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Aluminum or aluminium alloy oxide precursor anodic oxidation method

An anodizing, aluminum alloy technology, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of high cost, complicated pretreatment method, difficult to realize application, etc., and achieve simple process method and easy operation. , the effect of process stability

Inactive Publication Date: 2010-12-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of these elements can improve the corrosion resistance of the oxide film, but the above-mentioned anodic oxidation pretreatment methods are relatively complicated and costly, and it is difficult to realize the application in industry
[0004] With the development of industrial technology, ordinary sulfuric acid anodic oxidation technology can no longer meet the corrosion resistance requirements of oxide film in various harsh corrosive environments. Combining alloy elements to prepare new composite aluminum anodic oxidation film to improve its performance has become the current research one of the hot spots
However, there is no report on the introduction of other third alloying elements into the Al-Ni anodized film.

Method used

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  • Aluminum or aluminium alloy oxide precursor anodic oxidation method
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  • Aluminum or aluminium alloy oxide precursor anodic oxidation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1 The surface of the industrial pure aluminum L2 sample is polished with 300# to 800# water sandpaper in sequence, degreased with acetone, degreased with alkaline chemical sodium hydroxide, and polished with nitric acid solution.

[0064] 2 Prepare 85g / L Nd(NO 3 ) 3 +180g / L Ni(NO 3 ) 2 The solution was adjusted to pH 8 with sodium carbonate. All reagents were of chemical purity.

[0065] 3 Turn on the constant temperature oil bath switch, heat the solution temperature to 90°C, and keep the temperature constant.

[0066] 4 Put the aluminum sample whose surface has been cleaned and degreased into the solution, and the reaction time is 1h.

[0067] 5 After the reaction, take out the sample, wash it with water, dry it with cold wind, put it in an oven, and keep it at 80°C for 1h.

[0068] 6 Anodizing, the condition is: 200g / L H 2 SO 4 Solution, current density 1.5A / dm 2 , temperature 20±2°C, oxidation time 30min; take out the sample, wash it with water, and dry it ...

Embodiment 2

[0070] 1 The surface of the industrial pure aluminum L2 sample is polished with 300# to 800# water sandpaper in sequence, degreased with acetone, degreased with alkaline chemical sodium hydroxide, and polished with nitric acid solution.

[0071] 2 Prepare 75g / L Ce(NO 3 ) 3 +180g / L Ni(NO 3 ) 2 The solution was adjusted to pH 8 with sodium carbonate. All reagents were of chemical purity.

[0072] 3 Turn on the constant temperature oil bath switch, heat the solution temperature to 90°C, and keep the temperature constant.

[0073] 4 Put the aluminum sample whose surface has been cleaned and degreased into the solution, and the reaction time is 1h.

[0074] 5 After the reaction, take out the sample, wash it with water, dry it with cold wind, put it in an oven, and keep it at 80°C for 1h.

[0075] 6 Anodizing, the condition is: 200g / L H 2 SO 4 Solution, current density 1.5A / dm 2 , temperature 20±2°C, oxidation time 30min; take out the sample, wash it with water, and dry it ...

Embodiment 3

[0077] 1 The surface of the industrial pure aluminum L2 sample is polished with 300# to 800# water sandpaper in sequence, degreased with acetone, degreased with alkaline chemical sodium hydroxide, and polished with nitric acid solution.

[0078] 2 Prepare 95g / L Nd(NO 3 ) 3 +180g / L Ni(NO 3 ) 2 The solution was adjusted to pH 8 with sodium carbonate. All reagents were of chemical purity.

[0079] 3 Turn on the constant temperature oil bath switch, heat the solution temperature to 80°C, and keep the temperature constant.

[0080] 4 Put the aluminum sample whose surface has been cleaned and degreased into the solution, and the reaction time is 3h.

[0081] 5 After the reaction, take out the sample, wash it with water, dry it with cold wind, put it in an oven, and keep it at 70°C for 0.5h.

[0082] 6 Anodizing, the condition is: 150g / LH 2 SO 4 Solution, current density 2A / dm 2 , temperature 20±2°C, oxidation time 30min; take out the sample, wash it with water, and dry it w...

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Abstract

The invention relates to an aluminum or aluminium alloy oxide precursor anodic oxidation method which adopts Ni (NO3)2 solution of rare earth salt for chemical pretreatment to form Ni-Al double-hydroxy metal oxide on the surface of aluminum, and leads a rare earth composite anodic oxidation film to be formed on the surface of aluminum or aluminium alloy through electrochemical anodic oxidation treatment. As the composite anodic oxidation film with rare-earth elements is introduced, the invention has more compact structure, and remarkably improves the surface hardness and the corrosion resistance of the material.

Description

Technical field: [0001] The invention relates to an anodic oxidation method of aluminum or aluminum alloy oxide precursor method. Background technique: [0002] Anodizing is the most commonly used surface treatment method for aluminum or aluminum alloys, which can greatly improve the corrosion resistance of aluminum and aluminum alloys. Aluminum and its alloys are anodized in an acid solution (such as sulfuric acid) to form a porous anodized film with a controllable thickness. The purpose of anodizing treatment is to improve corrosion resistance, surface pollution resistance, light and weather resistance, which is a very important technical link. [0003] The introduction of alloying elements during anodic oxidation makes the aluminum anodized film have the properties of some alloying elements, thereby improving the performance of the oxide film. The introduction of titanium into the oxide film can significantly improve the corrosion resistance of the oxide film, and the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16
Inventor 左禹李启征唐聿明赵旭辉
Owner BEIJING UNIV OF CHEM TECH
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