Conductive anodic oxidation process for aluminum and alloy part

An anodizing and alloying technology, which is applied in the field of surface treatment of aluminum and its alloy components with conductive, conductive anodizing process of aluminum and its alloy parts, welding and anti-rust requirements, which can solve the problems of power consumption and achieve good results Anti-rust performance, simple process method, excellent welding performance

Active Publication Date: 2009-04-15
四川泛华航空仪表电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually H 2 SO 4 Oxidation requires cooling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1. The methods of pre-treatment and post-treatment are carried out according to the process of sulfuric acid anodic oxidation. The preparation of the conductive anodic oxidation solution is prepared according to the components of 3-15g / L chromic acid, 5-20g / L sodium dichromate, and 0.4-12g / L sodium fluoride, among which

[0022] Chromic acid 15g / L, sodium dichromate 20g / L, sodium fluoride 12g / L.

[0023] Anode current density 3A / dm 2

[0024] Anodizing time 10min

[0025] Bath temperature 21°C

[0026] The tank terminal voltage is 16V. The surface resistance measured by EDM=3150 digital multimeter is 87mΩ.

Embodiment 2

[0027] Example 2. The methods of pre-treatment and post-treatment are still carried out according to the process of sulfuric acid anodic oxidation. The preparation of the conductive anodic oxidation solution is prepared according to the components of 3-15g / L chromic acid, 5-20g / L sodium dichromate, and 0.4-12g / L sodium fluoride, among which

[0028] Chromic acid 10g / L, sodium dichromate 15g / L, sodium fluoride 6g / L.

[0029] Anodizing time 20min

[0030] Bath temperature 25°C

[0031] Groove terminal voltage 18V,

[0032] Current density 3A / dm 2 ,

[0033] The surface resistance measured by EDM=3150 digital multimeter is 80mΩ.

Embodiment 3

[0034] Example 3. The methods of pre-treatment and post-treatment are carried out according to the process of sulfuric acid anodic oxidation. The preparation of the conductive anodic oxidation solution is prepared according to the lower limit of 3-15g / L chromic acid, 5-20g / L sodium dichromate, and 0.4-12g / L sodium fluoride, wherein

[0035] Chromic acid 3g / L, sodium dichromate 5g / L, sodium fluoride 0.4g / L.

[0036] Bath temperature 27°C

[0037] Groove terminal voltage 22V,

[0038] Current density 5A / dm2 ,

[0039] Anodizing time 25min. The surface resistance was measured with an EDM=3150 digital multimeter to be 100mΩ.

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Abstract

The invention provides a conductive anode oxidation technology of aluminum and alloy parts thereof, which comprises the following steps: (a) alkaline corrosion: the aluminum and the alloy parts are put into an alkaline solution for removing an oxide skin generated in natural state; (b) bright dipping: the aluminum and the alloy parts are put into 40 to 70 percent nitric acid solution for removing the dust so as to lead the aluminum and the alloy parts to expose metal luster; (c) anode oxidation: the aluminum and the alloy parts are put into a mixed electrolytic solution prepared by chromic salts and villaumite, 10 to 35V of voltage and 0.5 to 5A/dm<2> anodic current density are exerted to the solution at normal temperature, and the time for anode oxidation is 5 to 30min; and (e) drying. A film layer presents slightly transparent rainbow color and is bright, and has smooth and compact appearance. The technology has excellent welding performance, good electric conductivity and better antirust property, and solves the contradiction between the aluminum and the alloy parts, and the electric conductivity and the welding performance.

Description

technical field [0001] The present invention relates to a method for surface treatment of aluminum and its alloy parts, more specifically, the present invention relates to a conductive anodic oxidation process for aluminum and its alloy parts, especially for aluminum and its alloy parts that require electrical conduction, welding and rust prevention. The process of surface treatment of alloy components. Background technique [0002] Aluminum and its alloy parts often need to undergo corresponding surface treatment before use to meet their adaptability and safety to the environment, reduce abrasion and prolong their service life. In the industry, anodic oxidation is more and more widely used to form a thick and dense oxide film layer on the surface of aluminum to significantly change the corrosion resistance of aluminum alloys and improve hardness, wear resistance and decorative properties. After hard anodic oxidation treatment of aluminum and its alloy parts, an oxide film ...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/38
Inventor 李丹龙
Owner 四川泛华航空仪表电器有限公司
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