Patent ID: 9540735
Date: 2017-01-10
CPC Classifications: A44C,B32B,C23C,C25D,Y10T

Claim:
1. A method of treating a coin blank comprising an aluminum alloy, the method comprising: providing the coin blank comprising an aluminum alloy; depositing a first zincating layer on the coin blank by zincate immersion in a plating barrel; stripping off the first zincating layer; depositing a second zincating layer on the coin blank by zincate immersion in a plating barrel; stripping off the second zincating layer; depositing a third zincating layer on the coin blank by zincate immersion in a plating barrel; plating one or more layers of metal or metal alloys on the coin blank in the absence of cyanide; and annealing the plated coin blank at a temperature between 400 and 600° C. to create a metallic diffusion between the coin blank and the one or more plating layers to assist adhesion.