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Nonferrous topics such as copper and aluminum, annealing, etc. go here.

TOPIC: Copper wire drawing air quality

Copper wire drawing air quality 1 week 1 day ago #3072

We Received the following at our offices and have posted it here.

We are one of the leading manufacture of Building wires and cable in India.
We want to test the ambient air quality for our factory premises for the purpose of copper reacts with the open air wire surface color ( It may be blackish Or Reddish) .
Please advise the any test to be conduct through third party environment lab and any particular elements check for precaution for copper wire drawing manufacturing.
Early action highly appreciated.
Awaiting for your reply ,

Thanks & Regards
Senthilkumar.K
Manager Quality
Regards,
Peter J. Stewart-Hay Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Last Edit: 1 week 1 day ago by Peter J Stewart-Hay.
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Copper wire drawing air quality 1 week 1 day ago #3073

There have been a number of threads on copper wire discoloration in the Forums.

We therefore refer you to the following threads over the past five or six years.

www.wirenet.org/wai-forums/8-nonferrous/...opper-wire-tarnished
www.wirenet.org/wai-forums/5-electrical/...-tarnished-after-pvc
www.wirenet.org/wai-forums/5-electrical/...vc-insulating-part-2
www.wirenet.org/wai-forums/5-electrical/...-tarnished-after-pvc

Copper(I) Oxide, Cuprous Oxide, Cuprite or Red Copper Oxide (CuO2)
Cuprous Oxide can easily coat the conductor and it is a brownish-red solid. The chemical formula is CuO2 meaning two oxygen atoms combine with one copper atom. (Cu + O2 = CuO2). On copper wire, you can see the cuprous oxide layer in full color as various shades of reds, oranges, pinks, and purples if the copper has been heated too high (Above about 200 degrees Celsius (392 Fahrenheit) and exposed to oxygen. Moreover keep in mind that when copper is hot, it quickly oxidizes (corrodes or rusts) and this is nothing more than a simple chemical reaction with oxygen.

On the other hand:
Copper(II) Oxide, Cupric Oxide (CuO)
Cupric Oxide can as well easily coat the conductor and it is a black solid. It can be formed by heating copper in air at around 300 - 800°C:

This is a good starting spot for your issues.
Regards,
Peter J. Stewart-Hay Principal
Stewart-Hay Associates
www.Stewart-Hay.com
This email address is being protected from spambots. You need JavaScript enabled to view it.
The administrator has disabled public write access.
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