Common metal surface treatment
Electroplating: A plated metal or other insoluble material is used as the anode, and the work piece to be plated is used as a cathode, and the cation of the plated metal is reduced on the surface of the work piece to be plated to form a plating layer. In order to eliminate the interference of other cations and make the coating uniform and firm, it is necessary to use a solution containing a plating metal cation as a plating solution in order to maintain the concentration of the plating metal cation unchanged. The purpose of electroplating is to plate a metal coating on the substrate to change the nature or size of the substrate surface. Electroplating enhances the corrosion resistance of the metal (more corrosion-resistant metals are used for the plating metal), increases hardness, prevents abrasion, improves electrical conductivity, lubricity, heat resistance, and aesthetic appearance.
Galvanizing: Galvanizing is a surface treatment technique that coats the surface of metals, alloys, or other materials with a layer of zinc for aesthetics and rust prevention. The main method now used is hot-dip galvanizing.
Blackening: The surface of steel parts is blackened and also called blue. The principle is to quickly oxidize the surface of steel products to form a dense oxide film protective layer and improve the rust resistance of steel parts. The blackening process is now commonly used methods are the traditional alkaline warm black and the emergence of a later two kinds of room temperature black. However, the normal temperature blackening process is not very effective for low carbon steels. A3 steel with alkaline black better. The Fe3O4 oxidized at a high temperature (about 550°C) is azure blue, so it is called blue. The Fe3O4 formed at a low temperature (about 3500C) is dark black and is called blackening treatment. In the manufacture of weapons, blue is commonly used; in industrial production, blackening is commonly used.