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Electroplating liquid of multi-layer cyanide-free electroplated copper-tin alloy coating, electroplating technology and coin thereof

A technology for electroplating copper and tin alloys, applied in coins, clothing, jewelry, etc., can solve the problems of cyanide-free electroplating of brass tin, such as inability to plate thick plating and unevenness, and improve the plating environment, reduce management costs, and reduce The effect of environmental influence pressure

Active Publication Date: 2014-03-26
SHANGHAI MINT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the disadvantages that the cyanide-free electroplating of brass tin cannot be plated thick and the coating is uneven in the prior art, the object of the present invention is to provide a pyrophosphate electroplating solution and a multilayer cyanide-free electroplating copper-tin alloy coating. The electroplating process of one-layer cyanide-free electroplating copper-tin alloy coating and the coin products produced by this electroplating process, the electroplating process of this pyrophosphate electroplating solution and multi-layer cyanide-free electroplating copper-tin alloy coating can obtain a coating thickness of more than 20 μm Coin products with uniform and dense coating

Method used

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  • Electroplating liquid of multi-layer cyanide-free electroplated copper-tin alloy coating, electroplating technology and coin thereof
  • Electroplating liquid of multi-layer cyanide-free electroplated copper-tin alloy coating, electroplating technology and coin thereof
  • Electroplating liquid of multi-layer cyanide-free electroplated copper-tin alloy coating, electroplating technology and coin thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The low-carbon steel coinage blank is used as the substrate, the first layer and the second layer are electroplated sequentially on it, and then it is used as a product. The specific steps are as follows:

[0085] (1) Alkaline degreasing

[0086] Put the coinage blank into the alkaline degreasing liquid, the degreasing liquid is 50g / L degreasing agent, the temperature is 55°C for 20 minutes, and then rinse with 60°C deionized water;

[0087] (2) Electrodegreasing

[0088] Put the above-mentioned coinage blanks after alkali washing in the electrolytic degreasing liquid, the degreasing liquid is 60g / L degreasing agent, the temperature is 55°C, and the current density is 0.5A / dm 2 , carry out anodic electrolytic cleaning for 20 minutes, and then rinse with deionized water at 60°C;

[0089] (3) Hydrochloric acid activation

[0090] Place the coinage blank after electrolytic degreasing in the HCL solution with a concentration of 350mL / L at a temperature of 20°C for 7 minu...

Embodiment 2

[0102] The low-carbon steel coinage blank is used as the substrate, the first layer and the second layer are electroplated sequentially on it, and then it is used as a product. The specific steps are as follows:

[0103] (1) Alkaline degreasing

[0104] Put the coinage blank into the alkaline degreasing liquid, the degreasing liquid is 60g / L degreasing agent, the temperature is 60°C for 20 minutes, and then rinse with 60°C deionized water;

[0105] (2) Electrodegreasing

[0106] Put the above-mentioned coinage blanks after alkali washing in the electrolytic degreasing liquid, the degreasing liquid is 70g / L degreasing agent, the temperature is 60°C, and the current density is 1.0A / dm 2 , carry out anodic electrolytic cleaning for 20 minutes, and then rinse with deionized water at 60°C;

[0107] (3) Hydrochloric acid activation

[0108] Place the coinage blank after electrolytic degreasing in the HCL solution with a concentration of 480mL / L at a temperature of 25°C for 7 minu...

Embodiment 3

[0120] The low-carbon steel coinage blank is used as the substrate, the first layer and the second layer are electroplated sequentially on it, and then it is used as a product. The specific steps are as follows:

[0121] (1) Alkaline degreasing

[0122] Put the mint blank into the alkaline degreasing liquid, the degreasing liquid is 70g / L degreasing agent, the temperature is 65°C for 20 minutes, and then rinse with 60°C deionized water;

[0123] (2) Electrodegreasing

[0124] Put the above-mentioned mint blanks after alkali washing in the electrolytic degreasing liquid, the degreasing liquid is 80g / L degreasing agent, the temperature is 65°C, and the current density is 1.2A / dm 2 , carry out anodic electrolytic cleaning for 20 minutes, and then rinse with deionized water at 60°C;

[0125] (3) Hydrochloric acid activation

[0126] Put the coinage blank after electrolytic degreasing in the HCL solution with a concentration of 480mL / L at a temperature of 29°C for 7 minutes of a...

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Abstract

The invention relates to the technical field of coinage, and particularly relates to electroplating liquid of a multi-layer cyanide-free electroplated copper-tin alloy coating, an electroplating technology and a coin produced by the technology. The pyrophosphate electroplating solution of a multi-layer cyanide-free electroplated copper-tin alloy coating provided by the invention comprises a cyanide-free brass tin major brightening agent consisting of solutes brightener A and brightener B, wherein the concentration of the brightener A in the major brightening agent is 1-10g / L, and the concentration of the brightener B in the major brightening agent is 0.05-0.5g / L. By adopting the pyrophosphate electroplating solution and the electroplating technology of the multi-layer cyanide-free electroplated copper-tin alloy coating, a coin product of which the coating thickness is over 20 microns and the coating is uniform and dense can be obtained. After high-temperature thermal treatment, the coil coating is of a single-layer structure; the content of tin in the single-layer coating is 11-14% by weight; the coating appearance is in uniform golden yellow color without chromatic aberration, and the problem acknowledged by the electroplating section at present that a single-layer cyanide-free electroplated alloy coating is relatively thin is solved.

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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Application Information

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IPC IPC(8): C25D3/56C25D3/58C25D3/60C25D5/10C25D7/00A44C21/00
CPCC25D3/58C25D5/50C25D7/005
Inventor 张勃徐伟王卓新徐岷宋金华张高军陆懿王斌曹雅哲
Owner SHANGHAI MINT
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