What is metal surface treatment?

There are two aspects of metal surface treatment. One is surface protection, which is used to prevent metal corrosion. The commonly used surface protection methods include surface coating and surface conversion film technology. On the other hand, metal surface modification, also known as surface optimization, It is to change the composition, structure and properties of material surface and near surface with the help of ion beam, laser, plasma and other new technologies, so as to obtain new thin-layer materials that can not be obtained by traditional metallurgy and surface treatment technology, or make traditional materials have better performance. Modern surface modification technologies include physical vapor deposition (PVD), chemical vapor deposition (CVD), plasma chemical vapor deposition (PCVD), ion implantation and ion beam deposition.
Surface quenching does not belong to surface treatment, belongs to surface heat treatment process, is a kind of heat treatment, and is not a concept with surface treatment.