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  for Metal Finishing since 1989
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Hydrogen Embrittlement in HSLA Steels

I am using HSLA 970 Steel in an application. The material is non heat treated. For corrosion protection, I'm using trivalent chrome. I've been informed that during the cleaning process, prior to plating, hydrogen embrittlement may be introduced. The cleaning is in an acid with temperature. If this can occur? How may I minimixe the effects of HE?

D Michelson
1st tier automotive - Rochester Hills, Michigan
2003

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First of two simultaneous responses --

Hydrogen embrittlement is a concern only for very high strength steels-- heat-treated or strain hardened (cold worked) to a surface hardness exceeding 320 HV (~ 32HRC). HSLA steels are not susceptible to hydrogen embrittlement. You can find more information on hydrogen embrittlement relief by performing a search of the archives on this site, or by reviewing standards such as SAE USCAR 5 and ASTM B850-98.

Toby Padfield
Automotive module supplier - Troy, Michigan
2003

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Second of two simultaneous responses -- 2003

Dear sir, looking for good result.

* anodic cleaning than cathode cleaning
* using inhibitor in acid bath.
* blasting than acid cleaning(high carbon).
* acid bath and then alkaline treatment with high temp.

SE DO JANG
- KOREA