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Environment-friendly copper-tin alloy coating deplating liquid and method deplating method

A copper-tin alloy and deplating solution technology, applied in the field of electroplating, can solve problems such as corrosion of equipment and workshops, serious environmental pollution, over-corrosion of the substrate, etc., and achieve the effects of low cost, improved working environment, and stable reaction

Inactive Publication Date: 2017-02-08
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional deplating process, the deplating solution containing high concentration of sulfuric acid and nitric acid is usually used. The above deplating solution contains a strong oxidant and has strong acidity, so it is very easy to have an adverse effect on the substrate itself during deplating.
In addition, concentrated nitric acid reacts with copper, which is both a strong oxidant and an acid, and produces a large amount of harmful gas, commonly known as "Huanglong", which seriously pollutes the environment, does great harm to the human body, and also produces great harm to equipment and workshops. corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Stripping solution of the present invention is used to strip the method for stripping copper-tin alloy coating, and step is:

[0020] 1. Surface treatment: immerse the plated parts in lye at 60°C for 3 minutes;

[0021] The lye is an aqueous solution, which contains: sodium carbonate: 28g / L, sodium phosphate: 28g / L, sodium dodecylbenzenesulfonate: 5g / L;

[0022] 2. Washing with water: wash and dry the waste after finishing alkali washing, and set aside;

[0023] 3. Deplating: Dip the dried plated parts into 150g sodium p-nitrobenzoate / L, 10g ammonium acetate / L, 10mL propanol / L, 100mL glycerol / L, 6mL ethylenediamine / L, 1g Ammonium thiocyanate / L, the balance is deplating in the deplating solution of water; Deplating condition is room temperature; Stirring is needed in the deplating process, and the deplating time is 5 minutes;

[0024] 4. Take out the waste, rinse with deionized water, rinse and dry.

Embodiment 2

[0026] Stripping solution of the present invention is used to strip the method for stripping copper-tin alloy coating, and step is:

[0027] 1. Surface treatment: immerse the plated parts in lye at 65°C for 2 minutes;

[0028] The lye is an aqueous solution, which contains: sodium carbonate: 30g / L, sodium phosphate: 30g / L, sodium dodecylbenzenesulfonate: 6g / L;

[0029] 2. Washing with water: wash and dry the waste after finishing alkali washing, and set aside;

[0030] 3. Deplating: Dip the dried plated parts into 200g sodium p-nitrobenzoate / L, 20g ammonium acetate / L, 20mL propanol / L, 125mL glycerol / L, 7mL ethylenediamine / L, 2g Ammonium thiocyanate / L, the balance is deplating in the deplating solution of water; Deplating condition is room temperature; Stirring is needed in the deplating process, and the deplating time is 4 minutes;

[0031] 4. Take out the waste, rinse with deionized water, rinse and dry.

Embodiment 3

[0033] Stripping solution of the present invention is used to strip the method for stripping copper-tin alloy coating, and step is:

[0034] 1. Surface treatment: immerse the plated parts in lye at 70°C for 2 minutes;

[0035] The lye is an aqueous solution, which contains: sodium carbonate: 35g / L, sodium phosphate: 35g / L, sodium dodecylbenzenesulfonate: 8g / L;

[0036] 2. Washing with water: wash and dry the waste after finishing alkali washing, and set aside;

[0037] 3. Deplating: Dip the dried plated parts into 250g sodium p-nitrobenzoate / L, 30g ammonium acetate / L, 30mL propanol / L, 150mL glycerol / L, 8mL ethylenediamine / L, 3g Ammonium thiocyanate / L, and the balance is deplating in the deplating solution of water; Deplating condition is room temperature; Stirring is needed during the deplating process, and the deplating time is 3 minutes;

[0038] 4. Take out the waste, rinse with deionized water, rinse and dry.

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PUM

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Abstract

The invention relates to an environment-friendly copper-tin alloy coating deplating liquid and a deplating method thereof. Per liter of deplating liquid comprises the following components by mass concentration: 150-250g / L sodium p nitrobenzoate, 10-30g / L ammonium acetate, 10-30ml / L propyl alcohol, 100-150ml / L glycerol, 6-10ml / L ethylene diamine and 1-3 g / L ammonium thiocyanate. The color of a matrix after deplating of the deplating liquid is fundamentally unchanged; the deplating liquid is stable; a coating is deplated completely and efficiently; a technology is simple; the surface of the matrix of a plating piece is not corroded; no harmful gas is generated; the service cycle is long; the cost can be saved; and the deplating liquid and the deplating method conform to the aims of environmental protection and conservation required in the society.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an environment-friendly copper-tin alloy coating deplating solution and a deplating method thereof. Background technique [0002] Unqualified coatings will be produced during the electroplating process, and coatings will also be deposited on the racks supporting the plated parts; the former needs to be recycled, and the latter needs to be used repeatedly, so the coating needs to be completely removed. The stripping solution is usually suitable for the stripping of the copper-tin alloy layer on the surface of the substrate. In the traditional deplating process, the deplating solution containing high concentration of sulfuric acid and nitric acid is usually used. The above deplating solution contains a strong oxidant and has strong acidity, so it is very easy to have an adverse effect on the substrate itself during deplating. . In addition, concentrated nitric acid reacts ...

Claims

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Application Information

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IPC IPC(8): C23F1/44
CPCC23F1/44
Inventor 杨富国杨飞张玉红
Owner FOSHAN UNIVERSITY
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