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Ted Mooney, P.E. RET
Pine Beach, NJ

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Chemical compositions of metal coatings

2006

Hi I am Murali,
Working in Vignani Tech, Bangalore, India. I am working on an RoHS project.
Can anybody help me to know what Finish will have what material compositions.

Thanks,

Muralidhara
Vignani Technologies - Bangalore, India

Hello, Murali. There are 22 commonly electroplated metals, and many more alloys thereof. Additionally there are hot dip coatings, physical vapor deposition coatings, and many more. There are, assuredly, thousands of different surface coatings and combinations. A better way to proceed would be to start with the list of RoHS regulated substances and then investigate what coatings might include them. But even that is not easy as there are trace amounts of the regulated metals in places that might not be obvious -- for example, electroless nickel coatings traditionally included cadmium and lead contaminants in excess of regulated amounts, and hot dipped zinc coatings traditionally include lead in excess of the limit. And there are other examples. It's not easy.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2006

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