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.

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Description

High content: good conductivity, small resistance, good dispersion ability, anode is not easy to passivation.

Too high: there will be crystallization in winter, little improvement on the electroconductivity of the bath.

Low content: the concentration of potassium chloride is too low, not only the conductivity is poor, and the dispersion ability is reduced, the coating brightness is poor, but also affect the range of cathode current density

Potassium chloride has weak complexation on zinc.

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Boric Acid H3BO3

The main function of boric acid H3BO3 is to inhibit the increase of PH value of the bath, so that the bath PH value remains relatively stable, and the coating can be uniform and bright. When boric acid content is insufficient, the range of cathode current density will be reduced, the current is not open, the coating is easy to burn, resulting in rough gray coating and loss of light. In order to stabilize PH value of bath, it is necessary to maintain proper boric acid content. But the boric acid content should not be too high, if the content is too high, the coating will blossom, so at the general temperature, more than 45g/L will crystallize and precipitate. So the appropriate boric acid content is 30-40g/L, winter to take 30g/L is appropriate, summer boric acid content can be increased to 35-40g/L.

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