Biological treatment oxidation process for aluminum substrate

Abstract

The invention relates to a method using biological oxidation. An aluminum substrate is treated through acidophilic bacteria in an acid environment and is washed with circulation water, so that a compact alumina film is formed on the aluminum substrate. High-pollution and high-energy-consumption inorganic chemical oxidation and electro-oxidation are avoided, a compact aluminum oxide layer is formedon the surface of the aluminum substrate, higher insulation and heat conduction properties are achieved, the compact oxide layer has the characteristics of uniformity, stability and consistency, theheat conduction and insulation properties of an aluminum-based copper clad plate are greatly improved, and industrial pollution and energy loss are not generated.

Description

technical field

[0001] The invention relates to a surface treatment method of an aluminum plate. Background technique

[0002] In the production process of the aluminum substrate, the aluminum surface needs to be oxidized to form an aluminum oxide oxide layer. Aluminum alloy surface treatment usually adopts anodizing, chemical conversion treatment, electroplating and micro-arc oxidation. The oxide film obtained by chemical oxidation of aluminum and aluminum alloy parts has a thickness of about 0.5-4 μm, poor wear resistance, and corrosion resistance is lower than that of anodic oxide film, so it should not be used alone; but it has certain corrosion resistance and good physical adsorption. Ability, is a good primer for painting.

[0003] CN1039626A discloses a chemical oxidation method of aluminum and alloys, a. The chemical oxidation solution is composed of 3.7-6.7 g / L chromic anhydride, 1-3 g / L fluoride, 0.5-0.05 g / L potassium ferricyanide, surface active Agent 0.5-3 g / ...