What causes surface corrosion of precision seamless tubes?
There are two main factors that cause surface corrosion of precision seamless pipes: chemical corrosion and electrochemical corrosion. (1) Chemical corrosion 1. Surface contamination: oil, dust, acid, alkali, salt, etc. attached to the surface of the workpiece are transformed into corrosive media under certain conditions, and chemically react with certain components in the stainless steel parts, resulting in chemical corrosion and rust. 2. Surface scratches: All kinds of scratches damage the passivation film, which reduces the protective ability of stainless steel, and is easy to react with chemical media, resulting in chemical corrosion and rust. 3. Cleaning: After pickling and passivation, the remaining liquid will remain and the stainless steel will be directly corroded (chemical corrosion) if the cleaning is not clean. (2) Electrochemical corrosion 1. Carbon steel pollution: scratches and corrosive media caused by contact with carbon steel parts form galvanic cel...