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.

镀板合金层是镀加热熔融处理程中通热扩散基板与层之的一种金属化合物,因此,合金层的与原板和镀层都有很大关系。