Stainless steel (Stainless Steel) refers to the resistance of air, steam, water and other weak corrosive medium and acid, alkali, salt and other chemical etching medium corrosion of steel, resistant stainless steel. Practical applications, often referred to as the weak corrosion medium corrosion of steel stainless steel, resistance to chemical corrosion of steel known as acid-resistant steel. Due to both differences in the chemical composition, the former does not necessarily chemical resistance corrosion, while the latter generally has a stainless steel. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel. Stainless steel alloying elements as well as nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the various requirements of the use of stainless steel microstructure and properties. Stainless steel is easy to chloride ion etching, as chromium, nickel, chlorine is the same bit of the original pigment, of the same elements will be interchangeable assimilation thereby forming a stainless steel corrosion.