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A kind of method of vacuum cyanide-free electroplating to prepare high sulfur resistance pure silver coating

A cyanide-free silver-plating and vacuum silver-plating technology is applied in the field of electroplating, which can solve the problems of decreased electrical conductivity of the electrical contact material of the silver-plated layer, poor electrical conductivity of silver sulfide, and heating failure of the isolating switch, and achieves good wear resistance, Good electrical conductivity and good sulfur resistance

Active Publication Date: 2019-08-13
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrical contact material of the silver-plated layer is easy to corrode mainly because silver is easily oxidized in the atmosphere to form silver oxide, and silver oxide is easy to react with sulfide in the atmosphere to form silver sulfide in a humid environment. The conductive performance of the silver layer electrical contact material is reduced
Outdoor high-voltage isolating switches are mostly directly exposed to the atmosphere in practical applications, especially in coastal industrial high-humidity, high-salt, and high-sulfur environments. Fever failure

Method used

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  • A kind of method of vacuum cyanide-free electroplating to prepare high sulfur resistance pure silver coating
  • A kind of method of vacuum cyanide-free electroplating to prepare high sulfur resistance pure silver coating
  • A kind of method of vacuum cyanide-free electroplating to prepare high sulfur resistance pure silver coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Configuration of cyanide-free silver plating solution

[0025] Main components of silver plating solution: AgNO 3 20 g / L, KI 300 g / L, K 2 CO 3 10 g / L, K 2 C 2 o 4 10 g / L, pH 10.

[0026] (2) Preparation of vacuum pure silver coating

[0027] Copper substrate surface treatment: firstly use 800-mesh sandpaper to polish the copper substrate to remove surface burrs, difficult to accommodate, corrosion marks and scale, and then use 1000-mesh sandpaper to polish the copper substrate to make the surface of the copper substrate smooth and flat. The polished copper substrate was rinsed with deionized water, immersed in 50 g / L NaOH solution for 3 min, then taken out, then soaked in deionized water at room temperature for 5 s, immersed in 10wt% nitric acid solution for 30 s, and then taken out , and finally soaked in deionized water at room temperature for 10 s.

[0028] Vacuum silver plating: the copper substrate after surface treatment is charged and put into the pla...

Embodiment 2

[0031] (1) Configuration of cyanide-free silver plating solution

[0032] Main components of silver plating solution: AgNO 3 30 g / L, KI 350 g / L, K 2 CO 3 15 g / L, K 2 C 2 o 4 15 g / L, pH 11.

[0033] (2) Preparation of vacuum pure silver coating

[0034] Copper surface treatment: firstly use 800-mesh sandpaper to polish the copper substrate to remove surface burrs, difficult to accommodate, corrosion marks and scale, and then use 1000-mesh sandpaper to polish the copper substrate to make the surface of the copper substrate smooth and flat. The polished copper substrate was rinsed with deionized water, immersed in 70 g / L NaOH solution for 5 min, then taken out, then soaked in deionized water at room temperature for 15 s, immersed in 20 wt% nitric acid solution for 1 min, and then taken out , and then soaked in room temperature deionized water for 20 s.

[0035] Vacuum silver plating: the copper substrate after surface treatment is charged and placed in the plating tank fo...

Embodiment 3

[0038] (1) Configuration of cyanide-free silver plating solution

[0039] Main components of silver plating solution: AgNO 3 40 g / L, KI 400 g / L, K 2 CO 3 20g / L, K 2 C 2 o 4 20g / L, pH 12.

[0040] (2) Preparation of vacuum pure silver coating

[0041] Copper surface treatment: firstly use 800-mesh sandpaper to polish the copper substrate to remove surface burrs, difficult to accommodate, corrosion marks and scale, and then use 1000-mesh sandpaper to polish the copper substrate to make the surface of the copper substrate smooth and flat. The polished copper substrate was rinsed with deionized water, immersed in 90 g / L NaOH solution for 7 min, then taken out, then soaked in deionized water at room temperature for 20 s, immersed in 30 wt% nitric acid solution for 2 min, and then taken out , and then soaked in room temperature deionized water for 30 s.

[0042]Vacuum silver plating layer: The copper substrate after surface treatment is charged and put into the plating tan...

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Abstract

The invention discloses a method for preparing a highly sulfur-resistant pure silver coating by vacuum cyanide-free electroplating, which specifically comprises the steps of configuring a cyanide-free silver plating solution, surface treatment of a copper substrate, and a vacuum silver plating layer. The pure silver coating prepared by the present invention has excellent anti-sulfur performance, and at 5%Na 2 Immersed in S solution for 12 hours without discoloration, the anti-sulfur performance meets the requirements of the navigation mark QJ485‑1988; it has good binding force and meets the requirements of the national standard GB / T 5270‑2005. In addition, the prepared pure silver coating has the characteristics of excellent electrical conductivity, thermal conductivity, wear resistance and long mechanical life. The pure silver coating of the invention has good comprehensive performance, and has high application value for outdoor high-voltage isolating switches used in atmospheric environments, especially in coastal industrial high-humidity, high-salt, and high-sulfur environments.

Description

technical field [0001] The invention relates to a method for preparing a highly sulfur-resistant pure silver coating by vacuum cyanide-free electroplating, and specifically relates to the technical field of electroplating. Background technique [0002] At present, the contact protection parts of outdoor high-voltage isolating switches are mostly made of silver-plated electrical contact materials. This electrical contact material has good electrical and thermal conductivity and low and stable contact resistance, but there is a problem of easy corrosion. The electrical contact material of the silver-plated layer is easy to corrode mainly because silver is easily oxidized in the atmosphere to form silver oxide, and silver oxide is easy to react with sulfide in the atmosphere to form silver sulfide in a humid environment. The electrical conductivity of the silver layer electrical contact material decreases. Outdoor high-voltage isolating switches are mostly directly exposed to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/46C25D5/00
CPCC25D3/46C25D5/00
Inventor 叶志国涂景罗马光郝文魁陈保安韩钰
Owner NANCHANG HANGKONG UNIVERSITY