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

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Passivation and Hydrogen Embrittlement

According to ASTM A380 section A2.4: Hardenable 400 series, maraging and precipitation-hardening alloys in the hardened condition are subject to hydrogen embrittlement or intergranular attack when exposed to acids...parts should be heated at 250 and 300°F for 24 h immediately following acid cleaning to drive off hydrogen and reduce susceptibility to embrittlement.

My question is, whether it is necessary to perform such a baking process after passivation and is there evidence of passivation causing hydrogen embrittlement? I can't seem to find any supporting documentation for this.

Rocco Varano
Materials and Process Engineer - Lonqueil, QC, Canada
2007

My advice is to contact Cartech on this subject, as they have done a lot of work in this area.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2007

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