CN106521386A - Galfan alloy double plating method for structural steel - Google Patents
Galfan alloy double plating method for structural steel Download PDFInfo
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- CN106521386A CN106521386A CN201611025212.0A CN201611025212A CN106521386A CN 106521386 A CN106521386 A CN 106521386A CN 201611025212 A CN201611025212 A CN 201611025212A CN 106521386 A CN106521386 A CN 106521386A
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- plating
- galfan
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- structural steel
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- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention belongs to the technical field of hot-dip galvanizing, and relates to a Galfan alloy double plating method for structural steel. The method comprises the following steps in sequence: degreasing; washing with water; pickling; washing with water; assisting plating; drying; preheating, and dip-plating pure zinc; hot-dipping Galfan alloy; and cooling. According to the method, a workpiece subjected to pre-treatment through a conventional batch hot-dip galvanizing method is subjected to dip-plating in a pure zinc bath under 430 to 470 DEG C for 1 to 30 seconds, and then subjected to dip-plating in parallel Galfan alloy bathes under 430 to 470 DEG C for 5 to 120 seconds; the obtained alloy coating is high in suface quality, uniform in thickness, and outstanding in mechanical performance; the corrosion resistance is 2 to 3 times that of a common pure zinc coating, so that the service life is long; the problems of silicon reactivity of the steel structure in the pure zinc hot-dip galvanizing and low quality of the surface of Galfan single-plated alloy coating can be overcome; an unstable plating assistant agent is avoided; the thickness of the coating can be reduced, the hot plating time is reduced, and the production cost is decreased under the premise that the service life of the workpiece is the same. The method is stable in technology, and easy to control the coating quality.
Description
Technical field
The invention belongs to hot-dip technical field, and in particular to a kind of method of the double plating Galfan alloys of structural steel.
Background technology
Galvanizing by dipping is a kind of effective steel surface protection method.Batch quantity hot dipping zinc is by surface cleaned, activation
Iron and steel afterwards is dipped in liquid Zn, generates ferrum zinc intermetallic compounds layer in steel surface by the Reaction-diffusion terms between ferrum zinc
Process.The pure zinc coating of hot-dip includes intermetallic compounds layer and free zinc layers, and it generates protective oxide film in atmosphere, every
From contact of the ferrous materials with corrosive environment, and the characteristic sacrificing positive pole of iron and steel protected using zinc, to ferrous materials
Play a protective role.But, silicon present in structural steel elements can produce pasc reaction in galvanizing by dipping, cause coating super thick,
Surface is gloomy, corrosion resistance is poor.
Galfan alloy is the new high corrosion-resistant alloy that a kind of composition is Zn-5%Al-RE, and its corrosion resistance is pure zinc coating
2～3 times.Aluminum is the determiner for improving resistance to corrosion, is eutectic structure when in coating, aluminium content is 5%, with splendid
Corrosion resistance and other combination properties, be the novel coating for substituting traditional pure zinc coating.The addition of trace rare-earth element,
Coating surface gloss not only can be effectively improved, corrosion resistance coating and machining property be improved, is increased the service life, may be used also
So that coating microstructure is uniform, crystal grain thinning, tiny eutectic structure can prevent the extension of crackle, so as to reduce coating fragility.And
And the fusing point of Galfan alloys is low, is more beneficial for energy-conservation.Which is in coastal state and area（Such as American-European and Japan and Korea S etc.）Obtain not
It is disconnected to promote.The process and its equipment of patent ZL 200410093932.1 invention steel wire overlay galfan alloy, China
Also standard GB/T/T20492-2006 has been formulated《- 5% aluminum of zinc-mixed rare earth alloy coating wire, steel strand wires》, and gradually push away
The wide coated article, is mainly used in metal gauze and bridge cable industry at present both at home and abroad.But, use conventional batch hot-dip
When zinc method carries out hot-dip Galfan alloy, as in alloy, the Al containing high level can be reacted with fluxing agent, lead
The problem for causing plating leakage, coating surface quality very poor.Although some scholars attempt the new fluxing agent of exploitation, such as patent CN both at home and abroad
105220099A and CN 105154804A individually disclose a kind of fluxing agent of batch hot dip Galfan and preparation method thereof.Specially
Sharp ZL 201310284192.9 is based on wire galvanization art inventions one kind double zinc-plated -10% aluminium-rare-earth Alloy Platings on steel wire
Layer process.But, structural steel zincincation is different from wire galvanization technique, and fluxing agent disclosed in these is unstable, it is difficult in knot
The Galfan alloy coating of excellent surface quality is obtained on structure steel part, therefore, not yet it is applied in structural steel coating.Pass through
The first pre- pure zinc plating immersion plating Galfan alloy again in structural steel elements, not only can effectively suppress pasc reaction during structural steel pure zinc plating
Property, it is to avoid using unstable fluxing agent, moreover it is possible to obtain the more preferable Galfan alloy coating of excellent surface quality, corrosion resistance, and
Improve coating microstructure, obtain excellent comprehensive mechanical performance.
There is presently no on structural steel the research report and publication of first pre- pure zinc plating immersion plating Galfan alloy again.
The content of the invention
This patent have studied immersion plating temperature, pre- pure zinc plating time and immersion plating Galfan alloy time to plating by contrast experiment
Layer tissue and corrosion proof impact, the double depositing process of optimization, the method for obtaining a kind of double plating Galfan alloys of structural steel.
The purpose of this patent is to provide a kind of structural steel double methods for plating Galfan alloy, structural steel elements Jing defats, water
Wash, pickling, wash, help plating, drying etc. to process after, in the pure zinc bath prior to 430～470 DEG C after 1～30 s of immersion plating, after taking-up,
Place into Galfan alloy bath 5～120 s of immersion plating of placed side by side 430～470 DEG C, last water-cooled.
The use of traditional zinc chloride and ammonia chloride water solution is fluxing agent when helping plating before plating.
In the Galfan alloy bath, the percentage by weight of Al content is 4～6%, the weight percent of mischmetal content
Than for 0.05～0.2%, balance of zinc.
When carrying out immersion plating to structural steel using the method for invention, without needing, using unstable fluxing agent, to obtain
Thickness of coating it is controllable, without the good Galfan alloy coating of pasc reaction, excellent surface quality, corrosion resistance.
In coating section structure with the method acquisition, near matrix is Fe2Al5Phase, outer layer are Galfan alloy liquid
There is Fe in solidified structure, centre2Al5With the mixed layer of liquid phase.
Beneficial effects of the present invention are：
（1）Present invention process is stable, quality of coating is easily controlled.Silicon during structural steel hot dipping pure zinc plating can be overcome using the method
Reactivity and the very poor problem of single-coated Galfan alloy coating surface quality, there is provided a kind of hot plating technology is simple, quality of coating is good
Galfan alloy coating method.
（2）In the case where same workpiece life conditions are obtained, it is possible to decrease thickness of coating, shorten the immersion plating time, reduction is produced into
This.
Description of the drawings
Fig. 1 is the technological process of double plating Galfan alloys of the present invention；
In Fig. 2 a, b be respectively Q195 steel in 450 DEG C of pure zinc after preplating 5 s and 10 s then at immersion plating in Galfan alloy 10
S surface topographies；
In Fig. 3 a, b, c, d be respectively Q195 steel in 450 DEG C of pure zinc after preplating 1s, 3 s, 5 s and 30 s then at Galfan
Coating microstructure in alloy baths after 10 s of immersion plating；
Fig. 4 is the single pure zinc plating of 450 DEG C of Q195 steel and double plating Galfan sample electrode curves；
In Fig. 5 a, b, c, d be respectively Q195 steel in 450 DEG C of pure zinc bath preplating 10s then at immersion plating 20 in Galfan alloy bath
Coating microstructure after s, 30 s, 60 s and 120 s；
In Fig. 6, a, b are respectively Q195 steel 10 s of preplating 10 s of immersion plating and 30 s Galfan alloys again in 430 DEG C of pure zinc bath
Coating microscopic structure.
Specific embodiment
Below with reference to specific embodiment and Figure of description, the preferred embodiments of the present invention are further described.
Preferred embodiment is of the invention only for explanation, rather than in order to limit the scope of the invention.
Embodiment 1
Pure zinc and Galfan alloy are respectively provided with by two first（Zn-5.0 wt.%Al-0.1wt.%RE）Crucible be put into well formula
450 DEG C are heated in stove and constant temperature is kept.
15%NaOH solution defat → washing → 10～15% hydrochloric acid of Q195 structural steel elements Jing removing surface → 70～90 DEG C
The weight ratio of the 200g/L of solution pickling → washing → 70～90 DEG C is 1.2：1 NH4Cl-ZnCl2Plating → drying is helped in aqueous solution
After process, preplating 1,2,3,5,10,20,30s in 450 DEG C of pure zinc bath is submerged initially in, 450 DEG C of Galfan conjunctions after taking-up, are placed in again
Immersion plating 10s in gold bath, finally takes out water-cooled.
The coating surface morphology for obtaining is as shown in Fig. 2 coating section structure is as shown in Figure 3.Coating after preplating 1s and 2s
Surface quality is relatively poor.Aborning, pre- more than pure zinc plating 5s is preferable.Scanned Electronic Speculum-energy spectrometer analysis find, near steel
The Fe to be dissolved with a certain amount of Zn of matrix2Al5ZnxPhase, solidified structure of the outer layer for Galfan alloy liquid, in the middle of this two-layer
For Fe2Al5ZnxWith the mixed layer of liquid phase.With the increase of preplating time, Fe2Al5ZnxSignificantly increase with the mixed layer thickness of liquid phase
Plus.The Fe of toughness is defined near steel matrix2Al5ZnxTransition zone instead of the δ phases of loose fragility, make the thickness of coating transition zone
Significantly thinning, the toughness of transition zone gets a promotion, and the adhesion of coating, toughness, antitorque folding endurance are better than galvanizing by dipping transition zone.
Electrochemical tests such as Fig. 4 institutes of the coating of pure zinc coating, the coating of preplating 3s+ immersion plating 10s and preplating 10s+ immersion plating 10s
Show.
As can be seen here, the corrosion resistance of double plating Galfan alloy coating is much better than pure zinc coating.
Embodiment 2
Essentially identical with embodiment 1, difference is：After the premenstrual process of Q195 steel, the first preplating in 450 DEG C of pure zinc bath
After 10 s, in 450 DEG C of Galfan alloy bath, 10 s, 20s, 30s and 60s of immersion plating then takes out water-cooled respectively.
The coating section structure for obtaining is as shown in Figure 5.It is found that after the preplating same time, with the immersion plating time
Prolongation, the Fe in coating2Al5ZnxLayer is substantially thickening, or even at away from matrix defines FeAl3Layer.Aborning, excessively
The prolongation immersion plating time does not have favorable influence to coating microstructure.
Embodiment 3
Essentially identical with embodiment 1, difference is：The temperature of zinc bath and the temperature of Galfan alloy bath are 430 DEG C.
After the premenstrual process of Q195 steel, first after 10 s of preplating in 430 DEG C of pure zinc bath, in 430 DEG C of Galfan alloy bath respectively
Immersion plating 10 s and 30s, then takes out water-cooled.
The coating microstructure for obtaining is as shown in Figure 6.450 DEG C of plating is with the temperature of zinc bath and the temperature of Galfan alloy bath
Layer tissue is compared, Fe2Al5ZnxLayer is relatively thin, and with the prolongation of immersion plating time, thickness gathers way slower.Aborning, can pass through
The temperature for reducing zinc bath makes coating microstructure easily control.
Claims (5)
1. the method that a kind of structural steel pair plates Galfan alloy, it is characterised in that：Structural steel elements Jing defats, washing, pickling, water
Wash, help plating, after drying and processing, the first immersion plating in the bath of pure zinc, after taking-up, is soaked in placing into Galfan alloy bath placed side by side
Plating, then water-cooled, obtains product.
2. the method for the double plating Galfan alloys of structural steel according to claim 1, it is characterised in that：Plating is helped before plating
When the use of traditional zinc chloride and ammonia chloride water solution is fluxing agent.
3. the method for the double plating Galfan alloys of structural steel according to claim 1, it is characterised in that：The Galfan is closed
In gold bath, the percentage by weight of Al content is 4～6%, and the percentage by weight of mischmetal content is 0.05～0.2%, balance of
Zinc.
4. the method for the double plating Galfan alloys of structural steel according to claim 1, it is characterised in that：In the pure zinc bath
During immersion plating, the temperature control of immersion plating is 430～470 DEG C；Time is 1～30s.
5. the method for the double plating Galfan alloys of structural steel according to claim 1, it is characterised in that：The Galfan is closed
In gold bath during immersion plating, the temperature of immersion plating is 430～470 DEG C；Time is 5～120s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611025212.0A CN106521386A (en) | 2016-11-22 | 2016-11-22 | Galfan alloy double plating method for structural steel |
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| CN201611025212.0A CN106521386A (en) | 2016-11-22 | 2016-11-22 | Galfan alloy double plating method for structural steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904532A (en) * | 2017-10-31 | 2018-04-13 | 华南理工大学 | A kind of method for constructing the double coating of high anti-corrosion kirsite in steel surface |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012082471A (en) * | 2010-10-12 | 2012-04-26 | Jfe Steel Corp | HOT DIP Zn-Al BASED ALLOY PLATED STEEL SHEET |
| CN104818444A (en) * | 2015-03-04 | 2015-08-05 | 常州大学 | Hot-dip plating silicon-containing Galfan alloy plating layer, and hot-dip plating method |
| CN105154804A (en) * | 2015-10-16 | 2015-12-16 | 河北工业大学 | Plating aid for hot dipping Galfan alloys and plating aid solution |
| CN105220099A (en) * | 2015-10-22 | 2016-01-06 | 天津市工大镀锌设备有限公司 | Plating assistant agent of a kind of batch hot dip Galfan and preparation method thereof |
-
2016
- 2016-11-22 CN CN201611025212.0A patent/CN106521386A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012082471A (en) * | 2010-10-12 | 2012-04-26 | Jfe Steel Corp | HOT DIP Zn-Al BASED ALLOY PLATED STEEL SHEET |
| CN104818444A (en) * | 2015-03-04 | 2015-08-05 | 常州大学 | Hot-dip plating silicon-containing Galfan alloy plating layer, and hot-dip plating method |
| CN105154804A (en) * | 2015-10-16 | 2015-12-16 | 河北工业大学 | Plating aid for hot dipping Galfan alloys and plating aid solution |
| CN105220099A (en) * | 2015-10-22 | 2016-01-06 | 天津市工大镀锌设备有限公司 | Plating assistant agent of a kind of batch hot dip Galfan and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 马瑞娜等: "森吉米尔法和双镀Galfan合金镀层的分析", 《金属热处理》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904532A (en) * | 2017-10-31 | 2018-04-13 | 华南理工大学 | A kind of method for constructing the double coating of high anti-corrosion kirsite in steel surface |
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