Differences in coating characteristics between electrogalvanizing and hot-dip galvanizing
release time：
2025-05-16 09:31
Coating thickness
Electrogalvanizing: The coating thickness is relatively thin, generally between 5-15μm. The coating thickness can be adjusted by controlling parameters such as electroplating time and current density, but the thickness range is relatively narrow.
Hot-dip galvanizing: The coating thickness is thicker, usually above 45-85μm, and can even reach above 100μm. The coating thickness of hot-dip galvanizing can be adjusted according to the use environment and requirements of the workpiece, and has better corrosion resistance.
Coating structure
Electrogalvanizing: The coating is mainly composed of pure zinc, with a relatively uniform and dense structure, but the bonding force with the substrate is slightly weaker than hot-dip galvanizing.
Hot-dip galvanizing: The coating is a zinc-iron alloy layer, which is a pure zinc layer, an alloy layer, and a base metal from the outside to the inside. A metallurgical bond is formed between the alloy layer and the base metal, with a strong bonding force and not easy to fall off.
Appearance quality
Electrogalvanizing: The appearance is relatively smooth and delicate, with uniform color, and various surface treatments can be performed, such as color passivation, black passivation, etc., to meet different appearance requirements.
Hot-dip galvanizing: The appearance is relatively rough, and there may be defects such as zinc nodules and burrs on the surface, but they can be improved through subsequent leveling treatment. The appearance color of hot-dip galvanizing is generally silver-white.
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