Surface treatment of Aluminium alloy
Aluminium alloy is an important material in modern industry, and its surface treatment plays an irreplaceable role in the application of this material. The surface treatment of aluminium alloy can be divided into chemical, mechanical, physical and electrochemical treatment methods.
Chemical treatment. Chemical treatment methods mainly include chemical oxidation, anodizing, etc. Chemical oxidation treatment is a method of chemical conversion under the action of chemical agents to make the surface of the material have a certain degree of oxidation resistance and other properties. In general, a chemical oxidation solution containing a certain amount of acid or base and oxidant is used. Anodizing is mainly used to make the surface of alloy have certain electric insulation performance, wear resistance and corrosion resistance, and some anodizing liquid also makes it possible to obtain color effects.
Mechanical treatment. Mechanical treatment methods refer to the improvement of surface properties of materials by mechanical surface modification, such as polishing and honing. The mechanical modification of these processes generally has no significant changes in surface composition, but the surface hardness, roughness and smoothness of the parts have significant changes.
Physical treatment. Physical treatment includes surface plating and organic coating, etc. The alloy surface is plated and sprayed with a layer of metal or its compound, so that the surface can be given a certain degree of hardness, wear resistance and corrosion resistance, and warm appearance. And organic coating is used for painting, electrostatic powder spraying and electrodeposition, etc., which can improve the corrosion resistance, wear resistance, flame retardancy and adhesion of the alloy surface.
Electrochemical treatment. Electrochemical treatment includes electroplating, electrolysis and electroforming processes, etc. Generally, these processes use electric current to modify the surface of metals and alloys and obtain a variety of functional surface layers. Electroplating processes can be used to obtain a protective surface layer with extremely high corrosion resistance, as well as a decorative effect.
In conclusion, the surface treatment of aluminium alloy is complex and numerous, and usually needs to be combined with the application of materials, so that the surface of aluminium alloy can be effectively improved and the performance of aluminium alloy can be better utilized.
