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Second De Embrittlement required after plating?

If a bolt has been de-embrittled for 8 hours, and is then electro zinc plated does the bolt need to be re de-embrittled? if so for how long! many thank,

Charlie Nictone-Bantor

2006

2006

Yes, if the tensile strength is 1200* MPa, it shall be baked at 190* C for 3* hours within 4 hours of plating (and prior to chromating or other supplemental treatment) -- ASTM B633.
*or greater.

Note that hydrogen embrittlement relief baking is preventative; 'de-embrittlement' suggests that damage can be undone. Or, is that UK terminology?

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

Yes, it is English terminology commonly used in place of embrittlement relief.

Brian Terry

2006

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