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Why does part become too brittle after the de-embrittlement process? What should I do?

I work in the automotive industry and having problem with part (Zinc plated and gone thru the de-embrittlement process. During assembly of this part, the tang on the part is too brittle and broken off during the assembly process.Please advise.

Raymond Goh
Quality Engineer - Melbourne, Australia
2007

Hydrogen embrittlement damage occurs quickly and is permanent, Raymond. You must do the baking almost immediately -- how much time actually elapsed?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted can be retained for immediate
answers or long term project help
2007

2007

What Ted said is extremely true.
Next, is the part properly designed? Try mounting a couple dozen unplated parts and see how many break.
Next, you may need to do a pre-bake or a shot peening process.
But normally, if the parts are in the oven within 30 minutes and spend 4 hours with the parts at 375F, you should have no problem. Spending too long in the acid etch is another common cause.

James Watts
- Navarre, Florida

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