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.

镀金层是镀后在加热熔融处理程中通热扩散在基与层之生成的一种金属物,因此,金层的生成与原和镀层都有很大关系。