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

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.

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.

20231007111840

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.

20231007112316