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

www.finishing.com is made possible by supporting advertisers ...
this text gets replaced with bannerText

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

No dead threads!
Your Q, A, or Comment puts this thread on The Finishing.com HOTLINE.

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: