Letter 8011

Black oxide cause of Hydrogen embrittlement? 

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Can a black oxide finish induce Hydrogen embrittlement on a steel part? I understand that zinc plating can be a cause, but question the possibility of black oxide.

Claudia Dougherty
- Sarasota, FL, USA

I think that the black oxide step per se would probably not cause hydrogen embrittlement, but any acid immersion in the preparatory steps well might.

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

I have seen and experienced in our failure assessments that the Hydrogen,generated from the Schikorr reaction in boilers (which is responsible for the black oxide (magnetite)) resulted in hydrogen embrittlement if the local hardness in the area of welds or internals is above 250 hardness Vickers

Harry Schrijen
- Hoensbroek, Netherlands

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