WO2018147348A1 - Tuyau perforé plat extrudé en aluminium présentant une excellente propriété de résistance à la corrosion de surface externe, et échangeur thermique en aluminium utilisant ce tuyau - Google Patents

Tuyau perforé plat extrudé en aluminium présentant une excellente propriété de résistance à la corrosion de surface externe, et échangeur thermique en aluminium utilisant ce tuyau 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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English (en)
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/de
Priority to JP2018567476A priority patent/JPWO2018147348A1/ja
Priority to CN201880011537.4A priority patent/CN110290884A/zh
Publication of WO2018147348A1 publication Critical patent/WO2018147348A1/fr

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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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geometry (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Extrusion Of Metal (AREA)

Abstract

L'invention concerne un tuyau perforé plat extrudé en aluminium, dont la résistance de la surface circonférentielle externe à la corrosion est efficacement renforcée. Une section d'anode sacrificielle (18) est formée par exposition du matériau d'anode sacrificielle en aluminium sur toute la longueur (L) de la circonférence externe du tuyau, sur le côté surface externe d'une section de paroi circonférentielle du tuyau, ou sur au moins une partie de la section plate de celui-ci.
PCT/JP2018/004301 2017-02-13 2018-02-08 Tuyau perforé plat extrudé en aluminium présentant une excellente propriété de résistance à la corrosion de surface externe, et échangeur thermique en aluminium utilisant ce tuyau WO2018147348A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE112018000792.8T DE112018000792T5 (de) 2017-02-13 2018-02-08 Stranggepresste flache perforierte Aluminiumröhre mit hervorragenderAußenoberflächenkorrosionsbeständigkeit, und unter Verwendung davon erhaltenerAluminiumwärmetauscher
JP2018567476A JPWO2018147348A1 (ja) 2017-02-13 2018-02-08 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
CN201880011537.4A CN110290884A (zh) 2017-02-13 2018-02-08 外表面防腐蚀性优异的铝挤出扁平多孔管及使用其而成的铝制热交换器

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JP2017-023867 2017-02-13
JP2017023867 2017-02-13

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05164496A (ja) * 1991-12-17 1993-06-29 Tokyo Gas Co Ltd オープンラック型気化器用フィンチューブ
JPH06142755A (ja) * 1992-11-05 1994-05-24 Nippondenso Co Ltd 多穴管押出用ダイスおよびこの多穴管押出用ダイスを用いて製造された多穴管
US20060118282A1 (en) * 2004-12-03 2006-06-08 Baolute Ren Heat exchanger tubing by continuous extrusion
WO2009020171A1 (fr) * 2007-08-07 2009-02-12 Showa Denko K.K. Procédé de production d'un élément d'échangeur de chaleur et élément d'échangeur de chaleur
WO2017026510A1 (fr) * 2015-08-11 2017-02-16 株式会社Uacj Tuyau perforé plat extrudé en aluminium présentant une excellente propriété anticorrosion de surface interne et échangeur thermique en aluminium l'utilisant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012007872A (ja) * 2010-05-24 2012-01-12 Kobe Steel Ltd 複層伝熱管、複層伝熱管の製造方法、及びその製造方法に用いられる成形治具
CN103658216B (zh) * 2013-11-29 2016-03-09 中国船舶重工集团公司第七二五研究所 一种开架式气化器用铝合金翅片管挤压模具

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05164496A (ja) * 1991-12-17 1993-06-29 Tokyo Gas Co Ltd オープンラック型気化器用フィンチューブ
JPH06142755A (ja) * 1992-11-05 1994-05-24 Nippondenso Co Ltd 多穴管押出用ダイスおよびこの多穴管押出用ダイスを用いて製造された多穴管
US20060118282A1 (en) * 2004-12-03 2006-06-08 Baolute Ren Heat exchanger tubing by continuous extrusion
WO2009020171A1 (fr) * 2007-08-07 2009-02-12 Showa Denko K.K. Procédé de production d'un élément d'échangeur de chaleur et élément d'échangeur de chaleur
WO2017026510A1 (fr) * 2015-08-11 2017-02-16 株式会社Uacj Tuyau perforé plat extrudé en aluminium présentant une excellente propriété anticorrosion de surface interne et échangeur thermique en aluminium l'utilisant

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