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Environmentally-friendly chemical deplating agent for nickel plating and deplating method

A nickel coating and stripping technology, applied in the field of chemical stripping and stripping, can solve the problems of high toxicity of sodium m-nitrobenzene sulfonate, large stripping waste water, excessive corrosion of metal substrates, etc. The effect of promoting stripping rate and preventing over-corrosion

Active Publication Date: 2017-12-01
佛山市南博旺环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for electroless nickel plating on ordinary carbon steel parts, but sodium m-nitrobenzene sulfonate is highly toxic and is not easy to use in large quantities
The acidic chemical nickel stripping solution generally uses concentrated nitric acid or sulfuric acid as the main oxidant, but concentrated nitric acid produces a large amount of nitrogen oxide gas during the stripping process. Potential safety hazards; the oxidant content used in the acidic chemical nickel stripping solution is high, the corrosion rate is fast, and it is easy to cause over-corrosion of the metal substrate
At the same time, after the existing chemical deplating solution is used, a large amount of deplating wastewater is generated, which requires additional processes for treatment and recovery, which is difficult to process and high in recycling costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The environmental protection chemical stripping agent that is used for nickel coating of the present embodiment is made up of the component of following concentration: sulfuric acid 35g / L, oxalic acid 40g / L, sodium citrate 15g / L, sodium acetate 30g / L, sodium gluconate 20g / L, the balance is water.

[0029] The stripping method adopting above-mentioned environment-friendly chemical stripping agent of the present embodiment comprises the following steps:

[0030] 1) The nickel coating is activated by sulfuric acid with a mass concentration of 30%, and the activation time is 20s;

[0031] 2) immerse the activated coating in the environment-friendly chemical stripping agent, and immerse it under 30KHz ultrasonic conditions until the nickel coating is stripped;

[0032] 3) Wash with water.

Embodiment 2

[0034] The environmental protection chemical stripping agent that is used for nickel coating of the present embodiment is made up of the component of following concentration: sulfuric acid 45g / L, oxalic acid 50g / L, sodium citrate 20g / L, sodium acetate 20g / L, sodium gluconate 30g / L, the balance is water.

[0035] The stripping method adopting above-mentioned environment-friendly chemical stripping agent of the present embodiment comprises the following steps:

[0036] 1) The nickel coating is activated by sulfuric acid with a mass concentration of 40%, and the activation time is 15s;

[0037] 2) Dip the activated coating into the environment-friendly chemical stripping agent, and immerse it under 30KHz ultrasonic conditions until the nickel coating is stripped clean

[0038] 3) Wash with water.

Embodiment 3

[0040] The environmental protection chemical stripping agent that is used for nickel coating of the present embodiment is made up of the component of following concentration: sulfuric acid 60g / L, oxalic acid 60g / L, sodium citrate 30g / L, sodium acetate 40g / L, sodium gluconate 45g / L, the balance is water.

[0041] The stripping method adopting above-mentioned environment-friendly chemical stripping agent of the present embodiment comprises the following steps:

[0042] 1) The nickel coating is activated by sulfuric acid with a mass concentration of 50%, and the activation time is 10s;

[0043] 2) immerse the activated coating in the environment-friendly chemical stripping agent, and immerse it under 30KHz ultrasonic conditions until the nickel coating is stripped;

[0044] 3) Wash with water.

[0045] The composition of the environment-friendly chemical stripping agent that is used for nickel plating layer of embodiment 4-9 is as shown in table 1; Stripping method is the same...

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PUM

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Abstract

The invention relates to an environmentally-friendly chemical deplating agent for a nickel plating and a deplating method. The deplating agent comprises the components of 30 g / L to 100 g / L of sulfuric acid, 30 g / L to 140 g / L of oxalic acid, 10 g / L to 30 g / L of sodium citrate, 10 g / L to 60 g / L of sodium acetate, 15 g / L to 60 g / L of sodium gluconate, and the balance being water. According to the environmentally-friendly chemical deplating agent, oxalic acid is added based on sulfuric acid, acidity of oxalic acid is not high, and overetching of the nickel plating can be prevented; oxalic acid can provide hydrogen ions used for corroding the plating, and the deplating purpose of the nickel plating can be achieved through only a relatively small amount of sulfuric acid; deplating speed is high, efficiency is high, a deplated stainless steel matrix is smooth in surface, overetching is avoided, and follow-up reutilization and processing are not affected; and oxalate and nickel ions generate nickel oxalate sediment through complexing, nickel is directly sedimented and separated from the system, the follow-up step of recycling nickel metal from deplating waste water is eliminated, nickel oxalate can be directly recycled, and utilization is convenient.

Description

technical field [0001] The invention belongs to the technical field of chemical stripping, and in particular relates to an environment-friendly chemical stripping agent for nickel plating, and also relates to a stripping method using the environment-friendly chemical stripping agent. Background technique [0002] Deplating refers to the process of removing the coating on the surface of the workpiece, which is an inevitable part in the field of electroplating. There are generally two methods of deplating: one is chemical deplating, the deplating parts are soaked in the deplating solution, the principle is to remove the coating by chemical dissolution; the other is electrolytic deplating, the deplating parts are It is placed in the deplating solution for electrolysis, and the principle is to remove the coating by electrochemical method. [0003] Electroless plating Because in the process of workpiece plating, the coating on the surface of the workpiece is completely realized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/44C23F1/28
CPCC23F1/28C23F1/44
Inventor 田长春
Owner 佛山市南博旺环保科技有限公司
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