Acid Potassium Chloride Zinc Electroplating Softener
Once the potassium chloride galvanized solution is contaminated by hexavalent chromium, the source of the pollution should be found out first, and the source should be blocked first. The treatment method of hexavalent chromium is to use insurance powder, first reduce hexavalent chromium to trivalent chromium, and then adjust the PH value of the solution to about 6.0, precipitation and filtration.
Description
The effect of nitrate
Nitrate is also a strong oxidizer, the brightener has a certain damage, generally nitrate ion should be less than 0.5g/L, a small amount of nitrate ion can be used for a long time electrolytic treatment of small current density, if the content is too high, can only replace the solution.
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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