Chemical deplating solution and deplating method suitable for removing tin-nickel coating on surface of brass

A technology of tin-nickel coating and stripping solution, applied in stripping solution and stripping field, can solve the problems of water, soil, natural ecological pollution, affecting the physical and mental health of workers, harsh working environment, etc. It is beneficial to the large-scale production operation of the factory, and the effect of the substrate color is basically unchanged.

Inactive Publication Date: 2012-05-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Often contain cyanide, chromic acid, hydrofluoric acid, etc. in these processes about brass substrate elemental coating, these deplating solutions often contain very high toxicity, cause working environment bad, have a strong impact on the physical and mental health of workers, and also affect the water area , soil, and natural ecology produce a lot of pollution
And, the method for copper substrate deplating coating that has been reported at present also generally exists overcorrosion strong, high cost, defects such as difficult suitability for industrialized production, so it is necessary to develop a kind of novel deplating of tin-nickel alloy coating on brass surface Liquid and its deplating method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The chemical deplating solution of the present invention is used for the deplating method of removing the tin-nickel coating on the surface of brass, and the steps are as follows:

[0026] 1. Surface treatment: Immerse the waste material with tin-nickel coating on the brass substrate in 80℃ lye for 3min;

[0027] The lye is an aqueous solution, which contains: NaOH: 8g / L, Na 2 CO 3 :50g / L, Na 3 PO 4 ·12H 2 O: 56g / L, NaSiO 3 : 10g / L;

[0028] 2. Water washing: Wash and dry the waste materials after finishing alkali washing, and set aside;

[0029] 3. Deplating: immerse the dried waste material into 250mL compound acid / L (1L contains 36-38% hydrochloric acid 65mL, 65-68% nitric acid 195mL), 30g citric acid / L, 0.10g benzotriazide Deplating is carried out in a deplating bath with azole / L and the balance is water; the deplating condition is at a temperature of 50℃; stirring is continued during the deplating process, and the deplating time is 6 minutes;

[0030] 4. Take out the waste,...

Embodiment 2

[0032] The chemical deplating solution of the present invention is used for the deplating method of removing the tin-nickel coating on the surface of brass, and the steps are as follows:

[0033] 1. Surface treatment: Immerse the waste material plated with tin-nickel coating on the brass substrate in 90℃ lye for 2min;

[0034] The lye is an aqueous solution, which contains: NaOH: 10g / L, Na 2 CO 3 :55g / L, Na 3 PO 4 ·12H 2 O: 60g / L, NaSiO 3 : 5g / L;

[0035] 2. Water washing: Wash and dry the waste after finishing alkali washing, and set aside;

[0036] 3. Deplating: Immerse the dried tin-nickel coating waste into 300mL compound acid / L (1L contains 36~38% hydrochloric acid 75mL, 65-68% nitric acid 225mL), 20g citric acid / L, 0.30g benzene Deplating is carried out in a deplating solution with triazole / L and the balance is water; the deplating condition is 40°C; constant stirring during the deplating process, the deplating time is 6 minutes;

[0037] 4. Take out the waste, rinse with deioniz...

Embodiment 3

[0039] The chemical deplating solution of the present invention is used for the deplating method of removing the tin-nickel coating on the surface of brass, and the steps are as follows:

[0040] 1. Surface treatment: Immerse the waste material plated with tin-nickel coating on the brass substrate in 90℃ lye for 2min;

[0041] The lye is an aqueous solution, which contains: NaOH: 12g / L, Na 2 CO 3 :60g / L, Na 3 PO 4 ·12H 2 O: 56g / L, NaSiO 3 : 5g / L;

[0042] 2. Water washing: Wash and dry the waste after finishing alkali washing, and set aside;

[0043] 3. Deplating: Immerse the dried tin-nickel coating waste into 400mL composite acid / L (including hydrochloric acid 100mL / L, nitric acid 300mL / L), 15g citric acid / L, 0.40g benzotriazole / L, Deplating is carried out in a deplating bath with the balance of water; the deplating condition is 30°C; stirring continuously during the deplating process, and the deplating time is 10 minutes;

[0044] 4. Take out the waste, rinse with deionized water, r...

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PUM

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Abstract

The invention discloses a deplating solution and a deplating method thereof for tin-nickel coating (commonly called plated scrap) on the surface of brass. The deplating solution comprises oxidizer, accelerator, complexing agent and inhibitor, and the deplating solution is prepared by adding water to the reagents, stirring, dissolving, then putting in a water bath and slowly heating. The oxidizer adopts 65-68% nitric acid, the accelerator adopts 36-38% hydrochloric acid, the complexing agent adopts citric acid and the inhibitor adopts benzotriazole. After being deplated by the deplating solution of the invention, the surface of the brass is bright, the color of the substrate is basically unchanged, and the brass has no pinholes and small corrosion amount.

Description

Technical field [0001] The invention relates to a deplating solution and a deplating method thereof, in particular to a chemical deplating solution and a deplating method suitable for removing a tin-nickel coating on the surface of brass. Background technique [0002] The recycling and utilization of scraps of copper and copper alloy products with tin-nickel coatings on the surface have received great attention in countries all over the world. In order to recycle the inferior or waste products with metallization on the surface, the metal composite coating needs to be removed, that is, stripping. Regarding the plating deplating process, a chemical or electrochemical removal method can be used. The electrochemical method of removing liquid has simple components, weak corrosion to the substrate, and recyclability of some metals, which is beneficial to environmental protection. However, it needs to provide power supply and deplating tank, and sometimes requires special hangers. This...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/16C23F1/30
Inventor 胡献国蔡文举徐玉福
Owner HEFEI UNIV OF TECH
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