Acid Potassium Chloride Zinc Electroplating Brightener

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.

Additive performance evaluation index

High turbidity point: additives with high temperature resistance and low turbidity point are easy to precipitate at high temperature at a certain temperature, resulting in large consumption and poor performance.

High salt resistance: the process range can be expanded, which is conducive to the improvement of electroplating performance. Additives with low salinity tolerance are easy to salt-out, poor performance and large consumption.

High brightness: good performance additive leveling good, current distribution uniform ability, plating ability, high brightness, uniform thickness, good depth ability, light speed.

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