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What are the factors that cause corrosion of stainless steel plates

DateTime:2021-10-23Sources:Valin Special SteelViews:

Stainless steel plate is actually a product that is not easy to cause corrosion. Unless it is some serious situation, it is impossible for any product to be protected from corrosion. If our stainless steel plate is corroded, it may affect its normality. Use, so we still need to take some preventive measures in order to avoid this situation. Let’s first understand the factors that cause corrosion of stainless steel plates?

1、Electrochemical corrosion

The scratches caused by the contact between the stainless steel sheet and the carbon steel parts, and then form a galvanic cell with the corrosive medium, which will cause electrochemical corrosion. If the pickling passivation effect is not good, the passivation film on the surface of the plate will be uneven or too thin, which will easily cause electrochemical corrosion, cutting slag, splash and other rusty substances to adhere to the plate, and then form with corrosive media The primary battery, which produces electrochemical corrosion. Unclean pickling passivation cleaning results in chemical corrosion products between the remaining pickling passivation residue and the plate, and then electrochemical corrosion with the plate.

2、Chemical corrosion

Under certain conditions, a lot of oil, dust, acid, alkali, salt, etc. adhering to the surface of the stainless steel sheet will be converted into corrosive media and chemically react with some components in the sheet, resulting in chemical corrosion and rust. The cleaning and pickling passivation is not clean enough to cause residual liquid to remain, which directly corrodes the plate. The surface of the plate is scratched, which leads to the destruction of the passivation film, so that the protective ability of the plate is reduced, and it is easy to react with the chemical medium, resulting in chemical corrosion and rust.