Preparation method for environment-friendly chemical deplating agent applied to copper plating and nickel plating

A nickel-plating, environmentally friendly technology, applied in the field of chemical stripping solution, can solve problems such as substrate corrosion and environmental pollution, and achieve the effect of fast stripping speed

Inactive Publication Date: 2018-03-13
繁昌县晶鑫贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention effectively solves the problem that the stripping agent used in the chemical stripping method in the prior art produces volatile stimulati

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The test material is a red copper plate of 10mm×10mm×2mm, which is put into sulfuric acid with a mass percentage of 98% sulfuric acid 400g / L, hydrogen peroxide with a mass percentage of 30% hydrogen peroxide 150g / L, and a thiourea content of 50g / L. Deplating solution, the reaction temperature is 80°C. The copper plate reacts quickly in the deplating solution and dissolves completely, and the reaction speed is 55 μm / min (thickness direction of the plate).

Embodiment 2

[0035] The test material is a nickel plate of 10mm × 10mm × 2mm, put it into the sulfuric acid with a mass percentage of 98% sulfuric acid 300g / L, hydrogen peroxide with a mass percentage of 30% hydrogen peroxide 120g / L, and a thiourea content of 30g / L. Deplating solution, the reaction temperature is 75°C. The nickel plate reacts quickly in the deplating solution and dissolves completely, and the reaction speed is 57 μm / min (thickness direction of the plate).

Embodiment 3

[0037] The test material is a copper-plated stainless steel piece of 20mm×12mm×0.32mm, the base stainless steel is 304L, the thickness of the copper plating layer is 0.02mm, put it into the sulfuric acid with a mass percentage of 98% sulfuric acid 250g / L, and the hydrogen peroxide mass percentage Be 30% hydrogen peroxide 100g / L, the deplating solution that urotropine content is 50g / L, and deplating temperature is 20 ℃. The copper plating layer reacts in the stripping solution, wherein the copper plating layer is stripped, the stripping is complete, and the carbon steel substrate does not appear to be seriously corroded. The deplating speed was 23 μm / min (thickness direction of the plating layer).

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PUM

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Abstract

The invention provides a preparation method for an environment-friendly chemical deplating agent applied to copper plating and nickel plating. The environment-friendly chemical deplating agent is an aqueous solution comprising sulfuric acid, hydrogen peroxide and corrosion inhibitor, wherein the corrosion inhibitor is organic matter containing nitrogen or sulfur and the like or a high-polarity organic compound containing -COOR, -COOH, -CHO, triple bonds (C is equivalent to C) or multiple hydroxyl -OH and the like. In addition, potential differences exist between a cathode and an anode, the potential differences can be eliminated or reduced through the action of an electron-poor group and an electron-rich group of the organic matter, and therefore corrosion can be reduced or corrosion can be temporarily stopped. The deplating liquid is high in deplating speed, at the appropriate temperature, a 0.2 mm-thick nickel coating and a 0.2 mm-thick copper coating can be deplated within 2 minutes, and the waste deplating liquid obtained after deplating is completed facilities recovering of metal copper and nickel.

Description

technical field [0001] The invention relates to a chemical stripping solution, in particular to a production method of an environment-friendly chemical stripping agent applied to copper plating and nickel plating. Background technique [0002] Copper-plated and nickel-plated workpieces are widely used in people's production and life. Copper and nickel plating on the metal surface has many advantages and good performance. In the traditional deplating solution, the main component is high-concentration nitric acid, which can easily cause serious corrosion to the substrate during deplating. In addition, due to the presence of strong oxidizing concentrated nitric acid, when stripping, nitric acid will react with metals, releasing a large amount of nitric oxide (NO) and nitrogen dioxide (NO2) yellow smoke, which will seriously pollute the atmosphere and harm human health. Serious bodily injury. [0003] 1. Potassium dichromate is contained in the oxidant, and chromium is a heavy...

Claims

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Application Information

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IPC IPC(8): C23F1/44
CPCC23F1/44
Inventor 钟劲跃
Owner 繁昌县晶鑫贸易有限公司
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