The difference between electrogalvanizing and hot-dip galvanizing operation process
release time：
2025-05-16 09:30
Electrogalvanizing
Pretreatment: including degreasing, pickling, activation and other steps to remove oil, rust and oxide scale on the surface of the workpiece, so that the surface of the workpiece is clean and activated, which is conducive to the deposition of zinc ions.
Electroplating: immerse the pre-treated workpiece in the electroplating tank and connect the power supply for electroplating. During the electroplating process, it is necessary to strictly control the process parameters such as current density, temperature, pH value, etc. to ensure the quality of the coating.
Post-treatment: After electroplating, the workpiece needs to be passivated, cleaned, dried and other post-treatment processes. Passivation treatment can improve the corrosion resistance of the coating. Common passivation methods include chromate passivation and chromium-free passivation.
Hot-dip galvanizing
Pretreatment: mainly degreasing, pickling, water washing, plating assistance and other treatments. Degreasing is to remove grease on the surface of the workpiece; pickling can remove oxide scale and rust on the surface of the workpiece; plating assistance treatment is to form a protective film on the surface of the workpiece to prevent the workpiece from being oxidized again before being immersed in the zinc liquid, and to help the zinc liquid to wet the surface of the workpiece.
Hot-dip galvanizing: The pre-treated workpiece is immersed in molten zinc liquid for a certain period of time to form a uniform zinc-iron alloy coating on the surface of the workpiece. The galvanizing time depends on the material, size and coating thickness requirements of the workpiece.
Post-treatment: The workpiece after hot-dip galvanizing needs to be cooled, passivated, leveled, etc. Cooling can prevent the workpiece from deforming due to excessive temperature; passivation treatment can further improve the corrosion resistance of the coating; leveling treatment is to improve the flatness of the workpiece surface.
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