Metal finishing Q&As since 1989
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Is acid zinc cobalt successfully used for barrel plating?
June 24, 2008
Is acid zinc cobalt successful for barrel?
What should be standard cobalt percentage in bath for blue, yellow, black, olive green passivation?
How much Neutral salt spray can one get?(White and red both)
Researcher - Aurangabad, Maharashtra, India
June 29, 2008
Dear Vipul Duse,
Yes possible.
Pl.give us the specification you are looking for.
Pl. do not expect to give a narration of the subject as it is vast.
I will be able to tell you the excact requirement of Cobalt required if I know wbout what you are looking for.
Regards,
T.K. Mohan
plating process supplier - Mumbai, India
July 9, 2008
Dear Mr Vipul,
The answers to your question are as below:
Yes it is widely used all over the world; available locally as well.
About 3 - 4 % of cobalt alloy in the bath gets you about 1 % in the final plated alloy, the remainder is zinc.
Talking about the acid cobalt process; the white rust resistance is about the same as normal chloride plated zinc if you passivate with Hex Blue. A very slight increase of about 10 hours is observed on Hex black and olive drab. On Hex yellow a phenomenal 100% increase in WRR is normal.
For Red Rust you can expect double the performance for all types of Hex Passivates.
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
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