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topic 60379

Chloride stain mark on chrome surface

January 31, 2017

Q. Hello, we are carrying out chrome plating on plastic material. We have observed dotted stain mark on chrome surface after part storage for one month. After analysis in a lab for the stain mark element it was detected presence of Cl, i.e., Chloride. what are possible causes for the presence of chloride on chrome plated surface?

Dinu Bhokare
Sr.Quality Assurance Manager - Pune,India

May 9, 2017

A. I'd suggest it would have to come from the final rinse waters.
Make final rinse in DI water.

Geoffrey Whitelaw
Geoffrey Whitelaw
- Port Melbourne, Australia

June 29, 2017

A. Hi Dinu,

chloride stain on chrome plated surface, hydrochloric acid or chloride related chemical drain into your chrome tank, from the broken rack, or some other reason
1) remove chloride from chrome, dummy bath or decant solution then readjust chemistry
2) silver nitrate take your chloride out and filter out, this method is expensive.

Howard Finishing LLC - Roseville, Michigan

July 13, 2017

A. Hi,

I think it comes from how you store the part.

Best regards

anders sundman
Anders Sundman
3rd Generation in Plating
Consultant - Arvika, Sweden

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