1, extend the service life
Filtration of the solution primarily acts as a purification solution. When the impurities such as oil and dirt in the degreasing liquid are heavy, the degreasing effect is deteriorated, the supplementary material is increased, and the liquid temperature used is increased. If not filtered, the degreaser can usually only be partially or completely renewed. To this end, Mr. Xiang Rong Lao specially developed a degreasing filter, which not only improves the degreasing effect, but also greatly prolongs the service life of the degreasing liquid.
Electroless plating is an autocatalytic reduction process. When there are fine solid particles in the plating solution, it becomes a catalytic reduction center, and the main salt metal ions in the plating solution which are not high in content are not consumed on the workpiece but are quickly reduced on the particles, and the plating solution is consumed. Will expire quickly and be scrapped. Only by timely removing these particles by filtration can the life of the electroless plating solution be ensured or extended.
2. Reduce plating solution failure and improve coating quality
Even if the solid particles in suspension in the plating solution reach the surface of the cathode and adhere to the surface of the plating layer by diffusion, convection, electrophoresis, etc., many defects may occur, resulting in rework or even scrapping of the workpiece. For bright plating, it will reduce the brightness and flatness of the coating, and the product will not be qualified. For example, the dye aggregate in the high dye type bright acid copper liquid produces grit in the plating layer, and the Cu2O copper powder in the copper acid solution generates Cu2O copper powder to lose the light, slow the light, and adjust the level; Fe in the nickel plating solution ( OH)3 causes pinholes and pittings in the coating; after the porosity of the coating is high, the corrosion resistance is greatly reduced, and sometimes the plating layer has to be thickened, resulting in a decrease in production efficiency and an increase in cost; and various large mechanical particles cause burrs of plating. Rough and must be reworked. Any mechanical impurities that are suspended or coarse can only be removed by careful filtration of the bath.
Only by keeping the bath highly clean, can it reduce failures, reduce rework, improve quality, reduce overall costs, and improve market competitiveness.
3, remove plating impurities
It is inevitable that the plating solution will generate and accumulate various harmful impurities. When it exceeds the allowable value, it causes various failures. There are several ways to remove impurities:
(1) Various mechanical impurities are directly removed by filtration.
(2) Mechanical impurities formed by conversion, removed after filtration.
For example, excessive Cl- and Cu+ in the copper acid solution form CuCl precipitation, Fe3+ in the nickel or chloride galvanizing solution forms Fe(OH)3 precipitate, and Fe2+ in the HEDP copper plating solution forms Fe(OH)2 precipitate. . Direct filtration removes these impurities. CO2-3 is inevitably produced in the alkaline plating solution, which is harmful when excessive. In the cyanide copper plating and zincate galvanizing solution, too much C02-3 is saturated and crystallized into solid Na2CO3·nH2O when the liquid temperature is low, and can be removed after filtration.
(3) The soluble impurities are removed by filtration in a solid form.
This article is reproduced from Gu'an Xinyang Filter Factory: http://
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