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Electrolytic solution for differential arc oxidization surface treatment of magnesium aluminum alloy in aluminates system

A micro-arc oxidation, aluminum alloy technology, applied in the field of aluminum alloy surface modification, magnesium, can solve the problem of no aluminate system research, etc., to achieve a broad market and the effect of

Inactive Publication Date: 2009-09-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Many scientific research institutions in China are working on the research and development of micro-arc oxidation technology. From the available patents and other documents, most research units have adopted silicate, phosphate and sodium hydroxide systems as micro-arc oxidation electrolysis technology. However, individual units use aluminate as an additive or add it to the electrolyte in a small amount, and there is no systematic and in-depth study on the aluminate system

Method used

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  • Electrolytic solution for differential arc oxidization surface treatment of magnesium aluminum alloy in aluminates system
  • Electrolytic solution for differential arc oxidization surface treatment of magnesium aluminum alloy in aluminates system
  • Electrolytic solution for differential arc oxidization surface treatment of magnesium aluminum alloy in aluminates system

Examples

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Effect test

Embodiment 1

[0028] Example 1: The electrolytic solution is a single sodium aluminate system, and the sodium aluminate is 4 g / L according to the ratio of weight to total volume. Place the sample in the electrolyte, connect the positive pole of the power supply, and connect the stainless steel tank to the negative pole of the power supply. The constant current method is used to control the micro-arc oxidation process, and the current density is constant at 3A / dm 2 . From the experimental phenomenon, the reaction is stable, but due to the low solute concentration and low current density, the film formation rate is very small, and the film thickness is only 3 microns after oxidation for 20 minutes. When the voltage rises to 500V, the arc starts and the spark is blue. During the experiment, there is a very weak popping sound, and the voltage reaches 580V when it is terminated. After oxidation, seal the pores with boiling water and blow dry. It can be seen that a light off-white smooth and d...

Embodiment 2

[0029] Example 2: The electrolytic solution is a single aluminate system, and 40 g / L of sodium aluminate is used according to the ratio of weight to total volume. The current density is constant at 5A / dm 2 , After 20 minutes, the voltage remained at 424 volts, and the remaining operations were the same as the previous example. Due to the high electrolyte concentration, the ceramic layer formed on the surface of the sample after micro-arc oxidation treatment is thicker than that of the previous example, but the roughness is increased.

Embodiment 3

[0030] Example 3: The electrolytic solution is an aluminate composite system. According to the ratio of weight to total volume, 4 g / L of sodium aluminate and 10 g / L of sodium hydroxide are used. The current density was constant at 3A / dm2, and the oxidation was performed for 20 minutes, and the rest of the operations were the same as those in the previous example.

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Abstract

The invention belongs to the surface modification technology of magnesium and aluminum alloys, and in particular relates to an electrolytic solution for micro-arc oxidation surface treatment of magnesium and aluminum alloy parts. The electrolytic solution includes sodium aluminate and various auxiliary components: according to the ratio of weight to total volume: it includes 4-40 g / L of sodium aluminate and 0-10 g / L of sodium hydroxide. The purpose of the present invention is to provide an aluminate system micro-arc oxidation treatment electrolyte that can significantly improve the corrosion resistance and mechanical properties of magnesium and aluminum alloy parts. The surface of the magnesium and aluminum alloy micro-arc oxidation ceramic layer prepared by the invention is smooth and fine, and has good stain resistance, corrosion resistance and good mechanical properties.

Description

technical field [0001] The invention belongs to the surface modification technology of magnesium and aluminum alloys, and in particular relates to an electrolytic solution for micro-arc oxidation surface treatment of magnesium and aluminum alloy parts. Background technique [0002] At present, the automobile industry is developing in the direction of high speed and energy saving. The lightweight of automobiles is the development direction of automobiles. The main way is to use non-ferrous metals with low density, such as aluminum and magnesium alloys. Since magnesium and aluminum elements are very active, their products are extremely prone to oxidation during processing and use. Therefore, the main problem that limits the wide application of magnesium and aluminum alloys in automotive and other fields is the problem of corrosion resistance. Secondly, the mechanical properties of magnesium and aluminum alloys at room temperature, especially the low strength and plastic toughn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06C25D11/30
Inventor 刘耀辉李颂刘海峰庞磊朱先勇
Owner JILIN UNIV
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