1. Hot-dip galvanizing: This involves immersing metal in molten zinc to form a coating. It offers excellent corrosion resistance and mechanical strength and is widely used in construction, bridges, and other fields.
Features: Thick coating (typically 50-150 micrometers), long service life, suitable for outdoor environments.
Process classification: There are two types: with spots (zinc crystals are visible) and without spots (uniform surface), which does not affect performance.
2. Cold galvanizing (electro-galvanizing): A zinc layer is deposited on the metal surface through electrolysis. The thickness is relatively thin (5-30 micrometers), which is suitable for occasions with high aesthetic requirements.
Advantages: Uniform coating, bright appearance, and can undergo color passivation treatment.
Limitations: Its corrosion resistance is weaker than that of hot-dip galvanizing, and it is mostly used indoors or in mildly corrosive environments.

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