Zinc Plating Additive Acid Type Of Potassium
The coating has high brightness, low brittleness, turbidity point of the bath can reach more than 80℃, and bright coating can be plated at 65℃. Its comprehensive performance can be completely comparable with similar foreign products, characteristics are as follows: 1. The bath does not contain ammonium, the wastewater is not polluted and easy to treat. 2. The coating is bright, suitable for low chromium passivation. 3. Adaptable to all kinds of basic materials, such as carbon steel, penetrant steel, cast iron, zinc pressure casting parts can be plated with bright zinc layer. 4. Coating brittleness is small, suitable for thicker zinc plating layer. 5. Additive consumption is low, plating solution maintenance is easy, conducive to reducing production costs. 6. The bath foam is low, both barrel and rack plating can be used. 7. Bath temperature range is wide.
Description
The copper ions in the plating solution mainly come from the copper rod, copper hanger, copper hook, zinc anode and so on falling into the aqueduct and self-dissolving. Raw materials into, especially zinc chloride content is higher, when the plating solution Cu2+ concentration is more than 10mg/L, the coating is gray black, copper impurities will cause low current area dark, high content in the plating solution, after nitric acid light plating brown, plating passivation is not bright, hair and black. The treatment method is generally better with replacement method, that is, 1-2g/L zinc powder is added into the aqueduct, fully stirred, standing for 1 hour and then filtered. Small current electrolysis, the PH value adjusted to 3-4, control the cathode current in 0.1-0.2a /dm2, so that Cu2+ reduction on the cathode to remove, such as the roller electrolysis to use parts with plating electrolysis, to avoid the generation of bivalent iron impurities.
Copper impurities mainly lie in the prevention of ordinary times, galvanized anode is best to use No. 0 zinc ingot, followed by the prevention of copper rod, copper hook and hanging device falling into the aqueduct, but also to prevent the patina falling into the aqueduct.
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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