Acid Potassium Chloride Zinc Electroplating Brightener
Additives play an important role in plating solution. In general, additives are added according to KA.h consumption. If the proportion is out of proportion, add it according to the bath volume after adjusting by hull bath experiment. Without additive plating solution, the coating is gray and rough, and the range of cathode current density is very small. After adding appropriate amount of additives, the coating can be fine and bright, the current density is expanded, the dispersion ability and covering ability are improved, too high additives will cause brittleness of the coating, passivation film fall off and color change. The general total amount should be controlled within the range of 25-30ml/L.
Description
Brightener
The main brightener can produce remarkable brightening and leveling effect.
If the content is too high, the coating in the low current density area will become thinner, and the bottom will be exposed after passivation, which will easily lead to increased brittleness of the coating and affect the passivation quality.
The content is too low, the coating bright leveling effect is not good. The content in the bath is maintained at 0.8-2ml/L.
Softener
Solubilizing main brightener, auxiliary brightening effect, increase the coating thickness in low area, improve the depth capacity of the bath, reduce the surface tension of the bath, on the cathode surface wetting effect.
The content in the bath is 25ml/L - 30ml/L
The coating brittleness increases and passivation quality is affected by high content.
The content is too low, the bright effect is not good, the coating is easy to flower, stay in the air and change color quickly.
PH value
When the PH value of the bath is low, the coating is bright but hydrogen precipitates out, the current efficiency is reduced, and the covering ability is decreased. High PH value, coating rough black, local gray black. Usually the PH value will rise slowly in the process of electroplating, then pay attention to adjust the PH value with dilute hydrochloric acid in time. Adjust the PH value to constantly stir, to prevent the local acidity is too high and cause the additive precipitation. General bath PH value should be controlled in the range of 4.5-5.4, with 4.8 as the best.
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