Acid Potassium Chloride Zinc Electroplating Brightener
Zinc chloride provides zinc ions. When the content of ZnCl12 is set to the upper limit, the cathode current density can be improved and the deposition rate of the coating can be improved, but the dispersion ability and covering ability become worse. When the content of ZnCl12 is set to the lower limit, the dispersion ability can be improved, the loss of the plating parts taking out liquid and the cost of tank fitting and wastewater treatment can be reduced. When the content of ZnCl12 is too low, the concentration polarization will be large, resulting in low current opening, which will narrow the bright area of the plating, decrease the cathode current density accordingly, slow down the deposition rate, and prone to charring phenomenon in the high current density area of the plating.
Description
High zinc chloride content: can improve cathode current density and cathode current efficiency
Reduce dispersion and coverage
High content makes the coating rough easily
Low zinc chloride content: can appropriately improve the dispersion ability
When it is too low, the concentration polarization will increase, the current will not open much, the upper limit of the current density will decrease, the high current density area will appear charring phenomenon, and the bright area will narrow.
Common failures and processing method
|
Problem Description |
Probable cause |
Solutions |
|
Poor brightness |
Lack of brightener Lack of softener Organic impurity pollution |
Brightener supplement Softener supplement Activated carbon filtration |
|
Poor coverage No coating in hole and concave
|
Lack of brightener Lack of softener Low potassium chloride The bath temperature becomes higher Aluminum impurity pollution |
Brightener supplement Softener supplement Potassium chloride supplement Lowering temperature Treat with zinc powder |
|
The bright range is narrow and the coating is easy to burn |
The PH value of the bath increases Lack of zinc Lack of boric acid Lack of softener |
Adjust PH value with dilute hydrochloric acid Zinc chloride supplement Boric acid supplement Softener supplement |
|
The coating has white mist |
Effect of organic impurities Poor cleaning after plating |
Activated carbon filtration Change the cleaning water |
|
The coating blackening after acid dipping |
Iron impurity Copper impurity |
Hydrogen peroxide treatment and filtration Treat with zinc powder |
|
Roller holes appear in the coating |
Lack of softener Iron impurity Excessive current Lower zinc Over loading of work |
Softener supplement Hydrogen peroxide treatment and filtration Lower total current Zinc chloride supplement Reduced loading |
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