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Why did our brass parts turn reddish brown?

February 22, 2017

Q. We are using brass material for our products. brass material colour changed to reddish / brown during our assembly. what will be cause for the colour change. Kindly give your suggestion to arrest the colour change on the brass material.

- Coimbatore, tamilnadu, India

February 2017

A. Hi cousin Siva. It's anybody's guess what alloy your parts are made of, what environment you have placed them in, etc. But brass always tarnishes, and usually quite quickly. If you want it to retain a shiny gold look, a dip in sodium benzotriazole will help for a while in a favorable environment, but brass lacquer or another type of clear coat is certainly required for the longer term and if the parts will not remain in climate controlled conditions. Good luck.


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

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