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Cyanide-free silver plating solution and electroplating method

A technology of electroplating silver and solution, which is applied in the field of cyanide-free electroplating silver solution and electroplating, and achieves the effects of reasonable formula, good solution stability and good quality

Inactive Publication Date: 2015-07-01
南京宁美新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Cyanide-free silver plating solution and electroplating method
  • Cyanide-free silver plating solution and electroplating method

Examples

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Embodiment 1

[0025] A kind of cyanide-free electroplating silver solution of the present embodiment 1, be 40g / L silver nitrate, 20g / L disodium edetate, 120g / L succinimide, 20g / L nitric acid, 80g by comprising mass concentration / L potassium hydroxide, 0.06g / L sodium lauroyl sarcosinate and 0.8g / L nicotinamide.

[0026] Adopt the electroplating method of the cyanide-free electroplating silver solution of embodiment 1, as follows:

[0027] Step 1, prepare the cyanide-free electroplating silver solution according to the proportioning mentioned above, and adjust the pH value of the cyanide-free electroplating silver solution to 10.2;

[0028] Step 2. Use the silver plate as the anode and the copper piece (pre-plated piece) as the cathode, control the temperature of the cyanide-free silver plating solution at 25°C to 35°C, use a DC power supply, and control the current density to 1A / dm 2 ; Perform electroplating for 1-5min to obtain an electroplated silver layer on the surface of the copper pi...

Embodiment 2

[0034] A kind of cyanide-free electroplating silver solution of the present embodiment 2, be 50g / L silver nitrate, 40g / L disodium edetate, 160g / L succinimide, 30g / L nitric acid, 100g by comprising mass concentration / L potassium hydroxide, 0.1g / L sodium lauroyl sarcosinate and 10g / L nicotinamide.

[0035] Adopt the electroplating method of the cyanide-free electroplating silver solution of embodiment 2, as follows:

[0036] Step 1, prepare the cyanide-free electroplating silver solution according to the proportioning mentioned above, and adjust the pH value of the cyanide-free electroplating silver solution to 10.2;

[0037] Step 2. Use the silver plate as the anode and the pre-plated parts (such as copper parts) as the cathode, control the temperature of the cyanide-free electroplating silver solution at 25°C to 35°C, use a DC power supply, and control the current density to 1A / dm 2 ; Perform electroplating for 1-5min to obtain an electroplated silver layer on the surface of...

Embodiment 3

[0041] A kind of cyanide-free electroplating silver solution of the present embodiment 3, be 30g / L silver nitrate, 20g / L edetate disodium, 100g / L succinimide, 10g / L nitric acid, 50g by comprising mass concentration / L potassium hydroxide, 0.01g / L sodium lauroyl sarcosinate and 0.1g / L nicotinamide.

[0042] Adopt the electroplating method of the cyanide-free electroplating silver solution of embodiment 3, as follows:

[0043] Step 1, prepare the cyanide-free electroplating silver solution according to the proportioning mentioned above, and adjust the pH value of the cyanide-free electroplating silver solution to 10.2;

[0044] Step 2. Use the silver plate as the anode and the copper piece as the cathode, control the temperature of the cyanide-free electroplating silver solution at 25°C to 35°C, use a DC power supply, and control the current density to 1A / dm 2 ; Perform electroplating for 1-5min to obtain an electroplated silver layer on the surface of the copper piece.

[004...

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Abstract

The invention provides a cyanide-free silver plating solution and an electroplating method. The cyanide-free silver plating solution comprises silver nitrate, ethylenediamine tetraacetic acid disodium salt, succinimide, nitric acid, potassium hydroxide, sodium lauroyl sarcosine and nicotinamide. The electroplating method comprises the following steps of adjusting a pH value of the cyanide-free silver plating solution to be 10-11; controlling the temperature of the cyanide-free silver plating solution to be 20 DEG C-40 DEG C; adopting a silver plate as an anode and a preplating piece as a cathode, and controlling the electric current density to be 0.2-2A / dm<2>; finishing electrosilvering. The cyanide-free silver plating solution provided by the invention does not contain cyanide and has no toxicity to environment and a human body. The formula is reasonable, and the stability of the solution is good. The silvering layer obtained by adopting the cyanide-free silver plating solution to electroplate on the surface of the preplating piece is good in quality, favorable in adhesion strength and white and attractive in appearance.

Description

technical field [0001] The invention relates to the technical field of electroplating silver, in particular to a cyanide-free electroplating silver solution and an electroplating method. Background technique [0002] The electroplating silver process began in 1840. The main component of the plating solution is cyanide. The plating solution is stable, has good plating ability and depth capability, and the plating layer is crystallized and fine, which can meet the requirements of various purposes. It is still widely used today. . [0003] However, cyanide is a highly toxic substance, which poses a great threat to the environment no matter it is produced, stored, transported or used. As early as 2003, my country had requested to stop the cyanide electroplating process. The National Development and Reform Commission announced the guidance catalog for industrial structure adjustment, and had listed "cyanide-containing electroplating" as the 182nd item of "elimination category". ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46C25D5/00
Inventor 许荣国
Owner 南京宁美新材料科技有限公司
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