Method for preparing aluminum alloy anti-corrosion layer and electrolyte used in method

Abstract

The invention discloses a method for preparing an aluminum alloy anti-corrosion layer and electrolyte used in the method. According to the invention, through micro-arc oxidization, the formed ceramic film layer is divided into an inner compact layer and an outer loose layer, and the inner compact layer is mainly used for providing protection for a substrate; the outer loose layer is filled by utilizing a closing method, so that the thickness of an isolation layer is effectively improved. According to the invention, the adopted micro-arc oxidization electrolyte and the closing liquid have no substances harmful to human body and environment, and are simple in components, easy to control and stable in process. Through adopting a composite salt system, the obtained ceramic film layer is uniform and compact, and has good resistance on all kinds of corrosive mediums.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface anticorrosion, and in particular relates to a method for preparing an aluminum alloy corrosion-resistant layer by liquid plasma ion pulse high-energy discharge. Background technique [0002] Aluminum alloy has low density, high strength, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance, and is rich in storage capacity, easy to recycle, and has been widely used in automobiles, electronics, communications and the aerospace field. However, in order to further expand the application range of aluminum alloys, the corrosion and protection problems of aluminum alloys must be solved. Aluminum is a metal with high chemical activity among existing structural materials, and its standard electrode potential is -1.67V. The oxide film naturally formed on the surface of the atmosphere is loose and porous,...

AI Technical Summary

Problems solved by technology

However, on the one hand, due to the different properties of the anodized film and the micro-arc oxidation film, the pore size is different (the pore size of the anodized film is nano-scale, and the pore size of the micro-arc oxidation film is micron-scale), it is difficult to imitate the sealing method of the anodized film to achieve micro-arc protection. The good sealing effect of the oxide film can even destroy the ceramic texture of the micro-arc oxidation film

On the other hand, although hydration sealing is simple, effective, and convenient to use, it has high sealing temperature, high energy consumption, and slow sealing speed, especially for high water quality requirements.