The use of trivalent chromium colored zinc passivation solution can sometimes result in poor adhesion and easy detachment of the passivation film on the coating during the production process.
Based on on-site experience and product characteristics, Bigely Technology has analyzed this phenomenon and summarized 5 methods to prevent passivation film detachment of products:
1. The galvanizing solution should be analyzed and adjusted in a timely manner. Whether it is acid zinc plating solution or alkali zinc plating solution, it is necessary to ensure that the concentration of the plating solution components is within the process range.
2. Control the current density during the galvanizing process. Although high current can improve the deposition rate, it can easily cause excessive organic impurities in the coating, resulting in high brittleness of the coating. The passivation film obtained in this way is prone to fogging, dullness, and poor adhesion.
3. Regularly perform aging treatment on the passivation tank. After working for a period of time, the passivation effect of the passivation solution will decrease due to the influence of zinc ions and iron ions. Regularly aging the passivation solution and replenishing the original solution can improve the passivation effect of the passivation solution and prevent the phenomenon of film detachment on the workpiece.
4. The workpiece should be washed clean. When the workpiece comes out of the galvanizing tank, the organic film adsorbed on the surface should be cleaned as much as possible to ensure good adhesion of the passivation film.
5. Baking and curing are important. The process of baking and curing the workpiece after color zinc passivation is very important, as it can package the passivation film with strong adhesion and improve the corrosion resistance of the coating.
Remembering the above 5 points can prevent the phenomenon of passivation film detachment in products and help us better use trivalent chromium colored zinc passivation solution. If you want to learn more about trivalent chromium colored zinc passivation solution, please feel free to call us for consultation. Bigely Technology is always at your service!
