Corrosion and protection of channel steel-B


The other method is galvanized anti-corrosion protection: hot-dip galvanized channel steel can be divided into hot-dip galvanized channel steel and hot-blown galvanized channel steel according to different galvanizing processes. The derusted steel is immersed in 440~460 In the molten zinc at about , a zinc layer is attached to the surface of the steel component to achieve the purpose of corrosion protection. In the general atmosphere, a very thin and dense zinc oxide layer is formed on the surface of the zinc layer, which is difficult to dissolve in water, so it plays a certain protective effect on the channel steel. If zinc oxide and other components in the atmosphere form insoluble zinc salt, the anti-corrosion effect is more ideal. The corrosion resistance of channel steel is mainly determined by the thickness of the galvanized layer. Covering the surface of the channel steel with a thicker and dense pure zinc layer can avoid the channel steel matrix from contacting any corrosive solution. The corrosion resistance is very strong and protect the channel steel. It is protected from corrosion and can be firmly bonded to the steel structure for a long time to prevent damage to the surface.

Zinc is not easy to change in dry air, while in humid air, a very dense galvanized film can be formed on the surface. The surface of the channel steel after galvanizing treatment will be very beautiful, and it has strong corrosion resistance. Sex. In the liquid state of zinc, after quite complicated physical and chemical action, not only a thicker zinc layer is plated on the channel steel fixture, but also a zinc-iron alloy layer is formed. This plating method not only has the characteristics of corrosion resistance, but also has an iron-zinc alloy layer, combined with compactness, and exhibits unique corrosion resistance in marine salt spray atmosphere and industrial atmosphere. Therefore, it is especially suitable for strong corrosive environments such as strong acids and alkali mist. In order to make the channel steel have certain corrosion resistance and at the same time give the product a decorative appearance, it is generally surface treated by galvanizing.

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