1. Good corrosion resistance
The zinc layer does not change in dry air, but it will form a film mainly composed of alkali and zinc carbonate in humid air, which can play an anti-corrosion role. Like the hot-dip galvanized coating, since the electrode potential of zinc is more negative than that of iron, when forming an iron-zinc primary battery, the galvanized layer is the anode, which can effectively protect the base steel from electrochemical corrosion.
2. Beautiful and storage-resistant
The passivation film of various colors may be obtained after passivation treatment on the galvanized layer, and the film has good aesthetics. In particular, the iridescent film has the function of re-scratching and self-repairing, which can restore the scratched passivation film to its integrity, which is why electro-galvanized coatings often use iridescent passivation.
3. Low cost
The thickness of the hot-dip galvanized layer is generally 60-305g/㎡ (60-300μm on one side), while the thickness of the electro-galvanized layer is 5-50g/㎡ (6-12μm on one side), which saves a lot of zinc and cost compared with hot-dip galvanizing. naturally lowered.
In engineering, the zinc layer of iron and steel workpieces is mainly a protective galvanized layer, which accounts for 1/3~1/2 of all electroplated parts, and is a plating type with a large output among all electroplating varieties.
