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Letter 4076
Brass plating is too yellow, need
gold color
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We do Nickel/Brass Plating in an automatic barrel line.
The color of our brass is lemon/yellow.
Our customer wants a golden color brass.
Any suggestions on chemical composition to achieve a golden color
brass.
Ed Esposito
- jersey city, New Jersey
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Good Morning ,
Many years ago.... I ran bright brass , to look like a gold
finish. cyanide copper / bright nickel [must be bright] to brass
plate , just a flash over , with a "sealer" style dip
afterwards....finish very close to gold.
Hope this helps ,
Ron Landrette
plating equipment supplier - Bristol, Connecticut
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Dear Mr.Esposito,
After a long experience, I learned that the lemon/yellow brass
bath is one of the most stable brass baths, except perhaps of the
"white brass" solutions. Any attempt to modify this standard color of
the deposit, by changing the concentration of some constituents, will
result in unstable colors of the coating and many head aches. For
automatic production there is no other solution. If your customer
wants another tint of the deposit, you may choose between light
bronze coloring ( antiquing )the deposit or applying a colored
transparent solvent lacquer.
Depending of the nature of the plated objects, I think that the
alternative to apply a very thin ( 0.06 - 0.08 µm ) layer of
gold from an acid gold-cobalt bath, after nickel plating, is not be
neglected. Apparently this is more expensive, but if you put in
balance the cost of frequent analysis of the brass bath ,of the
passivation and lacquering of the deposit and of the destruction of
cyanides,gold plating may be the best treatment- for which you may
also ask a better payment.
Best regards,
Emmanuel Popesco
- France
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