Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

The authoritative public forum
for Metal Finishing since 1989
-----

302 passivated stainless steel turns black

I have 304 and 302 passivated stainless steel bolts that turn black, but not all the time.
Any reason for the inconsistency?

Greg Stoermer
Restorer - Milwaukee, Wisconsin
November 30, 2010

December 16, 2010

Greg,
Probably, but without more information from you it's hard to hazard a guess. How quickly do they turn black and what chemicals are they exposed to?

Ray Kremer
Stellar Solutions, Inc.

McHenry, Illinois

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: