The anti-corrosion treatment of the metal screw refers to the application of a maintenance layer on the metal surface by various methods. The function of the metal screw is to isolate the metal from the corrosive environment to suppress the corrosion process or reduce the contact between the corrosive medium and the metal surface. Avoid or mitigate the purpose of corrosion.
The maintenance layer should be able to meet the following requirements:
1, corrosion resistance, wear resistance, high hardness
2. The structure is strict, intact, and the pores are small.
3. It is separated from the base metal and has good adhesion.
4, the average spread and a certain thickness.
The maintenance layer is usually divided into two types: metal coating and non-metal coating. The metal coating refers to the use of a highly corrosion-resistant metal or alloy to form a maintenance layer on the surface of a metal that is easily corroded. This coating is also called a coating. There are quite a number of methods and varieties for producing metal plating, the most common of which is electroplating, followed by molten metal immersion plating (hot dip plating) and chemical surface treatment.
Non-metallic coating refers to the use of organic polymer materials such as paint, and inorganic materials such as ceramics to form a maintenance layer on the surface of metal equipment or parts. The maintenance layer can completely separate the base metal from the environmental medium to avoid contact corrosion of the base metal. Corrosion forms in the stainless steel standard part media.