Ted Mooney, P.E. RET
- Pine Beach, NJ
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for Metal Finishing since 1989
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Cadmium Density vs. Plating Speed
Q. Hello Folks, Can anyone tell me if there is a correlation between plating speed and density of deposition of cadmium? We are using an alkali cadmium cyanide bath, with nickel sulphate added as brightener. I ask this as i want to understand the correlation between coating density and the likelihood hydrogen embrittlement of test pieces. Thanks and best regards,
Mark Lees- A bright and shining rock in the Irish Sea
November 12, 2024
by William Safranek
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A. Hi Mark.
I'm not aware of much literature on that subject, and after brighteners have been brought into play I'm not sure that plating speed has that much influence anymore.
However, Safranek says "a cyanide solution with no organic additives or contamination is used at high current densities to produce a porous deposit." ⇨
He references MIL-STD-870 and an article by G.T. Sink, "A Low Embrittlement Cadmium Plating Process" from Plating Vol. 55, p. 449-455, 1968.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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