Silver plating process

A process and pre-plating silver technology, which is applied in the field of metal surface treatment, can solve the problems of poor bonding force of the coating, no coating in deep concave parts, etc., and achieve the effect of solving poor bonding force

Inactive Publication Date: 2014-08-13
XIAN XIGUANG SURFACE FINISHING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the above technical problems and provide a silver plating process to overcome the shortcomings of the existing silver plating technology, such as poor bonding force of the coating and no coating in the deep concave part.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Prepare 100L silver plating solution: 38g / L silver chloride AgCl, 95g / L analytically pure potassium cyanide KCN, 1.3g / L analytically pure sodium thiosulfate Na 2 S 2 o 3 .5H 2 The content of O is prepared.

[0032] Among them, silver chloride is made by adding sodium chloride to silver nitrate, specifically: 5.7 kg of silver nitrate and 2 kg of sodium chloride are dissolved in a separate container with an appropriate amount of water, and then the The sodium chloride solution is slowly poured into the silver nitrate solution, and at the same time, it is kept stirring. At this time, a white curd-like silver chloride precipitate is precipitated. After standing, the upper solution is poured out by decantation, and the remaining The silver chloride at the bottom is washed 2 to 3 times with distilled water to remove Na+ , NO 3 - and more Cl - Ion, standby, the whole operation process should be carried out in a dark room or place away from light.

[0033] Then 9.5 kg...

Embodiment 2

[0043] 1. Prepare 100L silver plating solution: 30g / L silver chloride AgCl, 70g / L analytically pure potassium cyanide KCN, 0.5g / L analytically pure sodium thiosulfate Na 2 S 2 o 3 .5H 2 O content is prepared.

[0044] Wherein, silver chloride is obtained by adding sodium chloride to silver nitrate, specifically: 5.7 kg of silver nitrate and 2 kg of sodium chloride are dissolved in a separate container with an appropriate amount of water, and then the The sodium chloride solution is slowly poured into the silver nitrate solution, and at the same time, it is kept stirring. At this time, a white curd-like silver chloride precipitate is precipitated. After standing, the upper solution is poured out by decantation, and the remaining The silver chloride at the bottom is washed 2 to 3 times with distilled water to remove Na + , NO 3 - and more Cl - Ion, standby, the whole operation process should be carried out in a dark room or place away from light.

[0045] Then 7 kg of po...

Embodiment 3

[0055] 1. Prepare 100L silver plating solution: 45g / L silver chloride AgCl, 120g / L analytically pure potassium cyanide KCN, 2g / L analytically pure sodium thiosulfate Na 2 S 2 o 3 .5H 2 O content is prepared.

[0056] Wherein, silver chloride is obtained by adding sodium chloride to silver nitrate, specifically: 5.7 kg of silver nitrate and 2 kg of sodium chloride are dissolved in a separate container with an appropriate amount of water, and then the The sodium chloride solution is slowly poured into the silver nitrate solution, and at the same time, it is kept stirring. At this time, a white curd-like silver chloride precipitate is precipitated. After standing, the upper solution is poured out by decantation, and the remaining The silver chloride at the bottom is washed 2 to 3 times with distilled water to remove Na + , NO 3 - and more Cl - Ion, standby, the whole operation process should be carried out in a dark room or place away from light.

[0057] Then 12 kg of po...

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PUM

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Abstract

The invention relates to a plating process which comprises the following steps: (1) removing oil by using an organic solvent; (2) removing the oil by using ultrasonic waves; (3) washing by using water; (4) corrosively washing; (5) washing by using the water; (6) pickling; (7) washing by using the water; (8) activating; (9) washing by using the water; (10) immersing zinc; (11) washing by using the water; (12) chemically plating nickel; (13) washing by using the water; (14) pre-plating silver; (15) plating the silver, namely placing a metal part with the silver pre-plated into a plating solution at the temperature of 10-35 DEG C, and controlling the current density between 0.3 A/dm<2> and 0.4 A/dm<2>, wherein a silver plating solution comprises the following components by weight: 30-45 g/L of silver chloride AgCl, 70-120 g/L of potassium cyanide KCN and 0.5-2 g/L of sodium thiosulfate Na2S2O3.5H2O; (16) recovering; (17) washing by using the water; (18) immersing an anti-blushing agent; (19) drying. The plating process disclosed by the invention can be used for overcoming the defects of poor clad layer binding force and no clad layer on a deep recessed part of the traditional silver plating technology.

Description

technical field [0001] The invention relates to an electroplating process, in particular to a silver plating process for metal materials such as aluminum and aluminum alloy, and belongs to the technical field of metal surface treatment. Background technique [0002] Silver is a silver-white metal with an atomic weight of 108 and a density of 10.5. The electrochemical equivalent of silver is 4.025g / A.h, and the standard electrode potential of silver is 0.81V. The silver coating has good conductivity and solderability, and is easy to polish. High chemical stability. [0003] At present, the silver plating process is mainly used in electrical connectors, especially with the development of electronic technology in recent years, aluminum is widely used in the electronic field because of its cheap price, light weight, and easy processing. Therefore, aluminum Silver plating technology is particularly important. However, the main problems in the current domestic silver plating pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/46C25D5/44
Inventor 李麦翠王新军李晓菲刘利毕喜凤
Owner XIAN XIGUANG SURFACE FINISHING
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