Stainless steel is a material that is not easily corroded except in some serious cases. Because corrosion of stainless steel sheet may affect its normal use, we need to take some preventive measures to avoid this happening. Let us first understand what are the factors that cause corrosion of stainless steel sheets?

1) Electrochemical Corrosion

Stainless steel due to contact with carbon steel parts caused by scratch, after the formation of galvanic cell with corrosive medium which will produce electrochemical corrosion. If the effect of pickling passivation is not good, the passivation film on the surface of the sheet will be uneven or too thin, which is also easy to produce electrochemical corrosion. Slag, splash and other easy to rust substances attached to the sheet, and then form a galvanic cell with the corrosive medium, resulting in electrochemical decay. Pickling passivation cleaning is not clean, which leads to the chemical corrosion products between the remaining pickling passivation residue and the sheet, and then the electrochemical corrosion is formed with the sheet.

2) Chemical Corrosion

Under certain conditions many attached to the surface of stainless steel sheet oil, dust or acid, alkali, salt will be converted into corrosive medium, and some components of the sheet chemical reaction, resulting in chemical corrosion and rust. Cleaning and pickling passivation is not clean enough to cause residual liquid retention, thus directly corroding the sheet. The surface of the sheet is scratched, which leads to the destruction of the passivation film, so that the protection ability of the plate is reduced, easy to react with the chemical medium, chemical corrosion and rust.