When using potassium chloride acid zinc plating additives, improper control of the plating bath composition can sometimes result in low potassium chloride content. What impact does low potassium chloride content have on the plating bath?
In acid zinc plating baths, potassium chloride serves as the conductive salt. Beyond its conductive function, it enhances cathode polarization and improves the bath's dispersion capability. When the potassium chloride concentration in the plating solution is too low, black streaks tend to form on the surface of the deposit, the bright area shrinks, and the conductivity of the solution deteriorates.
We typically analyze the potassium chloride content in acid zinc plating solutions as follows: First, determine the total chlorine content in the plating solution, subtract the chloride ion content from the zinc chloride, and thereby calculate the potassium chloride content in the solution. However, in practice, the chloride ions added by adjusting the pH with hydrochloric acid are also counted as potassium chloride. Consequently, the actual potassium chloride content in the plating solution will be lower than the calculated value.
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