CN111455425A - Anodic oxidation process of high-corrosion-resistance automobile aluminum material - Google Patents
Anodic oxidation process of high-corrosion-resistance automobile aluminum material Download PDFInfo
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- CN111455425A CN111455425A CN202010294795.7A CN202010294795A CN111455425A CN 111455425 A CN111455425 A CN 111455425A CN 202010294795 A CN202010294795 A CN 202010294795A CN 111455425 A CN111455425 A CN 111455425A
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- aluminum material
- anodic oxidation
- oxidation process
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to an anodic oxidation process of a high-corrosion-resistance automobile aluminum material, which comprises the following steps: (1) feeding; (2) ultrasonic wax removal; (3) ultrasonic degreasing; (4) electrolytic polishing; (5) removing the film; (6) removing ash; (7) anodizing; (8) sealing holes; (9) cold sealing; (10) passivating; (11) heat sealing; (12) drying; (13) the invention has the beneficial effects of blanking inspection: through forming nanometer hydroxyl graphite alkene protective layer, passivation protection rete, cold seal layer and heat-seal layer on the aluminum product, improve the cohesion on heat-seal layer to form four retes on aluminum substrate surface, very big promotion aluminum substrate's alkali resistance, satisfy the demand to the high light nature of appearance again.
Description
Technical Field
The invention relates to the technical field of aluminum product anodic oxidation treatment, in particular to an anodic oxidation process of a high-corrosion-resistance automobile aluminum product.
Background
With the development of the automobile industry and the aggravation of international competition, customers have higher and higher requirements on the performance of the aluminum alloy anodic oxide film, and especially the appearance of aluminum alloy decorating parts such as luggage racks and the like has high brightness and high corrosion resistance, for example: alkali resistance (pH = 13.5), acid resistance (pH = 1), 480 hours neutral salt spray test, sulfur dioxide five cycle test, walvo abrasion and alkali resistance test, as required by CAPSA, volkswage, steam, bmw, general, etc.
The traditional anodic oxidation process is usually solved by adopting an anodic oxidation and spraying/electrophoresis mode, the mode is high in cost and low in yield, the problem of corrosion resistance of an anodic oxide film on an aluminum alloy substrate cannot be really solved, and a national standard test can only reach CASS 8H and cannot pass tests such as alkali resistance.
Disclosure of Invention
The technical problem to be solved by the present invention is to solve the above-mentioned deficiencies of the prior art,
the anodic oxidation protection layer formed on the surface of the automobile aluminum material prepared by the process not only can meet the requirement of high gloss of appearance, but also can meet the requirement of alkali resistance (the automobile aluminum material does not change color under the condition of ph =13.5 for 10 minutes).
In order to achieve the purpose, the invention provides the following technical scheme: an anodic oxidation process of a high-corrosion-resistance automobile aluminum material is characterized by comprising the following steps: (1) feeding; (2) ultrasonic wax removal; (3) ultrasonic degreasing; (4) electrolytic polishing; (5) removing the film; (6) removing ash; (7) anodizing; (8) sealing holes; (9) cold sealing; (10) passivating; (11) heat sealing; (12) drying; (13) and (5) blanking inspection.
The anodic oxidation process of the high-corrosion-resistance automobile aluminum material can be further set as the step (8) specifically comprising the following steps of adding concentrated sulfuric acid and graphite into a reactor, using potassium permanganate as an oxidant, preparing graphene oxide through medium-temperature and high-temperature two-step oxidation, reducing excessive potassium permanganate with hydrogen peroxide, removing acid and salt in a reaction product by using an electrodialysis method, adding 20% of sodium hydroxide solution to adjust the pH to 9-11, converting sulfate-based graphene into hydroxyl graphene, removing excessive sodium hydroxide by using an electrodialysis method to adjust the pH of a paste of the hydroxyl graphene to 8.0-9.0, adding deionized water to adjust the mass concentration of the nanometer hydroxyl graphene to be 0.3-1.5 g/L, and sealing the aluminum material subjected to the step (7) by using the nanometer hydroxyl graphene sealing agent with the mass concentration of 0.4-1.3 g/L.
The anodic oxidation process of the high-corrosion-resistance automobile aluminum material can be further set as follows: the reaction equation in step (7) 2Al +3H2O = Al2O3+3H 2.
The anodic oxidation process of the high-corrosion-resistance automobile aluminum material can be further set as that the treatment temperature of the step (9) is 25-30 ℃, the treatment time is 20min, the solution component ratio is F-:450-850 mg/L2: 3.0-5.0 g/L, and the solution is prepared by pure water and is circularly filtered in use.
The anodizing process of the high-corrosion-resistance automobile aluminum material can be further configured that the step (10) comprises the steps of putting the aluminum material into a chromium-free passivation solution with the concentration of 19-23 g/L, keeping the temperature at 15-35 ℃, and attaching a passivation protective film on the surface of the aluminum substrate after immersing for 5 min.
The anodic oxidation process of the high-corrosion-resistance automobile aluminum material can be further set as follows: reaction equation 3Al in the step (9)2O3+12H++12F-=2Al3(OH)3F6+3H2O；Al3++3OH-=Al(OH)3；Ni2++2OH-=Ni(OH)2。
The anodic oxidation process of the high-corrosion-resistance automobile aluminum material can be further set as follows: the reaction equation in the step (11) is as follows: M-OH + R-Si- (OH) = M-O-Si-R + H2O; R-SiOH + R-Si- (OH) = R-Si-O-Si-R + H2O.
By adopting the technical scheme, the traditional nickel salt sealant is replaced by the nano-hydroxyl graphene sealant before the cold sealing process, the nano-hydroxyl graphene is filled into the gaps of the anodic oxide layer to seal the gaps, the sealing effect is superior to that of nickel salt sealing, and the defect that the existing nickel salt is sealed is overcome
Sealing the existing technical defects which are harmful to human skin, adding a passivation process between a cold sealing process and a heat sealing process, realizing four sealing holes with the sealing holes before cold sealing, simultaneously changing an active aluminum metal surface layer into an inert surface layer by a passivation solution, thereby preventing destructive substances outside from reacting with the metal surface, achieving the purpose of prolonging the rusting time of the aluminum base material, generating a very compact passivation protective film which has good coverage and is firmly adsorbed on the metal surface on the surface of the aluminum base material after passivation treatment, achieving the purposes of prolonging the rusting time of aluminum and effectively protecting the metal, enabling the metal to have corrosion resistance, improving the binding force of a heat sealing layer by forming a nano hydroxyl graphene protective layer, a passivation protective film layer, a cold sealing layer and a heat sealing layer on the aluminum base material, thereby forming four film layers on the surface of the aluminum base material, greatly improving the alkali resistance of the aluminum base material, but also meets the requirement of high gloss of the appearance.
The invention has the beneficial effects that: the alkali resistance of the aluminum substrate is greatly improved, and the requirement on appearance high gloss is met.
Detailed Description
An anodic oxidation process of a high-corrosion-resistance automobile aluminum material comprises the following steps: (1) feeding; (2) ultrasonic wax removal; (3) ultrasonic degreasing; (4) electrolytic polishing; (5) removing the film; (6) removing ash; (7) anodizing; (8) sealing holes; (9) cold sealing; (10) passivating; (11) heat sealing; (12) drying; (13) blanking inspection, specifically, the step (1) is to perform surface inspection on the aluminum alloy section and record the smoothness, defects, burrs and color difference level of the surface of each section in the same batch;
adding concentrated sulfuric acid and graphite into a reactor, using potassium permanganate as an oxidant, preparing graphene oxide through two steps of oxidation at medium temperature and high temperature, reducing excessive potassium permanganate with hydrogen peroxide, removing acid and salt in a reaction product by using an electrodialysis method, adding 20% sodium hydroxide solution to adjust the pH to 9-11 to convert sulfate-based graphene into hydroxyl graphene, removing excessive sodium hydroxide by using an electrodialysis method to adjust the pH of a hydroxyl graphene paste solution to 8.0-9.0, adding deionized water to adjust the nanometer hydroxyl graphene sealing agent with the mass concentration of 0.3-1.5 g/L, and performing hole sealing on the aluminum material after the step (7) by using the nanometer hydroxyl graphene sealing agent with the mass concentration of 0.4-1.3 g/L, wherein the reaction equation in the step (9) is that
3Al2O3+12H++12F-=2Al3(OH)3F6+3H2O；Al3++3OH-=Al(OH)3；Ni2++2OH-And (3) putting the aluminum material into a chromium-free passivation solution with the concentration of 19-23 g/L, keeping the temperature at 15-35 ℃, immersing for 5min, and attaching a passivation protective film on the surface of the aluminum material, wherein the reaction equation in the step (11) is M-OH + R-Si- (OH) = M-O-Si-R + H2O and R-SiOH + R-Si- (OH) = R-Si-O-Si-R + H2O.
Claims (7)
1. An anodic oxidation process of a high-corrosion-resistance automobile aluminum material is characterized by comprising the following steps: (1) feeding; (2) ultrasonic wax removal; (3) ultrasonic degreasing; (4) electrolytic polishing; (5) removing the film; (6) removing ash; (7) anodizing; (8) sealing holes; (9) cold sealing; (10) passivating; (11) heat sealing; (12) drying; (13) and (5) blanking inspection.
2. The anodic oxidation process of the highly corrosion-resistant automobile aluminum material according to claim 1, wherein the step (8) specifically comprises the steps of adding concentrated sulfuric acid and graphite into a reactor, using potassium permanganate as an oxidant, preparing graphene oxide through two-step oxidation at medium temperature and high temperature, using hydrogen peroxide to reduce excessive potassium permanganate, using an electrodialysis method to remove acid and salt in a reaction product, then adding 20% sodium hydroxide solution to adjust the pH value to 9-11, converting sulfate-based graphene into hydroxyl graphene, using an electrodialysis method to remove excessive sodium hydroxide, enabling the pH value of a hydroxyl graphene paste solution to be 8.0-9.0, adding deionized water to adjust the nanometer hydroxyl graphene hole sealing agent with the mass concentration of 0.3-1.5 g/L, and using the nanometer hydroxyl graphene hole sealing agent with the mass concentration of 0.4-1.3 g/L to seal the aluminum material after the step (7).
3. The anodic oxidation process of the automobile aluminum material with high corrosion resistance according to claim 1, characterized in that: the reaction equation in step (7) 2Al +3H2O = Al2O3+3H 2.
4. The anodic oxidation process of the highly corrosion-resistant automobile aluminum material as claimed in claim 1, wherein the treatment temperature in the step (9) is 25-30 ℃, the treatment time is 20min, the solution component ratio is F-: 450-.
5. The anodic oxidation process of the high corrosion resistance automobile aluminum material is characterized in that the step (10) comprises the steps of putting the aluminum material into a chromium-free passivation solution with the concentration of 19-23 g/L, keeping the temperature at 15-35 ℃, and attaching a passivation protective film on the surface of the aluminum substrate after 5min of immersion.
6. The anodic oxidation process of the automobile aluminum material with high corrosion resistance according to claim 1, characterized in that: reaction equation 3Al in the step (9)2O3+12H++12F-=2Al3(OH)3F6+3H2O；Al3++3OH-=Al(OH)3；Ni2++2OH-=Ni(OH)2。
7. The anodic oxidation process of the automobile aluminum material with high corrosion resistance according to claim 1, characterized in that: the reaction equation in the step (11) is as follows: M-OH + R-Si- (OH) = M-O-Si-R + H2O; R-SiOH + R-Si- (OH) = R-Si-O-Si-R + H2O.
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| CN202010294795.7A CN111455425A (en) | 2020-04-15 | 2020-04-15 | Anodic oxidation process of high-corrosion-resistance automobile aluminum material |
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| CN202010294795.7A CN111455425A (en) | 2020-04-15 | 2020-04-15 | Anodic oxidation process of high-corrosion-resistance automobile aluminum material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111235617A (en) * | 2020-01-17 | 2020-06-05 | 浙江龙纪汽车零部件股份有限公司 | Anodic oxidation process for automobile aluminum material |
| CN113215569A (en) * | 2021-06-08 | 2021-08-06 | 湖北欣洁顺幕墙材料有限公司 | Aluminum product surface environment-friendly treatment processing technology for curtain wall material |
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| CN106637338A (en) * | 2016-12-06 | 2017-05-10 | 上海英汇科技发展有限公司 | Anodic oxidation process for automobile aluminum alloy baggage holders |
| CN110438542A (en) * | 2018-05-04 | 2019-11-12 | 上海澳崎化工科技有限公司 | A kind of anode oxidation process of aluminium alloy automobile luggage carrier |
| CN110952123A (en) * | 2019-12-21 | 2020-04-03 | 广州超邦化工有限公司 | Preparation method of high-corrosion-resistance aluminum alloy anodic oxidation protective layer |
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2020
- 2020-04-15 CN CN202010294795.7A patent/CN111455425A/en active Pending
Patent Citations (3)
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| CN106637338A (en) * | 2016-12-06 | 2017-05-10 | 上海英汇科技发展有限公司 | Anodic oxidation process for automobile aluminum alloy baggage holders |
| CN110438542A (en) * | 2018-05-04 | 2019-11-12 | 上海澳崎化工科技有限公司 | A kind of anode oxidation process of aluminium alloy automobile luggage carrier |
| CN110952123A (en) * | 2019-12-21 | 2020-04-03 | 广州超邦化工有限公司 | Preparation method of high-corrosion-resistance aluminum alloy anodic oxidation protective layer |
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| 梁永鸿 等: ""氯化钾镀锌提高抗蚀性及抗变色性的研究"", 《表面技术》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111235617A (en) * | 2020-01-17 | 2020-06-05 | 浙江龙纪汽车零部件股份有限公司 | Anodic oxidation process for automobile aluminum material |
| CN113215569A (en) * | 2021-06-08 | 2021-08-06 | 湖北欣洁顺幕墙材料有限公司 | Aluminum product surface environment-friendly treatment processing technology for curtain wall material |
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