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topic 5147

Brass Plating


I am having hard time to get information about Brass Plating for metal rubber bonding.

Suha Kahraman
- izmir Turkey


Why do you need to do brass plating? Brass plating most times has a lacquer seal of some type, to prevent tarnishing. What is the configuration of the part? Maybe the seal causes problem.

Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan


You are quite correct that brass is plated as a base for the adhesion of rubber or equiv. seals. Generally what is desired is a rapid build up of dense brass. A top coat such as lacquer is not required, however the gasket needs to be adhered before oxidation becomes apparent. Tarnish preventers can be used to extend this time.

Typically the process solution consists of about 5 o.p.g. of Copper Cyanide, 2 o.p.g. Zinc Cyanide, 2.4 o.p.g. Free Sodium Cyanide and a conductivity and anode corrosion additive (proprietary) or Rochelle Salts. Proprietary grain refiners are used to get dense non porous smooth deposits. Wetting agents are used to reduce spray and for a synergistic grain refining effect.

Gene Packman
process supplier - Great Neck, New York

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