetration was observed after 10 days, it was evaluated as (x).
　以下の表４には、扁平多穴管Ａ～Ｈ及び扁平多穴管Ｉ～Ｊについて、上記のＳＷＡＡＴ試験を１０、２０、及び３０日間実施して評価した結果が、それぞれ示されている。 Table 4 below shows the results of evaluating the flat multi-hole tubes A to H and flat multi-hole tubes I to J by performing the above SWAAT test for 10, 20, and 30 days, respectively.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
　かかる表４の結果より明らかな如く、扁平多穴管Ａ～Ｈは、ＳＷＡＡＴ試験の１０日後の評価において、管周壁部を貫通する貫通孔が生じていないことが認められた。また、２０日後の評価においては、扁平多穴管Ｂ、Ｃ、Ｆ、Ｈにおいて、管周壁部を貫通する貫通孔が確認された。更に、３０日後の評価においては、Ｂ、Ｃ、Ｆ、Ｈ以外の何れの扁平多穴管にも、貫通孔は認められなかった。従って、扁平多穴管Ａ～Ｈは、何れも、犠牲陽極部（１８）の存在による犠牲陽極効果によって、有効な外面防食が施されていることが、認められた。 As apparent from the results in Table 4, it was confirmed that the flat multi-hole tubes A to H had no through-holes penetrating the peripheral wall portion in the evaluation after 10 days of the SWAAT test. Further, in the evaluation after 20 days, in the flat multi-hole tubes B, C, F, and H, a through-hole penetrating the tube peripheral wall portion was confirmed. Furthermore, in the evaluation after 30 days, no through hole was observed in any flat multi-hole tube other than B, C, F, and H. Therefore, it was recognized that all of the flat multi-hole tubes A to H are effectively protected from the outer surface by the sacrificial anode effect due to the presence of the sacrificial anode portion (18).
　これに対して、扁平多穴管Ｉは、犠牲陽極材料を用いることなく、従来材と同様の管本体材料のみを用いた扁平多穴管であるため、ＳＷＡＡＴ試験を１０、２０、及び３０日間実施したところ、全ての試験後の評価において、管周壁部を貫通する腐食孔が生じていることが、認められた。これは、本発明に係る扁平多穴管の如く、犠牲陽極部（１８）が管外周部に存在しないために、犠牲陽極効果が得られず、外面防食効果が発揮され得なかったことにより、早期に貫通が生じたものと認められた。 On the other hand, the flat multi-hole tube I is a flat multi-hole tube using only the tube main body material similar to the conventional material without using the sacrificial anode material, and therefore the SWAAT test is performed for 10, 20, and 30 days. As a result, it was confirmed that corrosion holes penetrating the pipe peripheral wall portion were generated in all the evaluations after the test. This is because, like the flat multi-hole tube according to the present invention, the sacrificial anode portion (18) does not exist on the outer peripheral portion of the tube, so the sacrificial anode effect cannot be obtained and the outer surface anticorrosive effect cannot be exhibited. It was recognized that penetration had occurred early.
　また、扁平多穴管Ｊは、上記と同様なＳＷＡＡＴ試験を１０、２０、及び３０日間実施したところ、全ての試験後の評価において、管周壁部を貫通する腐食孔が生じていることが認められた。この貫通部は、何れも、犠牲陽極部（１８）が９０％を超えて形成されている部位であり、かかる犠牲陽極部（１８）に含有されるＺｎが、ろう付け加熱に相当する加熱処理時に管周壁部（１４）全体に拡散してしまい、その結果、犠牲陽極部（１８）が早期に消耗したために、早期に貫通が生じたものと認められた。 In addition, when the flat multi-hole tube J was subjected to the SWAAT test similar to the above for 10, 20, and 30 days, it was found that in all the evaluations after the test, corrosion holes penetrating the peripheral wall portion were formed. It was. Each of the penetrating portions is a portion where the sacrificial anode portion (18) is formed to exceed 90%, and the Zn contained in the sacrificial anode portion (18) is heat treatment corresponding to brazing heating. Occasionally, it diffused throughout the pipe wall (14), and as a result, the sacrificial anode part (18) was consumed at an early stage, and it was recognized that penetration occurred early.
　１０　扁平多穴管　　　　　１２　流路（空孔）
　１４　管周壁部　　　　　　１６　内部隔壁部
　１８　犠牲陽極部　　　　　２０　複合ビレット
　２２　管本体ビレット　　　２４　犠牲陽極ビレット
　３０　単体ビレット　　　　３２　管本体ビレット 10 flat multi-hole tube 12 flow path (hole)
14 Pipe peripheral wall part 16 Internal partition part 18 Sacrificial anode part 20 Composite billet 22 Pipe body billet 24 Sacrificial anode billet 30 Single billet 32 Pipe body billet

Claims (10)

  1. 　アルミニウム材料の押出加工によって得られた、全体として扁平な横断面形状を呈する押出管であって、互いに独立して管軸方向に平行に延びる複数の流路を有し、且つそれら流路が、管軸方向に延びる内部隔壁部を介して、扁平形状の長手方向に配列せしめられているアルミニウム押出扁平多穴管にして、
    　前記アルミニウム材料としてアルミニウム管本体材料とこのアルミニウム管本体材料よりも電気化学的に卑なアルミニウム犠牲陽極材料とを用いた押出加工によって形成されていると共に、管外周面の全域に、又は少なくとも管外周面における平坦部の一部に、前記アルミニウム犠牲陽極材料が露呈せしめられて、犠牲陽極部が形成されていることを特徴とする外面防食性に優れたアルミニウム押出扁平多穴管。     An extruded tube having a flat cross-sectional shape as a whole obtained by extrusion of an aluminum material, and having a plurality of channels extending in parallel to the tube axis direction independently of each other, and these channels are An aluminum extruded flat multi-hole tube arranged in the longitudinal direction of a flat shape through an internal partition extending in the tube axis direction,
    The aluminum material is formed by extrusion using an aluminum tube main body material and an aluminum sacrificial anode material that is electrochemically less basic than the aluminum tube main body material, and at least the outer periphery of the tube An aluminum extruded flat multi-hole tube excellent in corrosion resistance on the outer surface, wherein the sacrificial anode part is formed by exposing the aluminum sacrificial anode material to a part of a flat part on the surface.
  2. 　管横断面における前記内部隔壁部以外の管周壁部において、前記犠牲陽極部が、該管周壁部の厚さの９０％以下の割合で存在せしめられている請求項１に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 2. The outer surface anticorrosive property according to claim 1, wherein the sacrificial anode part is present at a ratio of 90% or less of the thickness of the pipe peripheral wall part in the pipe peripheral wall part other than the inner partition wall part in the pipe cross section. Excellent aluminum extruded flat multi-hole tube.
  3. 　前記犠牲陽極部が、管横断面において、前記管外周面の周長の５０％以上、１００％以下の割合で存在せしめられている請求項１又は請求項２に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 The said sacrificial anode part was excellent in the outer surface anticorrosive property of Claim 1 or Claim 2 made to exist in the ratio of 50% or more of the circumference of the said pipe | tube outer peripheral surface in a pipe cross section, and 100% or less. Aluminum extruded flat multi-hole tube.
  4. 　前記アルミニウム犠牲陽極材料と前記アルミニウム管本体材料との電位差は、５ｍＶ以上、３００ｍＶ以下であることを特徴とする請求項１乃至請求項３の何れか１項に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 4. The aluminum having excellent outer surface anticorrosion properties according to claim 1, wherein a potential difference between the aluminum sacrificial anode material and the aluminum tube main body material is 5 mV or more and 300 mV or less. 5. Extruded flat multi-hole tube.
  5. 　前記押出加工されるアルミニウム材料が、前記アルミニウム管本体材料と前記アルミニウム犠牲陽極材料とから構成される複合ビレットである請求項１乃至請求項４の何れか１項に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 The outer surface anticorrosive property according to any one of claims 1 to 4, wherein the extruded aluminum material is a composite billet composed of the aluminum tube main body material and the aluminum sacrificial anode material. Aluminum extruded flat multi-hole tube.
  6. 　前記複合ビレットが、前記アルミニウム管本体材料からなる芯ビレットと、該芯ビレットの周囲に位置する、前記アルミニウム犠牲陽極材料からなる鞘ビレットとからなる一体的な芯鞘構造を有している請求項５に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 The composite billet has an integral core-sheath structure comprising a core billet made of the aluminum tube main body material and a sheath billet made of the aluminum sacrificial anode material, which is located around the core billet. 5. An aluminum extruded flat multi-hole tube having excellent outer surface anticorrosion properties according to 5.
  7. 　前記押出管が、ポートホールダイスを用いた前記アルミニウム材料の押出加工によって形成されている請求項１乃至請求項６の何れか１項に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 The aluminum extruded flat multi-hole tube excellent in outer surface anticorrosion property according to any one of claims 1 to 6, wherein the extruded tube is formed by extruding the aluminum material using a porthole die.
  8. 　前記アルミニウム管本体材料が、ＪＩＳ称呼のＡ１０００系純アルミニウム材料又はＡ３０００系アルミニウム合金材料である請求項１乃至請求項７の何れか１項に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 The aluminum extruded flat multi-hole tube excellent in outer surface anticorrosion property according to any one of claims 1 to 7, wherein the aluminum tube main body material is an A1000 series pure aluminum material or an A3000 series aluminum alloy material of JIS name. .
  9. 　前記アルミニウム犠牲陽極材料が、Ｚｎを含有するアルミニウム合金材料である請求項１乃至請求項８の何れか１項に記載の外面防食性に優れたアルミニウム押出扁平多穴管。 The aluminum extruded flat multi-hole tube having excellent outer surface anticorrosion properties according to any one of claims 1 to 8, wherein the aluminum sacrificial anode material is an aluminum alloy material containing Zn.
  10. 　請求項１乃至請求項９の何れか１項に記載のアルミニウム押出扁平多穴管と、該アルミニウム押出扁平多穴管の外面にろう付け接合されたアルミニウム製アウターフィンとを含んで構成されていることを特徴とするアルミニウム製熱交換器。 An aluminum extruded flat multi-hole tube according to any one of claims 1 to 9, and an aluminum outer fin brazed to the outer surface of the aluminum extruded flat multi-hole tube. An aluminum heat exchanger characterized by that.
PCT/JP2018/004301 2017-02-13 2018-02-08 Aluminum extruded flat perforated pipe exhibiting excellent outer surface corrosion resistance, and aluminum heat exchanger obtained using same WO2018147348A1 (en)

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JPH05164496A (en) * 1991-12-17 1993-06-29 Tokyo Gas Co Ltd Fin tube for open rack type carburetor
JPH06142755A (en) * 1992-11-05 1994-05-24 Nippondenso Co Ltd Die for extruding multi-hole pipe and multi-hole pipe manufactured by using this die for extruding multi-hole pipe
US20060118282A1 (en) * 2004-12-03 2006-06-08 Baolute Ren Heat exchanger tubing by continuous extrusion
WO2009020171A1 (en) * 2007-08-07 2009-02-12 Showa Denko K.K. Process for producing member for heat exchanger and member for heat exchanger
WO2017026510A1 (en) * 2015-08-11 2017-02-16 株式会社Uacj Aluminum extruded flat perforated pipe having excellent internal surface anticorrosion property and aluminum heat exchanger using same

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JP2012007872A (en) * 2010-05-24 2012-01-12 Kobe Steel Ltd Multi-layered heat transfer tube, method for producing the multi-layered heat transfer tube, and molding tool used for the method
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JPH05164496A (en) * 1991-12-17 1993-06-29 Tokyo Gas Co Ltd Fin tube for open rack type carburetor
JPH06142755A (en) * 1992-11-05 1994-05-24 Nippondenso Co Ltd Die for extruding multi-hole pipe and multi-hole pipe manufactured by using this die for extruding multi-hole pipe
US20060118282A1 (en) * 2004-12-03 2006-06-08 Baolute Ren Heat exchanger tubing by continuous extrusion
WO2009020171A1 (en) * 2007-08-07 2009-02-12 Showa Denko K.K. Process for producing member for heat exchanger and member for heat exchanger
WO2017026510A1 (en) * 2015-08-11 2017-02-16 株式会社Uacj Aluminum extruded flat perforated pipe having excellent internal surface anticorrosion property and aluminum heat exchanger using same

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