Acid Potassium Chloride Zinc Electroplating Brightener

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.

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Description

Low zinc chloride content: can appropriately improve the dispersion ability

When it is too low, the concentration polarization will increase, the current will not open much, the upper limit of the current density will decrease, the high current density area will appear charring phenomenon, and the bright area will narrow.

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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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