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Non-RoHS stainless steel?

2006

Hello, I'm in the middle of RoHS compliance review for a chassis (I'm an electrical engineer, but I've inherited the mechanical design for this device).

Anyway, some of our vendors say that some stainless steel parts are not RoHS compliant. How can this be? I know that one way of passivating stainless steel is with a nitric acid + sodium dichromate solution. But even so,I thought that this left a chromium (III) oxide layer.

Is the concern left over passivation bath?

Joe Allen

2006

Said vendors perhaps lack knowledge of chemistry, passivation or RoHS. Check their procedures.
Chemical passivation specifications require thorough rinsing in clean water, e.g., ASTM A967 [affil link] paragraph 6.2. Final rinse is preferably DI water to avoid staining and chloride residue from tapwater.

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

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