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High-efficiency tin-stripping water

A high-efficiency tin stripping technology, applied in the field of circuit board processing technology, can solve the problems of tin stripping copper bite, tin stripping water cannot be recycled and reused, and achieve the effect of eliminating threats

Inactive Publication Date: 2019-01-08
SHENZHEN ZHONGNAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Judging from the current manufacturers using alkaline etching solutions, the common problem is that they cannot solve the "copper biting" phenomenon in the process of stripping tin, and the stripping water after use cannot be recycled and reused.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The weight ratio of each component of the tin stripping water is: the weight ratio of nitric acid is 30%, the weight ratio of urea is 10%, the configuration ratio of anhydrous ferric chloride is 10%, and the weight ratio of ferric nitrate nonahydrate is 25%. %, ammonium carbonate 25%;

[0010] To the solution was added 0.1 mg of methanol and 0.1 mg of boric acid.

Embodiment 2

[0012] The weight ratio of each component of the tin stripping water is: the weight ratio of nitric acid is 88%, the weight ratio of urea is 1%, the configuration ratio of anhydrous ferric chloride is 1%, and the weight ratio of ferric nitrate nonahydrate is 5%. %, ammonium carbonate 5%;

[0013] 25 mg of methanol and 25 mg of boric acid were added to the solution.

[0014] The tin stripping water obtained in the above examples is a yellow-brown (brown) acidic liquid, its density (20°C): 1.20±0.20g / L, acid equivalent (H+): 5.0±0.5mol / L. It also has the following technical features:

[0015] 1. The tin stripping reaction is relatively stable, and the amount of acid mist generated is significantly lower than that of other similar products, which improves the working environment.

[0016] 2. The peeling speed is fast. When the stock solution is at 30°C, it only takes 30 seconds to peel off a 30μm thick tin-lead layer.

[0017] 3. The stock solution has little corrosion on the ...

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Abstract

The invention discloses high-efficiency tin-stripping water. The high-efficiency tin-stripping water is obtained mainly by mixing nitric acid, urea, anhydrous ferric chloride, ferric nitrate nonahydrate and ammonium carbonate, and further comprises an additive A and an additive B. The high-efficiency tin-stripping water has the beneficial effects as follows: copper corrosion on a circuit board isless, the product quality is improved, the waste liquid recycling rate after treatment is high, and environment friendliness is achieved.

Description

technical field [0001] The invention relates to the field of circuit board processing technology, in particular to a tin stripping water in an etching process in a printed circuit board (PCB) manufacturing process. Background technique [0002] Judging from the current manufacturers using alkaline etching solutions, the common problem is that they cannot solve the "copper biting" phenomenon in the process of stripping tin, and the stripping solution after use cannot be recycled and reused. Contents of the invention [0003] In view of the above technical problems, the present invention provides a "copper-free and high-efficiency tin stripping water", which can be recycled and recycled after adding our special additives in the recycling process. [0004] The "no copper bite" tin stripping solution of the present invention is mainly composed of nitric acid, urea, anhydrous ferric chloride, ferric nitrate nonahydrate, and ammonium carbonate, and there are two additives of dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/30
CPCC23F1/30
Inventor 戴泽民杨国雄苑伟东
Owner SHENZHEN ZHONGNAN ENVIRONMENTAL PROTECTION TECH CO LTD
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