Zinc Cobalt Electroplating

Zinc-cobalt is one of the alloy plating processes developed in the nineties to replace cadmium and to provide enhanced corrosion resistance. It has greater corrosion resistance than zinc. In salt spray testing the coating will achieve in the range of 500 hours to red rust. Zinc-cobalt like zinc can be combined with chromates and sealers to increase corrosion resistance and improve the appearance. Current method of application at hohman plating is barrel plating.

Features & Advantages

Enhances corrosion resttance compared with zinc for the same thickness
Uniform ductility
Alternative procees for hazardus cadmium plating
Six times more corrosion resistance
Cobalt content in coating 0.2 – 0.8 % by weight
Over 400 hrs + nss

Availabel Process Type

Vat (or) rack process
Barrel process

Supplimentary Treatments Colored Conversion Treatment

Hexavalent black (cr 6+) & trivalent black (cr3+)
Hexavalent yellow (cr 6+) & trivalent yellow (cr 3+)
Hexavalent clear to blue (cr 6+) & trivalent clear to blue (cr 3+)
Hexavalent green

Industry Standards

ASTM B840
ASTM B633
ASTM B117