plating, anodizing, & finishing Q&As since 1989
Non-RoHS stainless steel?
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?
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.
- Goleta, California
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