Acid Potassium Chloride Zinc Electroplating Softener

Zinc chloride as the main salt, is also a conductive salt, it in the plating solution all ionized into chloride ions and zinc ions, ionized zinc ions will be directly on the plating part of the cathode reduction into a coating, can increase the conductivity of the plating solution, its concentration allowed to change in a wide range. It is easy to absorb moisture, easy to dissolve, exothermic phenomenon.

Zinc chloride provides zinc ions. When the content of ZnCl12 is set to the upper limit, the cathode current density can be improved and the deposition rate of the coating can be improved, but the dispersion ability and covering ability become worse. When the content of ZnCl12 is set to the lower limit, the dispersion ability can be improved, the loss of the plating parts taking out liquid and the cost of tank fitting and wastewater treatment can be reduced. When the content of ZnCl12 is too low, the concentration polarization will be large, resulting in low current opening, which will narrow the bright area of the plating, decrease the cathode current density accordingly, slow down the deposition rate, and prone to charring phenomenon in the high current density area of the plating.

In the production practice, as long as the additive selection is appropriate, the content of zinc chloride can be increased, even if the current density is increased, the coating will not appear burning phenomenon on the surface of the plating, so as to ensure the quality of the coating and improve the output.

For the matrix metal that is difficult to electroplate, such as cast iron, the zinc content should be upper limit to increase the cathode limit current density, and the zinc content should be lower limit in summer.

The concentration of zinc chloride can vary in the range of 40-80g/L, in principle, the content of hanging plating is lower than that of rolling plating. If there is a hanging bath with moving cathode, the content of zinc chloride should be 45-60g/L. If there is no cathode moving device, the content of zinc chloride should be 60-80g/L. According to experience, the loss of 1 ton parts per plating is 4-5 kg.

Potassium Chloride

Although chloride ion has a weak coordination effect on zinc, potassium chloride in the solution in addition to play a conductive role in an active anode, that is, to promote the anode normal solvent. The concentration is generally controlled in 200-280g/L. The content of potassium chloride in the bath is high, the conductivity of the bath is good, but too high will affect the solution of additives in the bath, so that the brightness of the coating decreases. The concentration of potassium chloride is too high, the crystallization will be precipitated below 5℃ in winter. The concentration of potassium chloride is too low, not only the conductivity is poor, but also the dispersion and covering ability of the plating solution is reduced, the brightness of the coating is poor, and the range of current density is narrow. KCL should be analyzed and supplemented regularly. General KCL concentration is controlled at about 240g-260g/L. According to the experience of plating 1 ton parts to take out 5-7 kg.

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