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Letter 37071
De Carbonator for Silver Plating Baths
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We are Bombay based Electroplaters doing 5 and 10 Micron Silver
Plating on Copper Rollers for L & T.
We need Decarbonators for reducing the carbon in the Silver plating
baths, due to which the efficiency of the bath is reducing.
Kindly suggest the possible method to solve the problem.
Thanks & regards,
HEMAL NAGDA
KIRAN ELECTROPLATERS - MUMBAI , MAHARASHTRA , INDIA
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A bit of an English problem on part of your request. Your problem
is carbonate, not carbon. A silver bath that uses sodium cyanide and
sodium hydroxide can freeze out carbonates on a very cold coil or
possibly a cold finger (if you are a chemist). The solubility of
sodium carbonate is that in a cold tank with a near freezing coil or
similar apparatus, sodium carbonate crystals will form and
temporarily stick to the cold device because you have reached a point
beyond the saturation point. This does remove a small amount of
trapped bath chemicals, but not bad. The coil is needed as if you
just precipitate it out, the flow rate of filtration and the rising
temperature will redissolve it. Metal finishing vendors sell these
things.
This does not apply for a potassium based bath because the much
higher solubility of potassium carbonate at any temperature. For this
you are going to have to bail out part of the tank--Not cheap.
James Watts
- Navarre, Florida
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Hi!
You can find appropriate equipment on internet, if you "Google" it
with key-word "carbonate removal"!
Dimitrij Us
- Kranj, Slovenija (EU)
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