Hardener

A technology of hardener and complexing agent, applied in the field of hardener, can solve the problem of low hardness and achieve the effect of improving hardness

Active Publication Date: 2014-09-17
SHENZHEN UNITED BLUEOCEAN TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of hardening agent that is beneficial to improve the hardness of gold products in order to overcome the defects of low hardness of existing gold products

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach

[0024] According to a specific embodiment of the present invention, the preparation method of the gold product comprises:

[0025] Electroplating a layer of gold on a mandrel formed of a low melting point material;

[0026] forming a hole through the electroplated layer to the mandrel, and melting the mandrel to exit through the hole; wherein the method of electroplating a gold layer on the mandrel comprises using the mandrel as a cathode, in Electroplating is performed in a cyanide-free plating solution and / or a cyanide-containing plating solution containing the above-mentioned hardener.

[0027] The mandrel mainly functions as a molding die, so that not only can various shapes of gold products be obtained, but also the gold products obtained after removing the mandrel have a hollow structure, so that the production of gold products of the same size can be significantly reduced. The amount of gold used in the finished product reduces the production cost. In the present inve...

Embodiment 1

[0039] This embodiment is used to illustrate the preparation method of hardener provided by the present invention and cyanide-free electroplating solution.

[0040] At 60°C, dissolve 200 grams of potassium phosphate, 100 grams of potassium monohydrogen phosphate, 50 grams of sodium sulfite, 0.5 grams of sodium antimony tartrate, 0.5 grams of sodium selenite and 5 grams of sodium edetate in 1 L of water to obtain hardened Agent Y1. At 60° C., 10 grams of sodium gold sulfite was uniformly mixed with hardener Y1 in terms of gold element to obtain cyanide-free electroplating solution Z1. The stability and conductivity of cyanide-free electroplating solution Z1 were determined by cyclic voltammetry, cathodic polarization curve and cathodic current efficiency method. The results show that the cyanide-free electroplating solution Z1 has high stability, only a very small amount of gold ions are automatically reduced, the conductivity is very good, and the cathode current efficiency i...

Embodiment 2

[0042] This embodiment is used to illustrate the preparation method of hardener provided by the present invention and cyanide-free electroplating solution.

[0043] Dissolve 180 g of sodium phosphate, 80 g of sodium monohydrogen phosphate, 40 g of potassium sulfite, 0.2 g of antimony potassium tartrate, 0.3 g of sodium selenosulfate and 2 g of thiourea in 1 L of water at 40°C to obtain hardener Y2 . At 60° C., 10 grams of gold potassium sulfite was uniformly mixed with the hardener Y2 to obtain the cyanide-free electroplating solution Z2. According to the method of Example 1, the stability and conductivity of the cyanide-free electroplating solution Z2 were tested. The results show that the cyanide-free electroplating solution Z2 has high stability, no automatic reduction of gold ions, better conductivity but lower than that of the cyanide-free electroplating solution Z1, and the cathodic current efficiency is maintained above 90%.

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Abstract

The invention provides a hardener which comprises phosphate, hydrophosphate, sulfite, antimonic salt and/or selenium salt and a complexing agent, wherein the sulfite is alkali metal sulfite. The hardener obtained by match of the substances for use in electroplating to prepare a gold product not only can remarkably improve the stability of the electroplate liquid so as to make the electroplating process be stably processed, but also further can improve the hardness of the gold product, so that the hardener has an extremely good industrial application prospect.

Description

technical field [0001] The present invention relates to a hardener. Background technique [0002] With the improvement of people's living standards, gold products are more and more favored by consumers. At present, more and more gold products are produced by electroplating. Wherein, the electroplating solution used in the electroplating process is mainly a solution containing potassium gold cyanide. However, potassium gold cyanide is a highly toxic substance, which will not only cause harm to the health of the manufacturer in the production process of gold products, but also need to spend a lot of money to deal with the production waste in order to reduce the pollution of the production waste liquid to the environment. liquid. [0003] In order to overcome the above-mentioned defects of the electroplating solution containing potassium gold cyanide, in recent years, some enterprises have adopted a solution containing gold sulfite solution (potassium gold sulfite and / or sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48
Inventor 庄龙三
Owner SHENZHEN UNITED BLUEOCEAN TECH DEV
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