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Protective Properties Of Folded Hot Galvanizing Layer

- Apr 10, 2018 -

Protective properties of folded hot galvanizing layer.

Generally, the thickness of the electrogalvanizing layer is 5 ~ 15 mu m, while the hot galvanizing layer is usually above 35 mu m, and even up to 200 mu m.Hot galvanizing coating is good, the coating is dense, no organic matter inclusions.As is known to all, the mechanism of resistance to atmospheric corrosion of zinc have mechanical and electrochemical protection, under the condition of atmospheric corrosion of zinc layer surface of ZnO, zinc (OH) 2 and alkali carbonate zinc coating, to a certain extent reduce the corrosion of zinc, this layer of protective film (also called white rust) is damaged and will form a new film.Destroyed when the zinc layer, endanger the iron matrix, the zinc electrochemical protection on the substrate, the standard potential of zinc - 0.76 V, iron the standard potential of 0.44 V, zinc and iron to form the micro battery zinc as the anode is dissolved, iron are protected as the cathode.It is obvious that the anti - atmospheric corrosion ability of hot - galvanizing metal iron is better than that of electrogalvanizing.