Some customers inquired that in the production process of using acid zinc brightener, the workpiece low concavity of the plating layer appeared to be dark and not bright phenomenon, what is the reason for this?
Bigely technology based on field experience and product acid galvanizing brightener BZ-528 characteristics of the analysis, this phenomenon is mainly the following in five cases:
1, small current density. In the galvanizing process, the current density is low, the deposition rate of the coating is slow, the current area can not get a good galvanized layer, thus appearing the phenomenon of dark and not bright. Generally this phenomenon should be appropriate to increase the flow, to the corners of the workpiece just bubble precipitation can be.
2. The temperature of the plating solution is too high. In acid zinc plating solution, when the temperature is high, the cathodic polarization is reduced, the plating layer will be rough, and the phenomenon of darkening and not bright. We should use a thermometer to measure the temperature of the plating solution in the production process, and take cooling measures when the temperature exceeds 32℃.
3、Low concentration of main salt in plating solution. In acid zinc plating solution, when the concentration of potassium chloride and zinc chloride is low, the dispersing ability of the plating solution is poor, and the thickness of the plating layer in the low current area is thin and the brightness is poor. Therefore, we should regularly analyze and adjust the concentration of the main salts in the plating solution during the production process.
4. Insufficient brightener. In acid zinc plating solution, appropriate brightener can improve the brightness and leveling effect of the plating layer in the low current area. When the concentration of brightener is insufficient, the alignment of the plating layer is poor, and the plating layer in the low current area will have poor brightness. Therefore, we can use Hull tank test to control the balance of brightener and softener in the production process.
5, the plating solution has more impurities in the impact. Acid zinc plating solution in copper, lead impurities or more organic impurities, will also lead to galvanized layer low current area is not bright. Therefore, we can use small current electrolysis or zinc powder in the production process to deal with metal impurities in the plating solution, and can also use activated carbon to deal with organic impurities in the plating solution.
Therefore, we need to pay attention to the above 5 points in the production process of using acid zinc brightener, which can effectively avoid the plating layer in the low concave part of the workpiece to appear dark and not bright, and reduce the occurrence of failures. If you are interested in acid zinc brightener, please contact Bigely customer service for free samples and detailed technical information!
