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.

锡板合金锡后在加热熔融处理程中通热扩散在基板与锡之间生成金属间化合物,因此,合金生成与原板和都有很大关系。