Compared with paint or plastic coating, hot galvanizing coating after hot dip galvanizing equipment processing has better protection effect on steel. During hot-dip galvanization, the zn diffuses with steel to form the ferrozn compound layer, that is, the alloy layer. Both the alloy layer and the steel and zinc are metallurgical bonding, stronger than the paint and steel bonding. The hot galvanized coating will not fall off after decades of exposure to the atmosphere.
When the galvanized layer has small crack or damage, the zinc can prevent the steel in the crack or damage from rusting, which is the advantage of the galvanized layer compared with other coatings. The zinc content of ferrozn alloy layer is more than 90%, which has the same electrochemical protection effect as zinc to steel. Moreover, the hardness of fe-zn alloy layer is higher than that of pure zn layer.
Because the new coating can be dissolved in acid and strong alkali environment, the hot galvanizing layer is only suitable for atmospheric and natural water environment. The galvanized layer is prone to slight electrochemical corrosion when it comes into contact with air and who. Where the air is relatively clean, the life of the galvanized layer will increase, while in coastal areas and industrial pollution areas, the life of the galvanized layer is relatively short. In addition, there have been a lot of data on the durability test of hot galvanizing layer. The data show that the thicker the galvanized layer, the longer the durability, and the durability is proportional to the thickness of the galvanized layer. Of course, according to the test environment, there are some differences in data.
Because the coating will be consumed in the application, when the iron zinc alloy layer is exposed gradually, the surface of the coating will become gray and dull. A small amount of rust in the corrosion products will make the surface of the coating rust color. For easy appear gloomy plating coating, coating with almost no pure zinc layer, hot dip galvanized processing used in plating pieces in the short term will appear this kind of rust, but this does not affect the use, only affect the appearance.
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