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Masking against hydrogen embrittlrment

Masking against hydrogen embrittlrment

Masking against hydrogen embrittlrment

(OP)
I have an 4340 steel part heat treated to 160-180 ksi but locally on small area it has a hard case 60-65 RC (flame or induction hardening). I would like to zinc coat it except the hard case area. What is the common way to mask/protect the hard cased area from hydrogen penetration during the zinc coating. The part will be baked against hydrogen embrittlement after the coating.

RE: Masking against hydrogen embrittlrment

I believe copper plating is the preferred method.

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