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Removal liquor for nickel-phosphor coating, preparation method and removal method for nickel-phosphor coating

A technology of stripping and coating, applied in the field of circuit board processing, can solve the problems of difficult sewage treatment, life injury of operators, and great impact on environmental pollution, and achieve the effect of less environmental pollution

Inactive Publication Date: 2020-12-22
SHENZHEN CYPRESS IND DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because cyanide is a highly toxic substance, improper operation can easily cause harm to the lives of employees. The sewage generated by using cyanide and anti-pollution salt is difficult to treat, and has a great impact on environmental pollution.

Method used

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  • Removal liquor for nickel-phosphor coating, preparation method and removal method for nickel-phosphor coating
  • Removal liquor for nickel-phosphor coating, preparation method and removal method for nickel-phosphor coating
  • Removal liquor for nickel-phosphor coating, preparation method and removal method for nickel-phosphor coating

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Experimental program
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Effect test

preparation example Construction

[0043] The preparation method of above-mentioned stripping solution is as follows:

[0044] S1. Weigh nitric acid, sulfuric acid, peroxide, stabilizer and corrosion inhibitor according to the ratio of each component.

[0045] S2. Dissolving the peroxide in pure water to obtain a solution.

[0046] S3. Add sulfuric acid, nitric acid, stabilizer, and corrosion inhibitor to the above solution in a predetermined order, and add the next component after the previous component is completely dissolved.

[0047] Specifically, the order of sulfuric acid, nitric acid, stabilizer and corrosion inhibitor is not limited, as long as one of them is added each time and the next one is added after the dissolution is complete.

[0048] S4. Supplement pure water to a preset volume to meet the concentration of each component, stir until transparent, and obtain a stripping solution.

[0049] By adopting the above-mentioned preparation method, it is avoided that the temperature is too high during ...

Embodiment 1

[0056] Taking the preparation of 1L of stripping solution as an example, the components and contents are as follows:

[0057]

[0058] The preparation method of the stripping liquid of the present embodiment may further comprise the steps:

[0059] Sulfuric acid, nitric acid, diethylenetriaminepentaacetic acid, ethylenediamine, benzotriazole and hydrogen peroxide were weighed according to the above contents.

[0060] Dissolve hydrogen peroxide in purified water. At this time, the amount of purified water is less than 1L, about 200mL-700mL.

[0061] Add sulfuric acid, nitric acid, stabilizer, and corrosion inhibitor to the above solution in a predetermined order, and add the next component after the previous component is completely dissolved.

[0062] Specifically, sulfuric acid, nitric acid, diethylenetriaminepentaacetic acid and ethylenediamine are added sequentially.

[0063] Supplement pure water to 1L, stir until transparent, and obtain eliminator.

Embodiment 2

[0065] Taking the preparation of 1L of stripping solution as an example, the components and contents are as follows:

[0066]

[0067] The preparation method of the stripping liquid of the present embodiment may further comprise the steps:

[0068] Sulfuric acid, nitric acid, ethylenediaminetetraacetic acid, tolyltriazole and sodium persulfate were weighed according to the above contents.

[0069] Dissolve sodium persulfate in purified water. At this time, the amount of purified water is less than 1L, about 200mL-700mL.

[0070] Add sulfuric acid, nitric acid, stabilizer, and corrosion inhibitor to the above solution in a predetermined order, and add the next component after the previous component is completely dissolved.

[0071] Specifically, nitric acid, sulfuric acid, ethylenediaminetetraacetic acid, and tolyltriazole are sequentially added.

[0072] Supplement pure water to 1L, stir until transparent, and obtain eliminator.

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Abstract

The invention provides removal liquor for a nickel-phosphor coating, a preparation method and a removal method for the nickel-phosphor coating. The removal liquor for the nickel-phosphor coating comprises the following components: 50-200 g / L of sulfuric acid, 50-150 g / L of nitric acid, 10-100 g / L of peroxide, 0.5-15 g / L of a stabilizer and 5-25 g / L of a corrosion inhibitor, wherein the stabilizeris a metal ion complexing agent containing amino group and carboxylic acid. The multiple components of the removal liquor cooperate to accomplish removal of the nickel-phosphor coating; sulfuric acidand nitric acid co-provide an acidic environment, and nitric acid and peroxide co-oxidize the nickel-phosphor coating, so that dropped components of medium-phosphor nickel and high-phosphor nickel aredissolved in an accelerated mode to quicken surface corrosion, and therefore, the surface of the coating is oxidized to have seams, and the coating is cracked, dissolved and dropped to increase a strip-off rate. Through action of the stabilizer and the corrosion inhibitor, harm on a copper alloy is reduced. The components of the removal liquor provided in the invention do not include cyanide harmful on a human body, and also does not include fluorine ions which attack the equipment, so that pollution on environment is small.

Description

technical field [0001] The invention relates to the technical field of circuit board processing, in particular to a stripping solution for a nickel-phosphorus coating, a preparation method and a stripping method for the nickel-phosphorus layer. Background technique [0002] Copper alloy layer phosphorus nickel plating process is widely used in the electronic and electrical industry. Plating medium phosphorus nickel or high phosphorus nickel on copper alloy can greatly enhance the product's resistance to the attack of precision instrument workpieces in harsh corrosive environments. However, any product may have problems such as unqualified coating quality and missing plating in the electroplating process, and it needs to be reprocessed after the coating is removed. [0003] At present, the nickel-phosphorus coating on the copper alloy layer is often stripped by concentrated nitric acid or alkaline chemical methods. However, due to the strong acidity and strong corrosiveness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/30
CPCC23F1/30
Inventor 莫庆生饶猛
Owner SHENZHEN CYPRESS IND DEV CO LTD