Application method of alkali electroless nickel/cobalt-plating solution

An electroless plating, electroless nickel plating technology, applied in liquid electroless plating, metal material coating process, coating and other directions, can solve the problems of waste of resources, high cost of waste water, environmental hazards, etc., to slow down the failure time, reduce Production cost, the effect of simple means of realization

Inactive Publication Date: 2010-09-15
CHANGSHA LYRUN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in actual production, after a certain period of use of nickel or cobalt-plated alkaline plating solution, the plating speed slows down and the coating quality deteriorates. In order to ensure product quality, the plating solution cannot be used normally. The old solution can only be discarded to replace the new solution, which not only wastes precious resources, but also costs a lot of money for the treatment of wastewater, and because the wastewater of the electroless plating solution contains a high complexing agent, the wastewater cannot be completely treated, and the discarded heavy metals Lost to nature, causing great harm to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Prepare the following electroless nickel plating starting solution according to the existing method:

[0013] Nickel sulfate 25g / L Sodium hypophosphite 26g / L Sodium citrate 45g / L

[0014] The pH value is 8-9, and ammonia water is used as the pH regulator.

[0015] Keep the working temperature of the chemical plating solution at 45°C, and the roughened-sensitized-activated sponge enters the working tank of the chemical plating solution for electroless plating of nickel. During work, monitor the pH value of the solution at any time, as long as it is lower than 8, then Add the prepared sodium hydroxide solution with a concentration of 300g / l, and add ammonia water if necessary, until the pH value of the electroless plating solution is between 8 and 9. Monitor NH in solution 4 + The concentration should be no higher than 15g / L.

Embodiment 2

[0020] Prepare following electroless cobalt plating initial solution by existing method:

[0021] Cobalt sulfate 30g / L Sodium hypophosphite 30g / L Sodium citrate 50g / L

[0022] The pH value is 8-9, and ammonia water is used as the pH regulator.

[0023] Keep the working temperature of the chemical plating solution at 50°C, and the roughened-sensitized-activated sponge enters the working tank of the chemical plating solution for electroless plating of cobalt. During work, monitor the pH value of the solution at any time, as long as it is lower than 8, then Add the prepared mixed solution of sodium hydroxide and potassium hydroxide, OH - The concentration is 7.5mol / l, until the pH value of the electroless plating solution is between 8 and 9, add ammonia water if necessary, and monitor the NH in the solution at the same time 4 + The concentration should be no higher than 40g / L.

[0024] Experiments have shown that by adopting the above method, the chemical plating solution can...

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PUM

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Abstract

The invention provides an application method of an alkali electroless nickel/cobalt-plating solution. By using sodium hydroxide and/or potassium hydroxide as one additive for holding the pH value of an electroless plating solution, concentration of NH4<+> in the solution is not greater than 40g/L. The method can greatly slow down failure time of the alkali electroless plating solution, improve the metal utilization ratio in the electroless plating solution, lower the production cost and reduce the sewage treatment quantity; further, the method can be carried out simply and the production can be implemented practically and easily.

Description

technical field [0001] The invention relates to a method for using a solution for plating a metal film layer, in particular to a method for using an alkaline electroless plating solution for plating nickel or cobalt. Background technique [0002] At present, in actual production, after a certain period of use of nickel or cobalt-plated alkaline plating solution, the plating speed will slow down and the quality of the coating will deteriorate. In order to ensure product quality, the plating solution cannot be used normally. The old solution can only be discarded to replace the new solution, which not only wastes precious resources, but also costs a lot of money for the treatment of wastewater, and because the wastewater of the electroless plating solution contains a high complexing agent, the wastewater cannot be completely treated, and the discarded heavy metals Lost to nature, causing great harm to the environment. Contents of the invention [0003] The invention aims to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32
Inventor 吴庆锋周永段志明钟键明余欢喜
Owner CHANGSHA LYRUN NEW MATERIAL CO LTD
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