Nickel stripping solution and preparation method and application thereof

Abstract

The invention relates to the technical field of chemical nickel stripping, and discloses a nickel stripping liquid and its preparation method and application. The nickel stripping liquid has the advantages of clean and fast nickel stripping, no corrosion of substrates, and no harm to the environment and human body. The invention discloses a nickel stripping solution, which comprises sulfuric acid, hydrogen peroxide, p-hydroxybenzenesulfonic acid, complexing agent, solubilizer and water. The invention also discloses a preparation method of the nickel stripping solution, comprising the following steps: a), mixing and stirring sulfuric acid and water to obtain a sulfuric acid solution; b), dissolving the complexing agent in water, and mixing with the sulfuric acid solution; c), adding The remaining components are mixed to obtain the nickel stripping solution. The invention also discloses the application of the nickel stripping solution in industrial nickel stripping, especially the application in the nickel stripping of PCB (printed circuit board) industry.

Description

technical field [0001] The invention relates to the technical field of chemical nickel stripping, in particular to a nickel stripping solution and a preparation method and application thereof. Background technique [0002] In industrial nickel stripping, when treating the nickel layer on the surface of the substrate, it is necessary to remove the nickel layer on the surface of the substrate. In the background technology, at present, two methods of concentrated nitric acid nickel removal and cyanide nickel removal are commonly used in China to remove the nickel layer. The other method is electrolytic nickel removal, which is rarely used because it is mainly only for the base copper. [0003] PCB (Printed Circuit Board, printed circuit board) electroless nickel plating gold is a process of coating a solderable coating on the surface of the PCB. The process is to electroless nickel-plate the exposed copper surface after the PCB solder mask process, and then Electroless gold pl...

AI Technical Summary

Problems solved by technology

The existing process generally has a high nitrogen content in the solution, and the wastewater is difficult to treat; a large amount of nitrogen oxides such as nitrogen monoxide and nitrogen dioxide produced during the cleaning process will cause harm to the human body, pollute the working environment, and make the operation dangerous. ;The nitric acid solution will corrode the base material to varying degrees and affect the service life of the material, etc.

[0005] Chinese patent CN102268674A discloses a kind of cyanide-free chemical nickel stripping solution, and its component comprises sodium m-nitrobenzene sulfonate, ammonium persulfate, ethylenediamine, sodium diaminodithioformate, aminoacetic acid etc., although it uses organic amine The compound replaces the cyanide-containing compound in the traditional nickel-removing solution as an additive, which can remove the electroplated nickel layer and chemical nickel layer on steel and other substrates, but the additive introduces a large amount of organic amine compound, which increases the nitrogen content of the solution. Wastewater treatment can also become difficult

Chinese patent CN1461822A discloses a nickel or nickel alloy stripping liquid, which selectively dissolves nickel or nickel alloys other than nickel or nickel alloys. The stripping liquid uses hydrogen peroxide, but does not add to inhibit its decomposition. Stabilizer, unstable solution system and other obvious problems

Chinese patent CN103572306A discloses a stripping solution for nickel stripping on copper surface. The stripping solution uses a large amount of nitrogen-containing compounds ethylenediamine, cysteine, sulfamic acid, etc., and the solution has a high nitrogen content. Difficult, at the same time, sulfuric acid and ethylenediamine react with a large amount of heat, the solution temperature is not easy to control, and hydrogen peroxide is easily decomposed by heat

Images