Acid Zinc Plating
Sep 19, 2023
Zinc plating is a popular process in the manufacturing industry due to its ability to protect metals against corrosion. One of the ways of achieving this is through the use of acidic plating baths. In this article, we will discuss the process of acid zinc plating.
The first step in the process is the preparation of the metal surface. The parts to be plated are cleaned thoroughly to remove any oil, grease or other contaminants that may be present on them. This is typically done using an alkaline cleaner, followed by an acid pickling solution to remove any remaining oxide layers. Once this process is complete, the parts are rinsed with water to remove any acid or cleaner residues.
The next step is the activation of the metal surface. This is done by immersing the parts in an acid solution that contains a small amount of oxidizing agent, typically nickel or copper. This solution helps to remove any remaining oxide layers and provides a clean and activated surface for the plating process.
The acid zinc plating bath consists of a solution of zinc sulfate and sulfuric acid. The concentration of sulfuric acid is typically between 80-120 grams per liter, and the concentration of zinc sulfate is around 25-50 grams per liter. The bath may also contain additives such as wetting agents, brighteners, and inhibitors, depending on the specific requirements of the plating process.
The plating takes place by immersing the parts in the acid bath and applying an electric current to the system. The metal parts act as the cathode, and a zinc anode is placed in the solution. When the current is applied, zinc ions are deposited onto the surface of the metal, forming a protective layer against corrosion.
Finally, the plated parts are rinsed with water to remove any excess plating solution and dried. The finished zinc-plated components are now ready for use.
In summary, acid zinc plating is an effective process for protecting metal components against corrosion. By following the proper procedures and using the appropriate chemical formulations, manufacturers can ensure that their products have a high-quality finish that will withstand the test of time.
