CN101831652A - Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy - Google Patents
Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy Download PDFInfo
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- CN101831652A CN101831652A CN200910010653A CN200910010653A CN101831652A CN 101831652 A CN101831652 A CN 101831652A CN 200910010653 A CN200910010653 A CN 200910010653A CN 200910010653 A CN200910010653 A CN 200910010653A CN 101831652 A CN101831652 A CN 101831652A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 60
- 239000011248 coating agent Substances 0.000 title claims abstract description 59
- 238000000576 coating method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract 4
- 229910052593 corundum Inorganic materials 0.000 title abstract 4
- 229910001845 yogo sapphire Inorganic materials 0.000 title abstract 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 40
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 27
- 238000009713 electroplating Methods 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 15
- 238000010288 cold spraying Methods 0.000 claims abstract description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000004411 aluminium Substances 0.000 claims description 14
- 229910018173 Al—Al Inorganic materials 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Inorganic materials [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 8
- 235000006408 oxalic acid Nutrition 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000007743 anodising Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- XEEVLJKYYUVTRC-UHFFFAOYSA-N oxomalonic acid Chemical compound OC(=O)C(=O)C(O)=O XEEVLJKYYUVTRC-UHFFFAOYSA-N 0.000 claims description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims 4
- 238000003475 lamination Methods 0.000 claims 2
- 239000001103 potassium chloride Substances 0.000 claims 2
- 235000011164 potassium chloride Nutrition 0.000 claims 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 239000004115 Sodium Silicate Substances 0.000 claims 1
- 235000019795 sodium metasilicate Nutrition 0.000 claims 1
- 229910052911 sodium silicate Inorganic materials 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 238000004381 surface treatment Methods 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000011253 protective coating Substances 0.000 abstract description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract 1
- 238000005498 polishing Methods 0.000 description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000005488 sandblasting Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- VZWGHDYJGOMEKT-UHFFFAOYSA-J sodium pyrophosphate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O VZWGHDYJGOMEKT-UHFFFAOYSA-J 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000004506 ultrasonic cleaning Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 2
- DPDMMXDBJGCCQC-UHFFFAOYSA-N [Na].[Cl] Chemical compound [Na].[Cl] DPDMMXDBJGCCQC-UHFFFAOYSA-N 0.000 description 2
- 229940055858 aluminum chloride anhydrous Drugs 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910009043 WC-Co Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention relates to a method for preparing an Al-Al2O3 composite coating on the surface of magnesium alloy, belonging to the technical field of metal surface treatment. The Al/Al2O3 composite coating prepared on the surface of the magnesium alloy by a calorization-oxidation method has high corrosion resistance and rigidity. The method comprises the following main steps of: firstly, coating an aluminum coating to the magnesium alloy, and then electrochemically oxidizing the aluminum coating to form an aluminum oxide film layer having extremely high corrosion resistance and rigidity, wherein a cold spraying method or a molten-salt aluminum electroplating method is used in the preparation process of the aluminum coating of the magnesium alloy, and common anodic oxidization and plasma anodic oxidization are used for the oxidation of the aluminum coating. By coating the aluminum coating to the surface of the magnesium alloy to carry out calorization treatment and then carrying out electrochemical anodic oxidization, the invention enhances the comprehensive protective performance of the surface of the magnesium alloy, and the Al/Al2O3 composite coating prepared on the surface of the magnesium alloy has the advantages of large bonding strength, high rigidity, good corrosion resistance and the like, thereby being the ideal protective coating for the magnesium alloy.
Description
Technical field
The present invention relates to prepare Al-Al at Mg alloy surface
2O
3The method of composite coating belongs to field of metal surface treatment technology.
Background technology
Lighting is the equipment technology performance optimization and alleviates inevitable requirement and the development trend that environment (discharging) is influenced.Magnesium alloy is owing to have high specific tenacity, specific rigidity, and good damping characteristic is the structural metallic materials that satisfies the tool potentiality of lighting, environmental protection development.Compare with aluminium alloy, magnesium alloy can improve loss of weight potentiality 20～25%.But the wear resistance and the thermodynamic stability of magnesium alloy are relatively poor, and because oxide compound (film) loosens (PBR＜1), can not form the dense oxidation film of self-passivation as aluminium alloy in environment.Magnesium alloy is all had relatively high expectations to the integrity of protective layer, anti-physical abuse ability simultaneously, and conventional being coated with/coating technology is difficult to satisfy (as automotive hub, firearms, spacecraft activation part etc.) actual requirement, so development of effective wear Protection coating new technology is to promote magnesium alloy key in application place.
In recent years, the sufacing that is intended to improve protective magnesium alloy surface and wearability is explored the focus that has become domestic and international research.As for eliminating the residual stress between matrix and the ceramic coating, developed thermal spraying Al-Al
2O
3/ TiO
2Gradient coating the thermal shock resistance of coating is made moderate progress, but the fuel factor that the magnesium alloy substrate performance is not sprayed unavoidably affects.(HVOF) prepares the WC-Co coating at Mg alloy surface by HVOF (High Velocity Oxygen Fuel), because " from the alligatoring " of spraying particle effect, the coating that is obtained have higher binding strength (＞40MPa), but because the cathode characteristic of coating and bigger porosity cause the corrosive nature of matrix magnesium alloy to worsen; When increasing the Al tie coat between this coating and matrix, though barrier propterty improves, combining between transition layer and the matrix is relatively poor.Al-Al with the laser melting and coating technique preparation
2O
3Coating all is increased superficial hardness of magnesium alloy and wearability, and has the little advantage of heat affecting, but is difficult to complex-shaped surface is processed, and coating efficiency is also lower.Vapour deposition, ion implantation etc. also is used for the modification of Mg alloy surface by discussion, all be difficult to reach higher level but result of study so far shows its protective capacities and wear resistance, and the bonding properties of coating also often becomes restraining factors.
Obviously, the development of above-mentioned magnesium alloy surface treatment has all obtained result highly significant in certain aspect, but satisfying on the higher wear Protection needs of actual magnesium alloy, does not reach yet substantial requirement.
Summary of the invention
The invention reside in and overcome the deficiencies in the prior art, provide a kind of and prepare Al-Al at Mg alloy surface
2O
3The method of composite coating is implemented to carry out electrochemical anodic oxidation after calorize is processed to Mg alloy surface by the coated with aluminum coating, with the Al/Al of preparation than high corrosion resistant again
2O
3Composite coating is to strengthen the integrated protection performance of Mg alloy surface.
The present invention implements by following technical proposal:
(1) coated with aluminum coating
1) cold spraying method
To carry out blasting treatment through polishing, polish, remove the pretreated magnesium alloy sample of wet goods, to remove surface scale and increase surface roughness.Carry out sandblasting and help strengthening the bonding force of coating and magnesium alloy substrate, prevent coming off of coating.
Magnesium alloy after the sandblasting changes over to rapidly in the cold spray apparatus vacuum chamber and sprays aluminum coating, the powder size of sandblast aluminium dust is more than 400 orders, the spraying gas temperature is decided to be 150-300 ℃, pressure is 1.5-2.5MPa, spray distance is 20-40mm, the thickness of aluminum coating is more than 0.5mm, and preferable range is 1-3mm.The Mg alloy surface that is coated with aluminum coating is carried out suitable sanding and polishing to reduce surfaceness, in order to subsequent disposal.
2) fused salt Electroplating Aluminum method
Magnesium alloy is carried out the processing of preplating zinc after polishing, polish, remove the wet goods pre-treatment, galvanized layer thickness is at 2-20 μ m.Pre-zinc-plated main purpose is for strengthening the adhesion of aluminium coat and magnesium alloy substrate.
Pre-galvanized magnesium alloy is carried out the plating of aluminium to obtain aluminum coating at inorganic fused salt.Inorganic fused salt is made up of Aluminum chloride anhydrous, sodium-chlor and Repone K, and their weight ratio of constituents is: Aluminum chloride anhydrous accounts for 65～90%; Sodium-chlor, Repone K or the mixture of the two account for 10～35%; Electroplating technological parameter is: service temperature is 120～200 ℃, and electroplating time is 30～180 minutes, current density 0.5～5A/dm
2, the electroplating aluminum coating thickness of acquisition is 20-50 μ m.
(2) oxidation of aluminum coating
1) oxalic acid anodizing
The magnesium alloy sample that is coated with sprayed aluminum layer or electroplating aluminum coating is put into electrolytic solution carry out the oxalic acid anodizing processing.Electrolytic solution mesoxalic acid concentration is 40-80g/L, and all the other are water; Electrolyte temperature is 10-30 ℃, and anodic current density is 0.5-2A/dm
2, oxidization time is 20-60 minute, oxide thickness is 5-30 μ m.
2) plasma anonizing
The magnesium alloy sample that is coated with sprayed aluminum layer or electroplating aluminum coating is put into electrolytic solution adopts the high voltage pulse mode that sample is carried out plasma spark discharge oxidation.The plasma anodic oxidation solution is: sodium hydroxide 1.5-2.5g/L, and water glass 7-11g/L, all the other are water, temperature is 10-100 ℃.Adopt pulse mode to carry out oxidation, pulse-repetition is 100-2000Hz, and current density is 1-10A/dm
2, oxidization time is 30-120 minute, oxide thickness is 5-40 μ m.
Advantage of the present invention and beneficial effect are as follows:
By the Al/Al of the inventive method in the Mg alloy surface preparation
2O
3Composite coating has that bond strength is big, hardness is high, corrosion resistance and be conducive to recycling etc. the advantage of magnesium alloy, is the desirable protective coating of magnesium alloy.Use and the energy utilization efficiency height of the present invention's unharmful substance in the process of preparation magnesium alloy coating have the low characteristic of environmental protection and energy consumption.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1
1. material is prepared: after the AZ91D magnesium alloy cutting polishing, use the Ultrasonic Cleaning oil removing in acetone soln.
2. sandblast: with glass sand Mg alloy surface is carried out sandblasting, remove surface scale, increase roughness.
3. cold spraying aluminium: the powder size of sandblast aluminium dust is at 600 orders, and spraying gas (helium, argon or nitrogen) temperature is decided to be 150-220 ℃, and pressure is 1.8-2.1MPa, and spray distance is 20-40mm, and spray time is 20 minutes, and the thickness of aluminum coating is about 2mm.
4. polishing: the specimen surface to spraying aluminium carries out suitable polishing, makes its smooth.
5. plasma oxidation: sodium hydroxide 2g/L, water glass 10g/L, all the other are water, temperature is a room temperature.Adopt pulse mode to carry out oxidation, pulse-repetition is 1000Hz, and current density is 2A/dm
2, oxidization time is 60 minutes, oxide thickness is 15 μ m.
Al/Al by the present embodiment acquisition
2O
3Bond strength＞the 25MPa of composite coating system, surperficial Vickers hardness maximum can reach 1000HV, and anti-neutral salt spray test reached more than 2000 hours.
Embodiment 2
1. material is prepared: after the AZ91D magnesium alloy cutting polishing, use the Ultrasonic Cleaning oil removing in acetone soln.
2. sandblast: with glass sand Mg alloy surface is carried out sandblasting, remove surface scale, increase roughness.
3. cold spraying aluminium: the powder size of sandblast aluminium dust is 800 orders, and spraying gas (helium, argon or nitrogen) temperature is decided to be 150-220 ℃, and pressure is 1.8-2.1MPa, and spray distance is 20-40mm, and spray time is 20 minutes, and the thickness of aluminum coating is about 2mm.
4. polishing: the specimen surface to spraying aluminium carries out suitable polishing, makes its smooth.
5. oxalic acid anodizing: concentration of oxalic acid is 60g/L, and all the other are water; Oxidizing temperature is a room temperature, and anodic current density is 1.5A/dm
2, oxidization time is 60 minutes, oxide thickness is 25 μ m.
Al/Al by the present embodiment acquisition
2O
3Bond strength＞the 25MPa of composite coating system, surperficial Vickers hardness maximum can reach 600HV, no peeling and bubbling phenomenon after 3.5%NaCl solution floating coat soaks 1200 hours.
Embodiment 3
1. material is prepared: after the AZ31B magnesium alloy cutting polishing, use the Ultrasonic Cleaning oil removing in acetone soln.
2. etch: Na
4P
2O
7.10H
2O 40g/L, Na
2CO
33.7g/L, NaNO
35g/L, NaH
2PO
4.2H
205g/L, all the other are water, 50～70 ℃ of temperature were handled 0.5～5 minute, cleaned 1～2 minute with tap water immediately after the taking-up, used washed with de-ionized water again 1～2 minute.
3. activation: HF 30ml/L, ZnO 20g/L, all the other are water, 10～35 ℃ of temperature were handled 0.5～5 minute, cleaned 1～2 minute with tap water immediately after the taking-up, used washed with de-ionized water again 1～2 minute.
4. in advance zinc-plated: ZnSO
4.7H
2O 35.6g/L, Na
4P
2O
7.10H
2O 134g/L, C
6H
5Na
3O
7.2H
2O10g/L, KF.2H
2O 10g/L, lauryl sodium sulfate 0.1g/L, all the other are water, PH=9.0～10.0,40～70 ℃ of temperature, cathode-current density 0.1～0.5A/dm
2, the time is 5～60 minutes, cleans 1～2 minute with running water immediately after the taking-up, uses washed with de-ionized water 1～2 minute again.Galvanized layer thickness is about 10 μ m.
5. Electroplating Aluminum: AlCl
380wt%, NaCl 10wt%, KCl 10wt% mixes the back and fully is melted into liquid fused salt, cathode current density 1.5～3A/dm in 180 ℃ under argon shield
2, 40～90 minutes time, cleaned 1～2 minute with tap water immediately after the taking-up, used washed with de-ionized water again 1～2 minute, at last oven dry.The aluminium coat thickness that obtains is about 40 μ m.
6. oxalic acid anodizing: concentration of oxalic acid is 60g/L, and all the other are water, and oxidizing temperature is a room temperature, and anodic current density is 1A/dm
2, oxidization time is 30 minutes, oxide thickness is 10 μ m.
Al/Al by the present embodiment acquisition
2O
3Bond strength＞the 50MPa of composite coating system, surperficial Vickers hardness maximum can reach 400HV, no peeling and bubbling phenomenon after 3.5%NaCl solution floating coat soaks 1200 hours.
Embodiment 4
1. material is prepared: after the AZ31B magnesium alloy cutting polishing, use the Ultrasonic Cleaning oil removing in acetone soln.
2. etch: Na
4P
2O
7.10H
2O 40g/L, Na
2CO
33.7g/L, NaNO
35g/L, NaH
2PO
4.2H
205g/L, all the other are water, 50～70 ℃ of temperature were handled 0.5～5 minute, cleaned 1～2 minute with tap water immediately after the taking-up, used washed with de-ionized water again 1～2 minute.
3. activation: HF 30ml/L, ZnO 20g/L, all the other are water, 10～35 ℃ of temperature were handled 0.5～5 minute, cleaned 1～2 minute with tap water immediately after the taking-up, used washed with de-ionized water again 1～2 minute.
4. in advance zinc-plated: ZnSO
4.7H
2O 35.6g/L, Na
4P
2O
7.10H
2O 134g/L, C
6H
5Na
3O
7.2H
2O10g/L, KF.2H
2O 10g/L, lauryl sodium sulfate 0.1g/L, all the other are water, PH=9.0～10.0,40～70 ℃ of temperature, cathode-current density 0.1～0.5A/dm
2, the time is 5～60 minutes, cleans 1～2 minute with running water immediately after the taking-up, uses washed with de-ionized water 1～2 minute again.Galvanized layer thickness is about 10 μ m.
5. Electroplating Aluminum: AlCl
374wt%, NaCl 12wt%, KCl 14wt% mixes the back and fully is melted into liquid fused salt, cathode current density 1.5～3A/dm in 180 ℃ under argon shield
2, 40～90 minutes time, cleaned 1～2 minute with tap water immediately after the taking-up, used washed with de-ionized water again 1～2 minute, at last oven dry.The aluminium coat thickness that obtains is about 40 μ m.
6. plasma oxidation: sodium hydroxide 1.5g/L, water glass 8g/L, all the other are water, temperature is a room temperature.Adopt pulse mode to carry out oxidation, pulse-repetition is 1000Hz, and current density is 1A/dm
2, oxidization time is 40 minutes, oxide thickness is 8 μ m.
Al/Al by the present embodiment acquisition
2O
3Bond strength＞the 50MPa of composite coating system, surperficial Vickers hardness maximum can reach 600HV, no peeling and bubbling phenomenon after 3.5%NaCl solution floating coat soaks 1200 hours.
Claims (8)
1. one kind prepares Al-Al at Mg alloy surface
2O
3The method of composite coating is characterized in that: at first to magnesium alloy coated with aluminum coating, then aluminized coating is carried out electrochemical anodic oxidation and process.
2. according to claim 1ly prepare Al-Al at Mg alloy surface
2O
3The method of composite coating is characterized in that: adopt cold spray process that magnesium alloy is sprayed aluminium lamination, perhaps by the method for Molten Salt Electroplating magnesium alloy is carried out electroplating aluminum coating.
3. according to claim 2ly prepare Al-Al at Mg alloy surface
2O
3The method of composite coating, it is characterized in that: before the cold spraying aluminium lamination magnesium alloy is carried out blasting treatment, the cold spray process parameter is: powder size is more than 400 orders, the spraying gas temperature is decided to be 150-300 ℃, pressure is 1.5-2.5MPa, spray distance is 20-40mm, and the thickness of aluminized coating is more than 1mm.
4. according to claim 2ly prepare Al-Al at Mg alloy surface
2O
3The method of composite coating is characterized in that: magnesium alloy is carried out carrying out the processing of preplating zinc before the Molten Salt Electroplating, as bottom, in the inorganic fused salt system magnesium alloy is carried out Electroplating Aluminum with zinc coat again.
5. according to claim 4ly prepare Al-Al at Mg alloy surface
2O
3The method of composite coating is characterized in that: inorganic fused salt contains anhydrous Aluminum chloride, calorize sodium and potassium chloride, by its percentage by weight is: anhydrous Aluminum chloride accounts for 65～90%; Sodium chloride, potassium chloride or the mixture of the two account for 10～35%; Electroplating technological parameter is: operating temperature is 120～200 ℃, and electroplating time is 30～180 minutes, current density 0.5～5A/dm
2, the thickness of the aluminium coat of acquisition is 20-50 μ m.
6. prepare Al-Al according to claim 1 at Mg alloy surface
2O
3The method of composite coating is characterized in that: electrochemical anodic oxidation adopts oxalic acid anodizing or plasma anodic oxidation.
7. prepare Al-Al according to claim 6 at Mg alloy surface
2O
3The method of composite coating is characterized in that: oxalic acid anodizing mesoxalic acid concentration is 40-80g/L, and all the other are water; Electrolyte temperature is 10-30 ℃, and anodic current density is 0.5-2A/dm
2, oxidization time is 20-60 minute, oxide thickness is 5-30 μ m.
8. prepare Al-Al according to claim 6 at Mg alloy surface
2O
3The method of composite coating is characterized in that: electrolyte contains NaOH 1-3g/L, sodium metasilicate 5-20g/L, and all the other are water, temperature is 0-100 ℃; Adopt pulse mode to carry out oxidation, pulse frequency is 50-3000Hz, and current density is 1-10A/dm
2, oxidization time is 30-120 minute, oxide thickness is 5-40 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910010653A CN101831652A (en) | 2009-03-11 | 2009-03-11 | Method for preparing Al-Al2O3 composite coating on surface of magnesium alloy |
Applications Claiming Priority (1)
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