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

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Passivation watermarks

After pickling and passivation, water marks are generally observed on to the SS equipments. whether these water marks are harmful? kindly answer.

Milind Dharmadhikari
- Pune, India
2007

A. Assuming that the water mark is a salt from your rinse water, try using warm demineralized or RO or DI water and blow the parts dry with oil free compressed air. You may also need to use a wetting agent in the final rinse.

James Watts
- Navarre, Florida
2007

A. Yes, the deposits are very likely harmful and prohibited by passivation specification. Salts and other compounds in the deposits absorb moisture and create electrolyte cells leading to corrosion. This can be verified by high humidity testing.

QQ-P-35C [from DLA] , Paragraph 3.8: "The passivated parts shall be free of iron contamination and other foreign materials that adversely affect the suitability, use or life of the passivated part."

ASTM A967, Paragraph 11.1: "The passivated parts shall exhibit a chemically clean surface..."

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.
2007

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