Acid Potassium Chloride Zinc Electroplating Brightener

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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Description

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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In addition, we should pay attention to the quality of boric acid and prevent the interference of nitrate and other factors.

Note: The brightness of the galvanized layer caused by the lack of boric acid is not enough, and the addition of brightener is of no avail. But after the addition of boric acid, the coating is immediately bright, which is the defect caused by the poor buffering performance of the plating solution of boric acid. Therefore, the role of boric acid must not be ignored in production, and its content should be guaranteed within the process range. In daily production, when the PH value of the bath changes quickly, it indicates that the boric acid content in the bath has been low, and it needs to be added. Boric acid is only taken out of consumption. As a rule of thumb, you only need to supplement boric acid with potassium chloride. The supplement amount is 1/7 of the weight of potassium chloride, that is, for every 7 kilograms of potassium chloride, you need to also add 1 kilogram of boric acid. In addition to boric acid should be fully dissolved after adding, otherwise it can not play its due role.

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