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topic 10883

Stainless steel contamination

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There are any intructions or documents which give intructions to how conserve stainless steel surfaces to avoid contamination (e.g. rust, conctact with c.s. products, dedicated tools, etc.).

Danilo Moro
- Buttrio, Udine, Italy



Best way to avoid rust and contamination of SS from the standpoint of the metal surface itself, is to pickle it before use by immersion in 30% nitric, 6% hydrofluoric, rest water. Then passivate it in 30% nitric acid and water (no hydrofluoric), then neutralize it for use. If contamination has occurred the nitric mix described for passivation will eliminate most of it, if it is ferrous. Neutralization of the acid is nessesary for re-use. Good luck.

Guillermo Marrufo
Monterrey, NL, Mexico



Refer to ASTM A967 [link by ed. to spec at TechStreet] -99. You can do the job simplest and safest with citric acid formulae available on the market.

lee kremer
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Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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