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Electrosilvering solution and electrosilvering method

A technology of electroplating silver and solution, which is applied in the field of electroplating to achieve the effect of reducing pollution, excellent dispersion ability and good leveling ability

Inactive Publication Date: 2012-09-26
东莞市闻誉实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these processes have their own characteristics, none of them can completely replace cyanide silver plating.

Method used

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  • Electrosilvering solution and electrosilvering method
  • Electrosilvering solution and electrosilvering method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of electroplating silver solution, comprises by weight parts:

[0046]

[0047]

[0048] Polish the metal substrate successively with coarse sandpaper and fine sandpaper; soak the polished substrate in 11% KOH solution for 10 minutes; remove the oxide film on the surface of the substrate in the washing solution after washing with water; wash with water Finally, pre-dip silver on the surface of the substrate; after washing, connect the substrate to the wire, put it in the electroplating solution, and then plate it with silver; after plating, wash it with water, and put it in a chemical passivation solution for anti-tarnish treatment; finally in the air Let dry naturally. The formula of the pre-silvering solution includes 16g / L silver nitrate and 202g / L thiourea, and the pH value is 3. The washing solution is preferably prepared from concentrated nitric acid, concentrated sulfuric acid and water in a volume ratio of 1:1:1. The silver plating temperature is ...

Embodiment 2

[0050] A kind of electroplating silver solution, comprises by weight parts:

[0051]

[0052] Polish the metal substrate successively with coarse sandpaper and fine sandpaper; soak the polished substrate in a KOH solution with a mass fraction of 15%, take it out after 20 minutes; remove the oxide film on the surface of the substrate in the washing solution after washing with water; wash with water Finally, pre-dip silver on the surface of the substrate; after washing, connect the substrate to the wire, put it in the electroplating solution, and then plate it with silver; after plating, wash it with water, and put it in a chemical passivation solution for anti-tarnish treatment; finally in the air Let dry naturally. The formula of the pre-silvering solution includes 19g / L silver nitrate and 218g / L thiourea, and the pH value is 4. The washing solution is preferably prepared from concentrated nitric acid, concentrated sulfuric acid and water in a volume ratio of 1:1:1. The s...

Embodiment 3

[0054] A kind of electroplating silver solution, comprises by weight parts:

[0055]

[0056] Polish the metal substrate successively with coarse sandpaper and fine sandpaper; soak the polished substrate in a KOH solution with a mass fraction of 25%, take it out after 12 minutes; remove the oxide film on the surface of the substrate in the washing solution after washing with water; wash with water Finally, pre-dip silver on the surface of the substrate; after washing, connect the substrate to the wire, put it in the electroplating solution, and then plate it with silver; after plating, wash it with water, and put it in a chemical passivation solution for anti-tarnish treatment; finally in the air Let dry naturally. The formula of the pre-silvering solution includes 17g / L silver nitrate and 208g / L thiourea, and the pH value is 3.8. The washing solution is preferably prepared from concentrated nitric acid, concentrated sulfuric acid and water in a volume ratio of 1:1:1. The...

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PUM

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Abstract

The invention relates to an electrosilvering solution and an electrosilvering method. The electrosilvering solution comprises silver salt, methionine, sodium carbonate, sodium pyrophosphate, niobium chloride and methanesulfonic acid, wherein the silver salt is silver nitrate. The electrosilvering method comprises the following steps of (1) polishing, (2) deoiling, (3) primary washing, (4) pre-electrosilvering, (5) secondary washing, (6) electrosilvering and (7) antitarnishing. The electrosilvering solution used in the electrosilvering is the electrosilvering solution disclosed by the invention. With the electrosilvering solution and the electrosilvering method provided by the invention, a dense silver coating with good bonding force can be obtained.

Description

technical field [0001] The invention relates to electroplating technology, in particular to an electroplating silver solution and an electroplating method. Background technique [0002] Silver is a silvery-white, malleable, plastic and reflective precious metal. Electroplated silver is widely used in electrical appliances, electronics, communication equipment and instrument manufacturing industries. Silver plating is used to prevent corrosion, increase conductivity, reflectivity and aesthetics. Widely used in manufacturing industries such as electrical appliances, instruments, meters and lighting appliances. For example, when copper or copper alloy parts are silver-plated, they must first be degreased and rust-free; A layer of mercury film; then the workpiece is used as the cathode, and the pure silver plate is used as the anode, which is immersed in the silver potassium cyanide electrolyte composed of silver nitrate and potassium cyanide for electroplating. Cyanide-free ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46
Inventor 叶伟炳
Owner 东莞市闻誉实业有限公司
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