渗碳处理一种冶金镀膜工序，在此工序中把钢或铁浸入另一种金属如锌、铬或铝的粉剂里，并加热至这一金属的熔点温度以下

A metallurgical coating process in which iron or steel is immersed in a powder of another metal, such as zinc, chromium, or aluminum, and heated to a temperature below the melting point of either.