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topic 61235

Chromium in my Anodizing Waste?

April 14, 2021

Q. I am running a sulfuric acid anodize line anodizing 6061 and 7075. I have a problem with very high levels of chromium in our waste (A highly regulated RCRA metal in the US). We currently ship this off as Hazardous Waste. As I read through the forum, nobody seems to have this problem. I can't imagine that I am the only anodizer with this problem. Or maybe nobody else has tested their waste for RCRA metals? Anyone have any ideas where this might be coming from?

Randy H.
- Sanford, North Carolina
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April 2021

A. Hi Randy. Assuming you are doing no chromate conversion coating (Alodine. Iridite), no chromic acid anodizing along with your sulfuric acid anodizing, and no chrome sealing, I don't understand it either.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
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