Does the spring need plating?

Spring is a kind of wire forming hardware accessories made of metal wire processing, according to the different raw materials, some springs can not need electroplating, such as: copper springs, stainless steel springs, springs of other materials need to be electroplated, such as: Iron wire springs, manganese steel springs, etc., because some metal materials will be corroded if they are not isolated from the air for a long time, and contact with the air will make metal materials rust and decay.