What are the main substances of iron oxide scale?

In steel forging and hot rolling hot processing, due to the reaction of iron in steel and air, iron oxide scale is often formed in large quantities, causing accumulation and wasting resources. If these resources are used rationally, the production cost can be reduced, and at the same time, it can play an environmental protection and energy saving role. The main components of the iron oxide scale are Fe2O3, Fe3O4, and FeO. Among them, the outermost layer of iron oxide skin is Fe2O3, which accounts for about 10% of the thickness of the iron oxide scale, and prevents oxidation; the middle is Fe3O4, about 50%, and the innermost contact with iron is FeO, about 40%.

Generally, there are three layers of iron oxide scale: the outermost layer is Fe2O3, which accounts for about 10% of the thickness of the whole scale, and its properties are: fine, shiny, crisp, easy to fall off; and has the effect of preventing the internal violent oxidation from continuing; The second layer is a mixture of Fe2O3 and FeO, usually written as Fe3O4, which accounts for about 50% of the total thickness; the third layer connected to the metal body is FeO, which accounts for about 40% of the thickness of the scale, and the properties of FeO are sticky and sticky. The steel material is not easy to remove.

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