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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

Active Publication Date: 2016-03-02
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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  • A kind of electroplating solution, electroplating process and coin of multi-layer cyanide-free electroplating copper-tin alloy coating
  • A kind of electroplating solution, electroplating process and coin of multi-layer cyanide-free electroplating copper-tin alloy coating
  • A kind of electroplating solution, electroplating process and coin of multi-layer cyanide-free electroplating copper-tin alloy coating

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 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.

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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Patent Type & Authority Patents(China)
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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