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Aluminum alloy micro-arc oxidation method

A technology of micro-arc oxidation and process method, which is applied in the field of surface treatment of metal parts, can solve problems such as not being able to meet higher technical requirements, and achieve the effect of improving corrosion resistance

Inactive Publication Date: 2015-06-10
GUIZHOU HONGLIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the improvement of the performance requirements of aero-engines, these traditional surface treatment technologies cannot meet the higher technical requirements. Therefore, it is necessary to develop new technologies to improve product performance. Under such a technical background, micro-arc oxidation technology should be used born

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 of the present invention: a kind of micro-arc oxidation process of aluminum alloy, in material and composition thereof: sodium phosphate 40g-50g / l; Sodium tetraborate 20g-25g / l; Sodium hexametaphosphate 25g-30g / l The workpiece is placed in the bath for micro-arc oxidation. During the micro-arc oxidation process, the temperature of the bath solution is: 10-25°C, and the current density is 3.5-4.5 A / dm 2 , the duty cycle is 12-15, and the frequency is 150-250Hz.

Embodiment 2

[0014] Embodiment 2 of the present invention: a kind of micro-arc oxidation process of aluminum alloy, in material and composition thereof: sodium phosphate 40g / l; Sodium tetraborate 20g / l; Sodium hexametaphosphate 25g / l bath puts into The workpiece is subjected to micro-arc oxidation. During the micro-arc oxidation process, the bath temperature is: 10±2°C, and the current density is 3.5A / dm 2 , the duty cycle is 12, and the frequency is 150Hz. Compared with Example 1, the material composition is more reasonable, and the micro-arc oxidation process is more stable.

Embodiment 3

[0015] Embodiment 3 of the present invention: a kind of micro-arc oxidation process of aluminum alloy, in material and composition thereof: sodium phosphate 50g / l; Sodium tetraborate 25g / l; Sodium hexametaphosphate 30g / l bath puts into The workpiece is subjected to micro-arc oxidation. During the micro-arc oxidation process, the bath temperature is: 25±2°C, and the current density is 4.5A / dm 2 , the duty cycle is 15, and the frequency is 250Hz. Compared with Example 2, under the same time conditions, the film forming speed is 10% faster.

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Abstract

The invention discloses an aluminum alloy micro-arc oxidation method. A workpiece undergoes micro-arc oxidation in a tank liquor comprising 40-50g / l of sodium phosphate, 20-25g of sodium tetraborate and 25-30g of sodium hexametaphosphate. The method comprises the following steps: removing oil from the workpiece, washing the workpiece with hot water, washing the workpiece with cold water, removing an oxide film, washing with cold water, carrying out micro-arc oxidation, washing the workpiece with cold water, and drying. The corrosion resistance of an aluminum alloy part is greatly improved, neutral salt mist test is carried out for 1000-3000h, and the corrosion resistance is 1-3 times higher than that of a common anodized film; a Table wear test result shows that the wear resistance is 4.9mg / 10000r, and is 50 times higher than that of hard anodized films; the aluminum alloy part can bear a high temperature of 2000DEG C, and the temperature resistance is 10-20 times higher than that of the common anodized film; the insulation resistance is 1000Momega, and is 10 times higher than that of the common anodized film; and high technical requirements of novel products are met. Products obtained in the invention can be used in all fields with strict technical requirements.

Description

[0001] technical field [0002] The invention relates to an aluminum alloy micro-arc oxidation process and belongs to the technical field of surface treatment methods for metal parts. Background technique [0003] Aluminum alloy materials usually use chemical oxidation, sulfuric acid (chromic acid) anodization, hard anodization and other processes to meet the technical requirements of corrosion resistance, wear resistance, heat resistance, high insulation, etc., and are widely used in the defense industry and Various machinery manufacturing industries, especially in the application of aero-engines, can reduce the weight of the engine and increase the thrust-to-weight ratio. However, with the improvement of the performance requirements of aero-engines, these traditional surface treatment technologies cannot meet the higher technical requirements. Therefore, it is necessary to develop new technologies to improve product performance. Under such a technical background, micro-arc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
CPCC25D11/06
Inventor 杨旭江贾亚洲刘鑫春
Owner GUIZHOU HONGLIN MACHINERY
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