Hot-dip galvanized coatings offer far better protection for steel than paint or plastic coatings. During hot-dip galvanizing, zinc diffuses between the zinc and steel to form an intermetallic compound layer, i.e., an alloy layer.
When the galvanized layer has small cracks or damage, the zinc continues to prevent the steel at the crack or damage site from rusting into a sacrificial anode. This is the main feature that makes the galvanized layer superior to other coatings.
Because zinc can dissolve in acids and strong alkalis, hot-dip galvanizing is only suitable for general atmospheric and natural water environments. When the zinc plating comes into contact with air and water, it will undergo slight electrochemical corrosion. In rural areas and areas with relatively clean air, the galvanized coating can last for many years, while in polluted industrial areas and coastal areas, the service life of the galvanized coating is shorter. Furthermore, the thicker the coating, the longer the service life; the service life is almost directly proportional to the thickness. 

Time：15/05/2026 16:42:34

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