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Gold colored deposit.

By Kushner, Arthur S.
Publication: Products Finishing
Date: Sunday, February 1 2004

Q. We want to plate a non-gold containing alloy as a final finish and in some cases as an underlayer for gold. Do you have any suggestions? M.I.

A. A classic plating bath that has been used specifically for this purpose is as follows: 

Component          Concentration






		

		

		

		

		

		
		
			



		

		

		

		

		

	



Sodium cyanide      8.6 oz/gal
Copper cyanide      4.0 oz/gal
Sodium stannate     4.6 oz/gal
Sodium hydroxide    1.5 oz/gal
Rochelle salts      6.0 oz/gal
Anodes              Pure copper
Temperature         150-160[degrees]F

Very small quantities of lead are sometimes added as a brightener. Keep in mind that this is a cyanide-based plating bath and if you are not equipped to handle a cyanide plating bath this formulation is not suitable for you.

ARTHUR S. KUSHNER

Kushner Electroplating School, Sunnyvale, CA

platingclinic@pfonline.com

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