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Electroplating solution for silver

A technology of electroplating solution and conductive salt, applied in the field of silver electroplating solution, can solve the problems of pre-silver plating or immersion silver, inconvenient operation and management, poor stability of the plating solution, etc., and achieves bright coating adhesion, good corrosion resistance, The effect of mild plating conditions

Inactive Publication Date: 2018-01-19
佛山市春暖花开科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The present invention provides a silver electroplating solution, which solves the problems of poor stability of the plating solution, uneven deposition, pre-plating or immersion silver, and avoids the problems of strict control of current density and inconvenient operation and management during electroplating

Method used

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  • Electroplating solution for silver
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  • Electroplating solution for silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Thin-walled copper tubes are electroplated in an electroplating tank. The electroplating solution in the electroplating tank includes solvent water, 20g / L silver nitrate, 40g / L potassium sulfate, 4g / L ethylenediamine, 0.2g / L thio Sodium sulfate, the boric acid of 12g / L, the complexing agent of 40g / L, wherein, described complexing agent is following structure,

[0018]

[0019] The pH value of the plating solution in the electroplating tank is 6.5, and the current density is 14A / dm 2 , the temperature was 47°C, and the electroplating time was 7 minutes.

[0020] After the electroplating is completed, the electroplated silver layer has good bright effect, high uniformity, and no pinholes, black spots, etc.; according to the ASTMB571 standard, heat the electroplated silver-plated copper tube to 240-260°C in the furnace, then take it out and put it in After cooling in water at room temperature, the silver coating does not bubble or fall off, indicating that the bonding ...

Embodiment 2

[0022] The rectangular iron sheet is electroplated in the electroplating tank. The electroplating solution in the electroplating tank includes solvent water, 40g / L silver chloride, 60g / L potassium chlorate, 5g / L tetraethylenepentamine, 0.3g / L thio The complexing agent of the citric acid of sodium sulfate, 13g / L, 80g / L, wherein, described complexing agent is following structure,

[0023]

[0024] The pH value of the plating solution in the electroplating tank is 7.5, and the current density is 7A / dm 2 , the temperature is 25°C, and the plating time is 12 minutes.

[0025] After the electroplating is completed, the electroplated silver layer has good brightness, high uniformity, and no pinholes, black spots, etc.; according to the ASTMB571 standard, heat the iron sheet of the electroplated silver coating to 240-260 ° C in the furnace, then take it out and put it in After cooling in water at room temperature, the silver coating does not bubble or fall off, indicating that the...

Embodiment 3

[0027] The iron block with several deep holes and blind holes is electroplated in the electroplating tank. The electroplating solution in the electroplating tank includes solvent water, 60g / L silver chloride, 80g / L ammonium sulfate, 5.5g / L ethylene glycol Aminotetraacetic acid, potassium thiocyanate of 0.4g / L, the tartaric acid of 15g / L, the complexing agent of 120g / L, wherein, the complexing agent is the following structure,

[0028]

[0029] The pH value of the plating solution in the electroplating tank is 7, and the current density is 2A / dm 2 , the temperature is 57°C, and the plating time is 5 minutes.

[0030] After the electroplating is completed, the electroplated silver layer has good bright effect, high uniformity, and no pinholes, black spots, etc.; according to the ASTMB571 standard, heat the iron block of the electroplated silver layer to 240-260°C in the furnace, then take it out and put it in After cooling in water at room temperature, the silver coating doe...

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Abstract

The invention discloses an electroplating solution for silver. The electroplating solution is prepared from solvent water, main salt with the concentration of 20-100 g / L, conducting salt with the concentration of 40-120 g / L, an additive with the concentration of 4-7 g / L, a brightening agent with the concentration of 0.2-0.7 g / L, a buffering agent with the concentration of 12-20 g / L and a complexing agent with the concentration of 40-200 g / L, wherein 2,5-diketopiperazine or a derivative thereof is adopted as the complexing agent. The electroplating solution for silver is simple in formula, extremely low in toxicity or nontoxic, good in stability, uniform in deposition and good in surface appearance and mirror surface brightening effect; the electroplating conditions are mild and easy to manage, operate and implement and are less affected by the current density; a silver film obtained through electroplating is good in corrosion resistance; a plating workpiece does not need to be subjected to silver preplating or silver immersion; and a plating layer is good in bonding force and bright, and the application requirements in multiple fields of decorative electroplating, functional electroplating and the like are met.

Description

technical field [0001] The invention relates to an electroplating solution, in particular to a silver electroplating solution. Background technique [0002] Silver has white luster, stable chemical properties, good thermal conductivity and electrical conductivity, is not easily corroded by chemicals, has high chemical stability to organic acids and alkalis, is soft in quality, rich in ductility, and is cheaper than other precious metals. Extremely high, up to more than 99%, widely used in decorations, tableware and electronic products and other fields. [0003] Electroplating silver is a relatively mature process in the electroplating industry. The cyanide silver plating process endangers the health of human beings and seriously pollutes the environment. With the strengthening of environmental protection awareness, cyanide-free silver plating has attracted more and more attention, but the stability of the electroplating solution for cyanide-free silver plating is poor, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46
Inventor 朱小燕
Owner 佛山市春暖花开科技有限公司
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