The passivation treatment of stainless steel is mainly a rust prevention and corrosion prevention process, because stainless steel materials after a variety of processing (welding, turning, stamping, etc.), the crystal structure and surface roughness of stainless steel materials will change. Therefore, the anti-rust performance is greatly reduced, which leads to the stainless steel material and its easy rust, so it is necessary to do a passivation anti-rust treatment to improve the workpiece's anti-rust performance.
If other surface treatment is done, the passivation layer will be destroyed and the rust prevention ability will be affected.