FIELD: manufacturing technology.
SUBSTANCE: invention relates to coin workpiece processing containing aluminium or aluminium alloy. Applying zinc coating first layer onto coin workpiece using immersion zinc plating in coatings application drum. Removing zinc coating first layer. Applying zinc coating second layer onto coin workpiece using immersion zinc plating in coatings application drum. Removing zinc coating second layer. Applying zinc coating third layer onto coin workpiece using immersion zinc plating in coatings application drum. Coating coin workpiece with one or more metal or metal alloys layers in absence of cyanide. Performing annealing to create metal diffusion between coin workpiece and one or more coating layers, in order to facilitate adhesion.
EFFECT: result is durable and safe coins with multilayer coating.
24 cl, 21 dwg, 6 tbl
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