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.

镀锡层是镀锡后在加热熔融处理程中通热扩散在基与锡层之生成的一种化物,因此,层的生成与原和镀层都有很大关系。