The alloy layer of tinplate is an intermetallic compound formed between base plate and tin coating through thermodiffusion during the treatment of heating and fusing after electrotinning.

镀锡板合金层是镀锡热熔融处理程中通热扩散基板与锡层成的一种金属化合物,因此,合金层的成与原板和镀层都有很大关系。