What are the reasons for the poor adhesion and blistering of the galvanized layer on the workpiece during the production process using acidic zinc plating brightener?
1.The oil stains on the surface of the workpiece have not been completely removed. Usually, oil is removed through chemical or electrolytic methods, but the oil stains are not completely removed. If the operation is improper or the composition of the degreasing fluid is imbalanced, it may cause bubbles in the galvanized layer due to residual oil on the surface of the workpiece.
2.The pickling time is too long. During the process of acid pickling and rust removal, if the workpiece is soaked for too long, it will cause blistering of the galvanized layer due to excessive corrosion.
3.Improper selection of hanging equipment. Hangers are made by soldering hooks and rods together with solder or copper, and then wrapping them with plastic or paint. If the wrapping is damaged or the welding area is susceptible to electrolyte corrosion, the corrosion products will adhere to the surface of the workpiece, and the workpiece will produce dense small bubbles in a strip shape from top to bottom, causing blistering of the galvanized layer.
4.Improper operation or maintenance of plating solution. When the content of acidic zinc plating brightener in the plating solution is too high, it is easy to get mixed in the galvanized layer, causing a sharp increase in internal stress and leading to blistering of the galvanized layer.
5.The content of metal impurities is too high. Excessive impurities such as copper and lead in the plating solution can lead to the inclusion of too many impurities in the galvanized layer, resulting in poor adhesion and blistering between the coating and the substrate.
6.Improper control of operating conditions. Improper operating conditions during the production process, such as low temperature and high current density, can also lead to the inclusion of organic impurities in the galvanized layer, causing blistering.
7.The impact of passivation process after plating. Improper light emission and passivation operations, incomplete cleaning, and residual light emission or passivation solution in the coating after zinc plating can easily cause blistering of the galvanized layer.
Therefore, in the production process of using acidic zinc plating brightener, the reasons for poor adhesion and blistering of the galvanized layer on the workpiece are basically the above 7 points. If you would like to learn more about acid zinc plating brighteners, please feel free to call us for consultation. Bigely Technology is always at your service.
