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Method for carrying out micro-arc oxidation on blue-colored film layer by aluminum alloy

A technology of micro-arc oxidation and aluminum alloy, which is applied in anodic oxidation and other directions, can solve the problems of weak bonding between the film layer and the substrate, and the corrosion resistance needs to be improved, and achieve the effects of low porosity, good wear resistance and high hardness

Active Publication Date: 2012-11-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent can obtain a black ceramic film, but the thickness of the film layer is relatively thin, the bonding force between the film layer and the substrate is weak, and the corrosion resistance needs to be improved

Method used

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  • Method for carrying out micro-arc oxidation on blue-colored film layer by aluminum alloy
  • Method for carrying out micro-arc oxidation on blue-colored film layer by aluminum alloy
  • Method for carrying out micro-arc oxidation on blue-colored film layer by aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The pre-treated 6063 aluminum alloy pattern was immersed in the prepared electrolyte, the electrical parameters of the test were set, and the pattern was subjected to micro-arc oxidation treatment for 15 minutes. The electrolyte parameters are: sodium silicate concentration 8g / L; potassium hydroxide concentration 1.5g / L; sodium fluoride concentration 0.5g / L; cobalt sulfate concentration is 0.6g / L. The electrical parameters are: the positive and negative voltages are 460V and 100V, respectively; the frequency is 300HZ; the positive and negative duty ratios are 60% and 30%, respectively. The resulting film is light blue, and the surface is smooth and compact, namely A1 .

Embodiment 2

[0030] Changing the concentration of cobalt sulfate in Example 1 to 0.8 g / L, and other parameters unchanged, the resulting film is blue, with a smooth and dense surface, that is, A2.

Embodiment 3

[0032] The concentration of cobalt sulfate in Example 1 is changed to 1.0 g / L, and other parameters remain unchanged, and the obtained film is dark blue with rough surface, namely A3.

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Abstract

The invention relates to a method for carrying out micro-arc oxidation on a blue-colored film layer by an aluminum alloy. The method comprises the following steps of: first, preparing an electrolyte system, wherein the composing concentration of an electrolyte is as follows: 5-11 g / L sodium silicate, 0.5-2.0 g / L potassium hydroxide, 0.3-0.6 g / L sodium fluoride and 0.4-1.1 g / L cobalt sulfate; carrying out micro-arc oxidation on the surface of the cleaned aluminum alloy, wherein electric parameters as follows: positive voltage is 400-500 V, negative voltage is 50-120 V, frequency is 300 HZ and positive and negative duty cycle are respectively 60% and 30%. After being treated by the method provided by the invention, the aluminum alloy has a blue uniform and compact surface. The excellent performance of the film layer is still kept, the binding force between the film layer and a matrix is 30 N; and impedance of the film layer is 4.4 X 105 (omega / cm2).

Description

Technical field [0001] The invention relates to an aluminum alloy micro-arc oxidation surface coloring heat treatment technology, and belongs to the technical field of heat treatment surface modification. Background technique [0002] Aluminum and aluminum alloys are widely used in aviation and automobile manufacturing due to their high specific strength, light weight, and easy forming. But its low hardness, poor wear resistance and corrosion resistance, the application of aluminum and aluminum alloys in many fields is limited. There are many ways to improve the properties of aluminum and aluminum alloys, mainly including anodic oxidation, physical vapor deposition, laser surface treatment and micro-arc oxidation. [0003] Micro-arc oxidation is also called micro-plasma oxidation, spark discharge anodic oxidation, anodic spark deposition and plasma electrolytic anodization. It is an emerging surface treatment technology developed on the basis of traditional anodic oxidation. This...

Claims

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Application Information

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IPC IPC(8): C25D11/06
Inventor 陈传忠王建华
Owner SHANDONG UNIV
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