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.

镀锡板合镀锡后在加热熔融处理程中通热扩散在基板与锡之间生成的属间化合物,因此,合的生成与原板和镀都有很大关系。