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topic 11439

Hydrogen Embrittlement in a Phosphating Process


I have a customer that is requesting a 48 hour containment of product that has been through a phos and irilac top-coat finish to allow for hydrogen embrittlement. Is this necessary for this process? I always thought the amount of hydrogen was so low and phos so porous that hydrogen embrittlement was not an issue.

Deborah Ybarra
springs and stampings - Grand Rapids, Michigan


Hi, Deborah. Your customer is probably concerned that once the finish is on the parts, they will no longer be hydrogen permeable. The 48 hour quarantine is to let the hydrogen get out before the paint or topcoat locks it in.

Whether your customer is actually justified in this concern is another matter :-)
-- and something you might want to discuss with the coating manufacturer.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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