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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.
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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