Repeated step-by-step frontward and backward filtering method for electroplating solution

Abstract

The invention provides a repeated step-by-step frontward and backward filtering method for an electroplating solution. According to the method, firstly, primary filtering is carried out on the electroplating solution; after primary rough filtering is carried out to remove large-particle impurities, an electric valve is started; step-by-step frontward filtering, step-by-step backward filtering andrepeated step-by-step frontward and backward filtering are carried out on a filtering solution by adopting each grade of a pressurizing filtering pump and a precision filter, so as to filter a qualified filtering solution to a production electroplating bath. The method comprises the following steps: S1, carrying out the primary filtering; S2, carrying out the step-by-step frontward filtering; S3,carrying out the step-by-step backward filtering; S4, carrying out the repeated step-by-step frontward and backward filtering; S5, filtering before production. By adopting the method, repeated step-by-step frontward and backward flowing filtering of each electroplating waste solution in a whole device is realized, the filtering effect of the electroplating solution can be effectively improved andthe filtering precision is improved; various quality problems caused by pollution of the electroplating solution are reduced and the quality of a plating layer is improved; meanwhile, the contact withan external environment can be reduced to the greatest extent in a filtering process and the pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of electroplating bath filtration, and in particular relates to a method for multi-step forward and reverse filtration of electroplating bath. Background technique [0002] In the field of electroplating bath filtration technology, usually in order to improve the physical properties of the coating, make the coating mirror bright and have good leveling ability, the operator will add main salt, conductive salt, buffer, leveling agent, brightening agent to the electroplating bath. Additives such as agents and anti-pinhole agents. However, in practical applications, the additives in the electroplating bath are easily decomposed and accumulated to form organic impurities during the electrodeposition process, making the electroplating bath easily polluted by organic impurities or inorganic harmful metal impurities. Because the fine solid particles in the plating solution will become the catalytic reduction center...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, impurities are generally separated from the electroplating solution by filtration, because filtration is a physical process, and the substance will not undergo chemical changes during the filtration process. In the prior art, the filtration of the electroplating solution generally uses artificial tank filtration and circulation. There are two forms of filtration; artificial tank filtration is to use a filter pump or manually filter the plating solution in the plating tank of the production line to other clean tanks with filters or filter cloth screens, etc., and then manually clean the plating tank of the production line. Then return the plating solution to the plating solution tank of the production line to supplement and adjust the working solution. Although this kind of tank-turning filtration is more thorough and the filtering effect is remarkable, this method has the disadvantages of high labor intensity for workers and many human factors that lead to the difficulty of filtering the plating solution. Causes defects such as secondary pollution, and also has the disadvantage of low filtration efficiency; circulation filtration is to extract the solution from one end of the working tank near the bottom, and return to the other end of the tank through the filter to keep the plating solution clean

Because the filtered electroplating solution is mixed with the pre-filtered electroplating solution, the solid impurities are gradually reduced, and the filtering effect cannot be achieved, so the efficiency and results are lower than those of artificial tank filtration.

Images