Alkaline zinc plating is a surface treatment process widely used in industry to provide coatings that not only provide excellent corrosion protection but also have an aesthetically pleasing appearance.
Author: Marisa
Alkaline zinc plating is a surface treatment process widely used in industry to provide coatings that not only provide excellent corrosion protection but also have an aesthetically pleasing appearance.
However, in practice, poor ductility of the coating often becomes a problem that troubles processors, especially when the coating thickness reaches 20 microns. What is the root cause of this problem? Let's take a closer look.
During the alkaline zinc electroplating process, the increase in thickness will affect the physical properties of the coating. As the thickness of the zinc coating increases, the stress of the coating will gradually accumulate, which may eventually lead to poor ductility of the coating. This is mainly because the internal stress formed during the electroplating process increases with the increase in layer thickness, making the coating more fragile.
In addition to the increase in physical stress, the influence of chemical composition and process parameters are also key factors. Appropriate additives play a vital role in the quality of the coating. Especially when the coating is thick, traditional additives often cannot effectively suppress the accumulation of internal stress in the coating, resulting in poor ductility.
In actual operation, using the correct alkaline zinc brightener is only one aspect of solving the problem of coating ductility. It is also necessary to reasonably control process parameters, such as current density and temperature, to improve the quality of the coating. By optimizing the process parameters, the formation of internal stress in the coating can be further reduced, and the ductility and adhesion of the coating can be improved.
Conclusion
In general, the problem of poor coating ductility mainly stems from the accumulation of internal stress and improper use of additives. Selecting appropriate additives and strictly controlling process conditions can improve the physical properties of the coating and ensure that the coating can still maintain good ductility and durability when the coating is thick. This not only improves the service life of the product, but also provides technical support for industrial production.