For the spring, people commonly use plating for xin is a protective layer. It has the characteristics of no corrosion, and can greatly improve the appearance of the spring. For spring work performance also made certain improvement, such as can improve the surface hardness or is the ability to increase resistance to wear, and improve the performance of the thermal stability and so on. And spring using zinc coating, zinc in the dry air is very stable, almost don't have any change, so the general galvanized layer corrosion protective coating for spring under atmospheric conditions, but if in and sulphuric acid, hydrochloric acid, caustic soda and sulphur trioxide place to work, don't recommend the use of zinc coating. If spring is used in the sea or the heat in the atmosphere, cadmium is a very good ?

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