Acid Potassium Chloride Zinc Electroplating Brightener

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.

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Description

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.

20230722160756-025

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.

20230722160528-017