Process for manufacturing plated springs

摘要

Disclosed is a color-developing metal product for spring plated on the surface with alternate layers of Cu and Zn to be alloyed by thermal diffusion at low temperatures after spring-forming, and a method of using a color-developing plated metal products comprising the steps of : applying two-layer plating of a lower layer of Cu and an upper layer of Zn on the surface of a spring material to the extent that the thickness ratio of a Zn layer to the whole thickness of the plating is within the range from 5 to 45 % ; forming the plated spring steel material into a spring material having a final plating thickness of 2-25 mu m and spring-forming it; heating the spring-formed spring material at 250-400 DEG C for low temperature annealing thereby alloying the plating layer to be colored.