Stainless steel refers to steel that is resistant to weak corrosive media such as air, steam, and water, as well as chemical corrosive media such as acid, alkali, and salt. It is also known as stainless acid resistant steel. In practical applications, steel that is resistant to weak corrosive media is often referred to as stainless steel, while steel that is resistant to chemical media is referred to as acid resistant steel. Due to the difference in chemical composition between the two, the former may not be resistant to chemical corrosion, while the latter generally has non rusting properties. The corrosion resistance of stainless steel depends on the alloy elements contained in the steel. The basic alloying elements of stainless steel include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various applications for the microstructure and properties of stainless steel. Stainless steel is prone to corrosion by chloride ions because chromium, nickel, and chlorine are isotopes, which undergo exchange and assimilation to form corrosion of stainless steel.