Alkaline zinc plating is an electroplating technology that mainly uses zincate plating solution for electroplating. Zinc is deposited on the metal surface through electrolytic reduction, thereby improving the metal's corrosion resistance and appearance quality. This process uses zinc oxide as the main salt and sodium hydroxide as the complexing agent. When the power is on, a layer of metallic zinc
Author: Marisa
Alkaline zinc plating is an electroplating technology that mainly uses zincate plating solution for electroplating. Zinc is deposited on the metal surface through electrolytic reduction, thereby improving the metal's corrosion resistance and appearance quality. This process uses zinc oxide as the main salt and sodium hydroxide as the complexing agent. When the power is on, a layer of metallic zinc is plated on the surface of the metal or other materials to increase the corrosion resistance and decorativeness of the material. The characteristics of alkaline zinc plating include simple and stable plating solution composition, wide range of use, no corrosiveness to electroplating equipment, fine and bright coating crystals, low cost, wide source of raw materials, stable bath solution, and easy to master. In order to make the coating achieve the effect of fine crystals and brightness, an appropriate amount of additives must be added. Alkaline zinc plating process is widely used in various metal surface treatments, especially in the automotive, electronics and other industries.
The alkaline zinc plating process mainly includes the following steps:
A. Pretreatment stage:
1. Degreasing: First, remove the oil stains on the surface of the workpiece by alkaline solution or organic solvent.
2. Pickling: Then, the workpiece is pickled to remove scale and rust.
3. Water washing: Rinse thoroughly with clean water to ensure the surface is clean.
B. Electroplating stage:
1. Place the pretreated workpiece in an electroplating tank filled with alkaline zincate solution.
2. Apply direct current to reduce and deposit zinc ions on the surface of the workpiece under the action of the electric field to form a uniform and dense coating.
C. Post-treatment stage:
Passivation treatment: After the coating is formed, the workpiece is usually passivated to further improve the corrosion resistance. In the trivalent chromium passivation process, a dense passivation film is formed, making the coating appear brighter and more corrosion-resistant.
In addition, the alkaline galvanizing process has high pre-treatment requirements, including chemical degreasing, pickling degreasing and rust removal, electrolytic degreasing and other steps to ensure that the surface of the workpiece is clean, which is conducive to the subsequent electroplating process.