A kind of composite additive used for copper plating of chemical replacement on iron surface was investigated.

研究了一种用于钢铁基体化学置换镀铜的专用复合添加剂。

youdao

The reaction of chemical replacement copper plating on iron surface and profile of the coating have been investigated by electrochemical methods and scan electron microscopy.

用电化学方法和扫描电子显微镜研究了钢铁置换镀铜反应及镀层形貌，结果表明：钢铁表面的置换铜镀层总是多孔的。

youdao

Stop chemical reaction caused replacement.

停机化学置换反应造成。

youdao

Nicotine replacement products provide the body with small amounts of the chemical through forms other than cigarettes.

VOA: special.2010.03.09

President Obama had also promised to build a modern Chemical and Metallurgy Research Replacement facility for handling plutonium which was included in the Treaty Resolution of Ratification and presented in his message to the Senate upon entry of the treaty into force.

FORBES: Move up http://i.forbesimg.com t Move down

"Stocks of fire-fighting foam containing this chemical have been phased out at Guernsey Airport now that a suitable replacement has become available, " added Deputy Flouquet.

BBC: Assurances over Guernsey water