Preparation method for black micro arc oxidation film layers of surfaces of pure aluminum and aluminum alloys

A technology of micro-arc oxidation on the surface of aluminum alloy, applied in the direction of anodic oxidation, etc., can solve the problem of preparing black micro-arc oxidation film on the surface of pure aluminum that has not yet been seen, and achieve the effect of realizing diversified colors and meeting decorative needs

Inactive Publication Date: 2017-05-10
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no literature on the preparation of blac

Method used

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  • Preparation method for black micro arc oxidation film layers of surfaces of pure aluminum and aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The steps and conditions are as follows:

[0043] a) Reagents used

[0044] Main film forming agent: sodium phosphate;

[0045] pH regulator: Potassium Hydroxide;

[0046] Colorants: sodium tungstate, sodium molybdate and ammonium metavanadate;

[0047] The chemical reagents used are of analytical grade, and distilled water is used when preparing the treatment solution.

[0048] b) equipment used

[0049] MH-15kW micro-arc oxidation power supply, electrolyzer, stirring system and cooling system;

[0050] The material is pure aluminum.

[0051] c) Preparation of micro-arc oxidation coloring treatment solution

[0052] First pour distilled water into the equipment, add reagents at room temperature, the order and concentration range of reagents are: sodium phosphate 20g / L, potassium hydroxide 2g / L, sodium tungstate 8g / L, sodium molybdate 8g / L and partial Ammonium vanadate 4g / L, and keep stirring during the addition process. After one reagent is completely dissolved,...

Embodiment 2

[0063] a) The reagent used is the same as in Example 1.

[0064] b) equipment used

[0065] MH-15kW micro-arc oxidation power supply, electrolyzer, stirring system and cooling system;

[0066] The material is LY12 aluminum alloy.

[0067] c) Preparation of micro-arc oxidation coloring treatment solution

[0068] First pour distilled water into the equipment, add reagents at room temperature, the order and concentration range of reagents are: sodium phosphate 30g / L, potassium hydroxide 2g / L, sodium tungstate 8g / L, sodium molybdate 8g / L and partial Ammonium vanadate 5g / L, and keep stirring during the addition process. After one reagent is completely dissolved, add another reagent. After the addition is complete, continue stirring until the reagent is completely dissolved.

[0069] d) Implementation of micro-arc oxidation process

[0070] 1) LY12 aluminum alloy surface degreasing cleaning

[0071] Put the test piece into the sodium hydroxide solution with a concentration of ...

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Abstract

The invention discloses a preparation method for micro arc oxidation black ceramic films of pure aluminum and aluminum alloys and belongs to the technical field of surface treatment of the pure aluminum and the aluminum alloys. Sodium tungstate, sodium molybdate and ammonium metavanadate serve as color additives. In the alkaline electrolyte taking phosphate as a main salt, coloring is conducted while the pure aluminum or the aluminum alloys are subjected to micro arc oxidation by setting up electrical parameters adaptable to the electrolyte. The black ceramic films prepared through the preparation method for the micro arc oxidation black ceramic films have the characteristics that hardness is high, abrasion resistance and corrosion resistance are very good, the color is even and blackness is high, and the application prospects are wide.

Description

technical field [0001] The invention relates to the technical field of surface treatment of pure aluminum and aluminum alloys, in particular to a method for preparing a black micro-arc oxidation film layer on the surface of pure aluminum and aluminum alloys. Background technique [0002] Pure aluminum and aluminum alloys have the characteristics of low density, high strength, and easy forming, so they are used in almost all industrial sectors. However, pure aluminum and aluminum alloys have poor wear resistance and corrosion resistance, low heat resistance, and low rigidity, so their applications are greatly restricted. Micro-arc oxidation, also known as plasma micro-arc oxidation, is to place magnesium, aluminum, titanium and other metals and their alloys in electrolyte solution, and use them under the combined action of high temperature, high pressure, thermochemistry, plasma chemistry and electrochemistry. A method of generating a spark discharge on the surface of a mate...

Claims

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Application Information

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IPC IPC(8): C25D11/14C25D11/06
CPCC25D11/026C25D11/06C25D11/14
Inventor 王晓波全风美姜云波杨婷婷谢志强吕学超
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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