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topic 15889

Copper oxidation inhibitor

A discussion started in 2002 & continuing through 2017


Q. Dear Sir / Madam,

We are manufacturers of copper wires and strips by cold rolling operation for use in electrical industry and for further insulation. At the time of production, our strips are bright and have a mirror finish. This luster fades away and the surface gradually becomes tarnished. At present we are not using any copper brightener or oxidation inhibitor. (We use continuous cast copper rod electrolytic grade and have no acid picking required in our process). Please suggest the suitable chemical treatment that we should adopt for a long lasting luster and also kindly suggest its method of application.


Vimlesh Jaju
Vimlesh Industries Private Limited - Sonepat, Haryana, INDIA


A. Hi Vimlesh. Read up on benzotriazole, which can probably be applied by simple immersion. Good luck.

Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


Q. I am planning to start the wire drawing setup for copper wire, which type of oxidation inhibitor should I use. Please suggest me.



Neetu Mahaldar
- Gurgaon, Haryana, India

October 11, 2017

A. Hi

As a good background to the chemistry of copper oxidation/tarnishing please see....

This covers Benzotriazole but more importantly I think it gives a good overview on the mechanisms of copper corrosion and tarnishing.

I know this is an old thread but we all stumble into old threads via Google so I believe it is still worth posting.

Jon Light
- Wexford, Ireland

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