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. 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 material added in small amounts during a chemical or metallurgical process to absorb impurities. 吸气剂以少量加入化学或冶金过程中用来吸收杂质的物质
