Tin stripping agent based on sulfuric acid-ferric salt system and preparing method of tin stripping agent

A technology of tin stripper and iron salt, which is applied in the field of tin stripper based on sulfuric acid-iron salt system and its preparation, can solve the problems of harmful gas, sludge and sewage, difficult sewage treatment, etc., and achieve no sludge, copper, etc. The effect of bright surface and fast stripping speed

Active Publication Date: 2016-06-29
GUANGDONG LEAR ELECTROCHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tin stripping water uses strong oxidizing substances such as nitric acid, which has the disadvantages of easily producing harmful gases, sludge and difficult sewage treatment.
Whether it is nitric acid-iron nitrate system or nitric acid-alkyl sulfonic acid system, there are disadvantages such as generation of harmful gas, corrosion of copper layer, generation of sludge, and difficult treatment of sewage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare a tin stripper based on sulfuric acid-iron salt system, the contents of each component are as follows: concentrated sulfuric acid 150g / L, ferric sulfate 100g / L, ferrous sulfate 0.5g / L, benzotriazole 1g / L, formazan Sulfonic acid 5g / L, polyethylene glycol (6000) 2g / L, hydrogen peroxide 10g / L, and the balance is water.

[0022] The preparation method of the tin stripping agent based on the sulfuric acid-iron salt system is as follows: dissolve ferric sulfate and ferrous sulfate in water, then add concentrated sulfuric acid, stir until completely dissolved, add benzotriazole, Alkylsulfonic acid, polyethylene glycol (6000), and hydrogen peroxide were stirred until they were completely dissolved, and the volume was adjusted to 1 liter with water to obtain the tin stripper based on the sulfuric acid-iron salt system. Select a 5 cm × 5 cm copper-clad pure tin plate with an average tin plating thickness of 10 microns, control the temperature of the above tin stripper at ...

Embodiment 2

[0024] Prepare a tin stripper based on sulfuric acid-iron salt system, the contents of each component are as follows: concentrated sulfuric acid 200g / L, ferric sulfate 200g / L, ferrous sulfate 0.5g / L, benzotriazole 1g / L, amino Sulfonic acid 5g / L, nonylphenol polyoxyethylene ether 2g / L, hydrogen peroxide 20g / L, and the balance is water.

[0025] The preparation method of the tin stripping agent based on the sulfuric acid-iron salt system is as follows: dissolve ferric sulfate and ferrous sulfate in water, then add concentrated sulfuric acid, stir until completely dissolved, add benzotriazole, Sulfamic acid, nonylphenol polyoxyethylene ether, and hydrogen peroxide were stirred until they were completely dissolved, and the volume was adjusted to 1 liter with water to obtain the tin stripper. Select a 5 cm × 5 cm copper-clad pure tin plate with an average tin plating thickness of 10 microns, control the temperature of the above tin stripper at 30 ° C, put the pure tin plate into 20...

Embodiment 3

[0027] Prepare a tin stripper based on sulfuric acid-iron salt system, the contents of each component are as follows: concentrated sulfuric acid 300g / L, ferric sulfate 200g / L, ferrous sulfate 0.5g / L, phenylacryltriazole 1g / L, alkanes Sulfonic acid 5g / L, polyethylene glycol (6000) 2g / L, hydrogen peroxide 10g / L, and the balance is water.

[0028] The preparation method of the tin stripping agent based on the sulfuric acid-iron salt system is as follows: dissolve ferric sulfate and ferrous sulfate in water, then add concentrated sulfuric acid, stir until completely dissolved, add benzotriazole, Methanesulfonic acid, polyethylene glycol (6000), and hydrogen peroxide were stirred until they were completely dissolved, and the volume was adjusted to 1 liter with water to obtain the tin stripper. Select a 5 cm × 5 cm copper-clad pure tin plate with an average tin plating thickness of 10 microns, control the temperature of the above tin stripper at 30 ° C, put the pure tin plate into 2...

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PUM

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Abstract

The invention discloses a tin stripping agent based on a sulfuric acid-ferric salt system and a preparing method of the tin stripping agent, and belongs to the technical field of metal coating stripping. The tin stripping agent based on the sulfuric acid-ferric salt system is prepared by following components including, by content, 150-300 g/L of concentrated sulfuric acid, 100-200 g/L of the ferric salt, 0.1-1 g/L of ferrous sulfate, 0.1-5 g/L of a copper organic corrosion inhibitor, 2-10 g/L of an organic acid complexing agent, 2-3 g/L of a surface active agent, 10-100 g/L of an accelerant and the balance water. The water serves as a solvent of the tin stripping agent based on the sulfuric acid-ferric salt system, nitric acid and fluoride are not contained, toxic gas containing oxynitride is not generated in the tin stripping process, sludge is not generated, the corrosion to copper is extremely low, the copper face is bright, and the tin stripping agent is an environment-friendly tin stripping agent.

Description

technical field [0001] The invention belongs to the technical field of stripping metal coatings, and in particular relates to a tin stripping agent based on a sulfuric acid-iron salt system and a preparation method thereof. Background technique [0002] PCB (short for Printed Circuit Board, Chinese name is printed circuit board, also known as printed circuit board) is an important electronic component, a support for electronic components, and a carrier for electrical connections of electronic components. In the process of circuit board printing, it is necessary to thicken the copper on the circuit pattern, and then tin-plate it, and use it as an etching resist layer to protect the circuit pattern during etching. The electroplated tin layer is removed, leaving the desired copper plating. [0003] Early tin strippers were mainly acidic aqueous solutions of hydrogen peroxide and fluoride. At present, domestic PCB companies mainly use nitric acid-ferric nitrate system and nitri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/44
CPCC23F1/44
Inventor 张波潘湛昌詹国和付正皋肖俊刘根胡光辉肖楚民
Owner GUANGDONG LEAR ELECTROCHEM LTD
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