A kind of electroplating solution, electroplating process and coin of multi-layer cyanide-free electroplating copper-tin alloy coating

A technology for electroplating copper and tin alloys, applied in coins, clothing, jewelry, etc., can solve the problems of unevenness, cyanide-free electroplating of brass tin can not be plated with thick layers, etc., to reduce management costs, improve the plating environment, and improve production. horizontal effect
CN103668359BActive Publication Date: 2016-03-02SHANGHAI MINT +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI MINT
Publication Date
2016-03-02

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Abstract

The present invention relates to the technical field of coinage, and particularly to a plating solution and a plating process for a multi-layer cyanide-free plating copper-tin alloy coating, and coins made by the process. The pyrophosphate plating solution for a multilayer cyanide-free plating copper-tin alloy coating of the present invention comprises a cyanide-free main brightener based on tin-brass consisting of brighteners A and B, and the concentration of the brightener A in the main brightener is 1-10 g / L; the concentration of the brightener B in the main brightener is 0.05-0.5 g / L. With this pyrophosphate plating solution and the plating process for a multi-layer cyanide-free plating copper-tin alloy coating, the thickness of the coating of more than 20 mum can be achieved, and coin products with a dense and uniform coating can be obtained. A coating on a coin formed after high-temperature heat treatment has a single-layer structure, the content of tin in the single-layer coating by weight is 11% to 14%; the appearance of the coating is even and golden without chromatic aberration. Therefore, the well-recognized difficult problem in the plating industry that a single-layer cyanide-free plating alloy coating is thin is solved.
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Description

technical field

[0001] The invention relates to the technical field of coinage, in particular to an electroplating solution for a multilayer cyanide-free electroplating copper-tin alloy coating, an electroplating process and a coin product obtained by using the process. Background technique

[0002] The history of cyanide-containing electroplating can be traced back to 1831, and the practical electroplating process started with the patent of cyanide silver plating obtained by Elkington in 1840. Cyanide galvanizing has been used in practical applications during the First World War, and subsequently, cyanide plating technology was widely used in zinc, copper, cadmium, silver, gold and other single metal or alloy plating. However, cyanide is a highly toxic substance, and its lethal dose is only 5mg. Therefore, very high requirements are put forward for the management of highly toxic cyanide and the wastewater discharge treatment of cyanide-containing electroplating solutions. ...

Claims

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