Conductive anodic oxidation process for aluminum and alloy part

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 ...