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Thick gold electroplated copper based workpiece and manufacturing method

A technology of electroplating thick gold and a production method, which is applied in the field of electroplating processing, and can solve the problems of cyanide, chromium in the passivation solution, and poor bonding force of the coating, so as to achieve non-peeling, smooth surface, good surface wear resistance and corrosion resistance Effect

Active Publication Date: 2020-06-30
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a copper-based workpiece for electroplating thick gold and a manufacturing method thereof, aiming at solving the problem of cyanide being contained in the gold plating solution of the prior art, and the combination of each coating layer in the electroplating thick gold. Poor strength, and defects of chromium in the passivation solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for making thick gold electroplated on a copper-based watch case, said method comprising the following steps:

[0044] Step S1. Pretreatment: Electrolytic degreasing treatment is performed on the copper-based workpiece, and the electrolyte includes: NaOH3g / L, NaHCO 3 5g / L, electrolysis temperature is 40℃, current density is 3A / dm 2 , electrolytic degreasing for 1min, and then wash the copper-based workpiece with water;

[0045] Step S2. Electroplating the bottom nickel layer: place the copper-based workpiece after the pretreatment in the bottom nickel plating solution, and the bottom nickel plating solution includes: nickel chloride 150g / L, hydrochloric acid 80ml / L under the condition that the temperature is room temperature Conduct electroplating of the bottom nickel layer with a current density of 6A / dm 2 , the plating time is 1min;

[0046] Step S3. Electroplating the 18K gold layer: the copper-based workpiece after electroplating the bottom nickel layer...

Embodiment 2

[0053] A method for making thick gold electroplated on a copper-based watch case, said method comprising the following steps:

[0054] Step S1. Pretreatment: Electrolytic degreasing treatment is performed on the copper-based workpiece, and the electrolyte includes: NaOH4g / L, NaHCO 3 10g / L, electrolysis temperature is 45℃, current density is 4A / dm 2 , electrolytic degreasing for 1.5min, and then clean the copper-based case with water;

[0055] Step S2. Electroplating the bottom nickel layer: place the copper-based workpiece after the pretreatment in the bottom nickel plating solution, and the bottom nickel plating solution includes: nickel chloride 160g / L, hydrochloric acid 85ml / L under the condition that the temperature is room temperature The bottom nickel layer was electroplated with a current density of 7A / dm 2 , the plating time is 1.5min;

[0056] Step S3. Electroplating the 18K gold layer: the copper-based workpiece after electroplating the bottom nickel layer is pla...

Embodiment 3

[0063] A method for making thick gold electroplated on a copper-based watch case, said method comprising the following steps:

[0064] Step S1. Pretreatment: Electrolytic degreasing treatment is performed on the copper-based workpiece, and the electrolyte includes: NaOH 5g / L, NaHCO 315g / L, electrolysis temperature is 50℃, current density is 6A / dm 2 , electrolytic degreasing for 2 minutes, and then wash the copper-based case with water;

[0065] Step S2. Electroplating the bottom nickel layer: place the copper-based workpiece after the pretreatment in the bottom nickel plating solution, and the bottom nickel plating solution includes: nickel chloride 180g / L, hydrochloric acid 90ml / L under the condition that the temperature is room temperature Conduct electroplating of the bottom nickel layer with a current density of 8A / dm 2 , the plating time is 2min;

[0066] Step S3. Electroplating the 18K gold layer: the copper-based workpiece after electroplating the bottom nickel layer...

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Abstract

The invention discloses a thick gold electroplated copper based workpiece and a manufacturing method. The manufacturing method comprises the steps of pretreatment, bottom nickel layer electroplating,18K gold layer electroplating, 23K gold layer electroplating, stress removal, tinting, and antitarnish coating treatment. A surface shell of the thick gold electroplated copper based workpiece sequentially comprises a bottom nickel layer, a 18K gold plated layer, a 23K gold plated layer and an antitarnish coating from inside to outside. The manufacturing method comprises the steps that before thick gold electroplating, bottom nickel electroplating treatment is carried out, after thick gold electroplating, annealing treatment is carried out, antitarnish coating treatment is carried out on the surface of a thick gold plating, prepared electroplated thick gold is bonded with a copper base firmly, peeling is not easy, the service life of a gold cladding is prolonged, the cladding is uniform and compact, and attractive in color, and a good oxidation color changing prevention property is achieved.

Description

technical field [0001] The invention relates to the technical field of electroplating processing, in particular to a copper-based workpiece electroplated with thick gold and a manufacturing method thereof. Background technique [0002] Gold plating of metal parts is a common method of metal surface treatment. Gold plating can improve the wear resistance, corrosion resistance, electrical conductivity of metal parts, enhance the reflectivity of the surface of metal parts and improve the appearance. At present, people generally use the water wet gold plating method for electroplating treatment, but the gold salt usually used in water wet gold plating is mostly cyanide salt, which is mainly because the cyanide salt bath has good stability and the production process is easy to control, but in the process of electroplating It will produce highly toxic cyanide, and its passivation solution contains chromium, which is difficult to handle and is easy to cause harm to the environment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D3/12C25D3/62C25D5/34C25D5/48
CPCC25D3/12C25D3/62C25D5/12C25D5/34C25D5/48
Inventor 杨富国梁丽芬张玉红陈文莲赵绮婷章枚婷
Owner FOSHAN UNIVERSITY
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