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

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REMEDY FOR PARTS WITH HYDROGEN EMBRITTLEMENT

Q. I have a situation where our company manufactured some parts out of 41l40 HR Alloy and sent them to be zinc plated and baked. Upon return, numerous samples of the part broke under load and it was obvious that the parts were not baked. Per the ASTM spec too much time has passed to bake the parts, however, is it possible to strip the parts, re zinc them and then bake to remove the brittleness?

Roger Eaton
- Havelock, North Carolina, USA
June 1, 2012

A. Basically, no! The damage has been done.

James Watts
- Navarre, Florida
June 1, 2012

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