Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Yellow patches after passivation
Sir,
We are using RO water in rinsing baths of phosphating plant. Sometimes we get yellow colored coating of phosphate after passivation. Please give suggestion to remove this problem and reason also.
Ravinder Mago- Panchkula, Haryana, India
Hi Ravinder. It sounds a bit non-sequitur to me. It's certainly possible that the RO system is resulting in poor rinsing which could be the cause of your problem, but why is the RO system your very first suspect? I would probably suspect the passivation bath.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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