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Re-plating parts that have holidays





November 29, 2011

What is the procedure for re-plating steel parts made from 12L14 bars without causing hydrogen embrittlement?

Bob ABLONDI
Technical Consultant - Ann Arbor, Michigan



November 29, 2011

Hi, Bob.

To my knowledge, 12L14 is a soft, free-machining steel which would not be subject to hydrogen embrittlement due to low carbon content and lack of hardness. But I don't know what you mean by holidays in this context, or what the components are plated with, etc.

I'm guessing that you mean the plating was unsatisfactory (should have been rejected) and that you want to strip it and re-do it. Generally that is not a problem, although it is possible to accidentally pretty much ruin the steel during pretreatment, so there are sometimes parts that can't be practically salvaged.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey



November 29, 2011

I go along with what Ted said. But, I would fix the cause which is the L IE: lead in the alloy. You will need to go to a fluoboric acid or mixture to remove / activate the lead. No other mineral acid will do it.

James Watts
- Navarre, Florida



November 30, 2011

Good afternoon:
The only reason I can think that hydrogen embrittlement is a concern would be if the parts were case hardened. If you have a copy of the print, maybe they have the heat treat and finishing specs listed?

Steve Bizub
- St Louis, Missouri


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