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Cyaniding silver immersion method adopted before copper ornament silvering

A technology of immersion silver and copper decoration, applied in hot dip plating process, metal material coating process, coating and other directions, can solve the problems of cracking, peeling, affecting the surface quality of copper decoration silver plating, etc., to reduce production costs and improve The effect of bonding

Inactive Publication Date: 2015-11-18
LIUZHOU XUPING JEWELRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a cyanide immersion silver method for copper ornaments before silver plating, so as to solve the problem that the pre-silvering treatment of existing copper ornaments is easy to cause cracking and peeling, which affects the surface quality of copper ornaments after silver plating The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A cyanide immersion silver method for copper decorations before silver plating, the copper decorations after acid degreasing, chemical polishing and activation are put into stainless steel baskets for standby;

[0016] Include the following steps:

[0017] A, carry out silver immersion to copper ornaments with silver immersion solution, time is 5 seconds; The silver immersion solution comprises the following components by weight: 3 parts of silver nitrate, 75 parts of potassium cyanide, 75 parts of potassium carbonate;

[0018] B. Rinse the silver-impregnated copper ornaments in step A with water and dry them.

Embodiment 2

[0020] A cyanide immersion silver method for copper decorations before silver plating, the copper decorations after acid degreasing, chemical polishing and activation are put into stainless steel baskets for standby;

[0021] Include the following steps:

[0022] A, carry out silver immersion to copper ornament with silver immersion solution, time is 15 seconds; The silver immersion solution comprises the following components by weight: 5 parts of silver nitrate, 85 parts of potassium cyanide, 85 parts of potassium carbonate;

[0023] B. Rinse the silver-impregnated copper ornaments in step A with water and dry them.

Embodiment 3

[0025] A cyanide immersion silver method for copper decorations before silver plating, the copper decorations after acid degreasing, chemical polishing and activation are put into stainless steel baskets for standby;

[0026] Include the following steps:

[0027] A. Use silver immersion solution to immerse copper ornaments in silver for 5 seconds; the silver immersion solution is made of silver plating recovery solution containing 3 parts of silver nitrate, 75 parts of potassium cyanide and 75 parts of potassium carbonate through impurity removal treatment. The impurity removal process includes the following steps:

[0028] a. Mix hydrogen peroxide and silver-plating recovery solution at a weight ratio of 3:100, and stir evenly to obtain a mixed solution;

[0029] b. Heat the mixture to 55°C and keep it warm for 60 minutes;

[0030] c. Mix according to the weight ratio of activated carbon and silver-plating recovery solution of 4:100, let it stand for 3 hours, and filter to ...

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PUM

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Abstract

The invention discloses a cyaniding silver immersion method adopted before copper ornament silvering and relates to the technical field of electroplating. A copper ornament treated through acidic degreasing, chemical brightening and activating is placed in a basket for use. The cyaniding silver immersion method comprises the following steps that A, the copper ornament is immersed in silver immersion liquid for 5-15 seconds, wherein the silver immersion liquid comprises, by weight, 3-5 parts of silver nitrate, 75-85 parts of editpotassium cyanide and 75-85 parts of potassium carbonate; B, the copper ornament which is immersed in the silver immersion liquid in the step A is washed with water and aired. Compared with the prior art, the cyaniding silver immersion method adopted before copper ornament silvering can solve the problems that cracking and peeling phenomena are prone to happening due to existing pre-silvering treatment conducted on a copper ornament, and then the quality of the surface of the silvered copper ornament is influenced.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a pretreatment method for silver plating of copper ornaments. Background technique [0002] Copper ornaments should be electroplated into the required color according to the needs during production. Silver plating on the surface of copper ornaments can not only increase the color of the ornaments, but also increase the weldability of copper ornaments; copper ornaments should be electroplated before silver plating Pre-silvering treatment to improve the bonding force between the copper substrate and the plating layer. At present, the pretreatment of copper ornaments before silver plating has always been the traditional method of mercury immersion in copper ornaments. This traditional method of mercury immersion pretreatment of copper ornaments has the following problems in production: 1. Mercury and mercury compounds will pollute the environment and cause harm to the human ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/34C23C2/04
Inventor 李冬梅
Owner LIUZHOU XUPING JEWELRY
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