Letter 051

Materials of construction for passivation process

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I have been asked to provide the proper equipment for Passivating of 300 series Stainless Steel. The passivate solution is Nitric acid and run at 150 deg. F. We would like to bulk passivate and was wondering what material of construction you would recommend for the bulk processing of these parts. I thought there might be a possible problem having two dissimilar metals in the Passivate. Do you have any suggestions? Thanks.  

N. Corriere

Like they always say, coupon testing is the only way to know for sure because there can always be some little idiosyncrasy you missed. But I'd be very surprised if 316SS didn't fill the bill perfectly in all regards.

Ted Mooney, P.E.  finishing.com Brick, NJ

we always used polypro for tanks and baskets.   thanks,     

Ron landrette

Could be, Ron, but I don't think it's the best stuff for the tanks.

Ted Mooney, P.E. 
finishing.com
Brick, NJ

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