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.

镀合金层是镀后在加热理程中通热扩散在基层之间生成的一种金属间化合物,因此,合金层的生成原和镀层都有很大关系。