Method for preparing environment-friendly micro-arc oxidation black ceramic film on aluminum alloy surface

A technology of micro-arc oxidation on the surface of aluminum alloy, applied in the direction of anodic oxidation, etc., can solve the problems of single color, unenvironmental protection of vanadate electrolyte, and not widely used, and achieve uniform color, wide range of process application, and avoid pollution Effect
CN102154673AActive Publication Date: 2011-08-17CSIC NO 12 RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CSIC NO 12 RES INST
Publication Date
2011-08-17

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Abstract

The invention discloses a method for preparing an environment-friendly micro-arc oxidation black ceramic film on an aluminum alloy surface, and the method comprises the following steps: firstly, pouring deionized water into an oxidation tank, weighing 1-10g / L of sodium hexametaphosphate, 1-3g / L of sodium silicate, 0.5-2g / L of potassium hydroxide, 0.2-2g / L of sodium fluoride and 0.5-20g / L of ferric ammonium oxalate in terms of the volume of the added deionized water, and uniformly stirring and mixing the sodium hexametaphosphate, the sodium silicate, the potassium hydroxide and the sodium fluoride to obtain a micro-arc oxidation base electrolyte; adding the weighed ferric ammonium oxalate into the base electrolyte, and stirring and mixing uniformly to obtain an aluminum alloy micro-arc oxidant solution; and then, sequentially carrying out surface deoiling and cleaning, water washing, aluminum alloy micro-arc oxidation, sealing and drying on the aluminum alloy to prepare the environment-friendly micro-arc oxidation black ceramic film on the aluminum alloy surface. By means of the preparation method disclosed by the invention, the problems of single color, limited application range, and environment pollution caused by a vanadate electrolyte, of the existing aluminum alloy ceramic film layer, are solved.
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Description

technical field

[0001] The invention belongs to the technical field of aluminum alloy surface treatment, and relates to a surface treatment method for commonly used aluminum alloys, in particular to a method for preparing an environment-friendly micro-arc oxidation black ceramic film on the surface of an aluminum alloy. Background technique

[0002] Aluminum and its alloys are well known for their light weight, high specific strength, easy processing and good thermal conductivity, and are widely used in many industrial sectors such as aviation, aerospace, military and civil, but their hardness is low and wear-resistant Poor performance and corrosion resistance limit its application range. For some applications, the requirements of high temperature resistance, corrosion resistance, fatigue resistance, temperature sudden change resistance and high temperature air erosion resistance cannot be met. Therefore, the aluminum alloy must be treated with anti-corrosion surface. [0...

Claims

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