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.

锡板合是锡后在加热熔融处理过过热扩散在基板与锡之间生成的一种属间化合物,因此,合的生成与原板和有很大关系。