The electrochemical polishing process is divided into two steps: (1) macro leveling: the dissolved product diffuses into the electrolyte, the geometric roughness of the material surface decreases, and there is a low illumination level of RAL μm(2): anodic polarization improves the surface brightness.
Electrolytic polishing: With acidic electrolyte (strong acid), put the sample to be polished in and apply current (about 7mA), and the anode dissolves. Because of the current, the protruding part dissolves faster and the surface tends to be flat, thus achieving the final polishing effect (the effect can be seen in about 10 minutes). The basic principle of electrolytic polishing, like chemical polishing, is to make the surface smooth by selectively dissolving the tiny protrusions on the surface of the material. Compared with chemical polishing, it can eliminate the influence of cathode reaction and has better effect.
Mechanical polishing: For stainless steel plate with rough surface, it is necessary to polish the roller frame with abrasive belt polishing machine. First use 120# abrasive belt, then replace it with 240# abrasive belt, and then replace it with 1200# abrasive belt until the surface color reaches one.