Haze problem in Chrome plating
May 23, 2012Q. I have been in the plating business for 35+ years. I have been a hands on person plating just about every metal you could think about. So I have done trouble shooting over the years. Currently I am having a problem with a haze in the low current density area on flat surfaces. I have tried raising and lowering the temperature, raising and lower the current with know success. I am currently working with a hull cell raising and lowering the sulfate. We have omitted any pre-plate so we know it's in the Chrome. Any ideas out there?
Warren Levy- Danbury, Connecticut, USA
A. Some possibilities: Increased rectifier ripple? Intermittent contact? High chloride?
Are you using a fluoride catalyst? Boric acid supplemental catalyst? Fume control agent?
IS throwing power decreased? Are you entering at full current? Does amperage drop off during plating?
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Jeffrey Holmes, CEF - Spartanburg, South Carolina |
A. Haze problem was eliminated by the addition of Barium to reducing the sulfate.
Warren Levy- Danbury, Connecticut, USA
A. Hi,
Check the rectifier for the DC current, maybe you have some AC current in it. Also the chloride content can be a little too high.
Regards
Anders Sundman
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Anders Sundman surface finishing engineer Sweden |
