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. 滲碳處理一種冶金鍍膜工序,在此工序中把鋼或鐵浸入另一種金屬如鋅、鉻或鋁的粉劑里,并加熱至這一金屬的熔點(diǎn)溫度以下