A kind of silver plating solution pre-dissolving process

A technology of pre-dissolving and silver-plating solution, applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems affecting the uniformity of silver plating, the concentration cannot be improved, and the rise of silver ions, etc., so as to save raw materials for silver plating, Uniform thickness and improved product quality

Active Publication Date: 2016-06-29
NINGBO KANGQIANG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When adding silver, due to the influence of the dissolution rate, the concentration cannot be increased at the beginning, and the silver ion will rise sharply after it is completely dissolved, which seriously affects the uniformity of the silver coating and is not conducive to the control of silver cost.

Method used

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  • A kind of silver plating solution pre-dissolving process

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Embodiment 1

[0043] 1. Dissolving (preparing a silver-containing solution with a silver ion concentration of 80g / L)

[0044] Silver cyanide and potassium cyanide are used as raw materials; the volume of the prepared solution is 700L.

[0045] A. Calculate the required dosage of each drug according to the preparation amount and preparation concentration.

[0046] According to the calculation, 70KG of silver cyanide and 35KG of potassium cyanide are needed.

[0047] B. Add about 500L of pure water into the dissolving tank, then add 35KG of potassium cyanide, circulate the liquid medicine and raise the temperature (set the temperature at 60°C). Circulate for two hours until the potassium cyanide is completely dissolved.

[0048] C. Add 70KG silver cyanide to the solution, add pure water to 700L, and circulate the solution for 24 hours until the silver cyanide is completely dissolved.

[0049] D. Laboratory personnel take samples and analyze, and adjust the silver ion concentration to the t...

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Abstract

The invention discloses a silvering solution pre-dissolving process. The process comprises the following steps: adding pure water into a dissolving tank, starting a heater arranged in the dissolving tank and a circulating pump arranged on the dissolving tank; then adding potassium cyanide into the dissolving tank; under the circulating stirring action of the circulating pump, adding silver cyanide after potassium cyanide is dissolved fully into water; injecting the dissolved liquid medicine into a storing tank through a liquid outlet pipeline, a valve and an extracting pump which are arranged on the dissolving tank; after the liquid medicine is injected into the storing tank, starting the heater and a liquid medicine circulating pump which are arranged in the storing tank; introducing the liquid medicine in the storing tank into a titrating tank, and then starting the circulating pump and the heater which are arranged in the titrating tank, then starting a titration metering pump so as to add the liquid medicine into a plating bath with an appointed flow rate due to the adoption of the titration metering pump. Due to the adoption of the process, the thickness of a silver layer on the surface of a silvered product can be uniform without salient points, and furthermore, a large amount of silvering raw materials can be saved.

Description

technical field [0001] The invention relates to an electroplating liquid treatment process, which belongs to the technical field of electroplating, and in particular to a silver plating liquid predissolving process. Background technique [0002] The existing silver plating process 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 silver plating is also used in industries such as electrical appliances and instruments. The electroplating solution uses thiosulfate, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D21/14
Inventor 郑康良裘佩明陈亚军谢艳周曦孙宜藤
Owner NINGBO KANGQIANG ELECTRONICS CO LTD
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