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US 9,540,735 B2Granted
Zincating aluminum
AssigneeRoyal Canadian Mint
InventorsTaixiang Jiang, Xianyao Li, Hieu Cong Truong
Life of this patent
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Abstract
A method of treating aluminum or aluminum alloy includes providing an aluminum or aluminum alloy substrate; depositing a first zincating layer on the substrate by zincate immersion; stripping off the first zincating layer; depositing a second zincating layer on the substrate by zincate immersion; stripping off the second zincating layer; and depositing a third zincating layer on the substrate by zincate immersion.
Claims9
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.
6 more elements
Dependencies are inferred from the claim text.