Research on Corrosion Behavior of Al2O3 and Al2O3-MnS Inclusions in Non-oriented Silicon Steel
The annealed samples of non-oriented silicon steel were used for in-situ corrosion experiments,and the surface corrosion morphology of the samples was characterized by OM,SEM,EDS and Raman spectroscopy.The results show that the corrosion of non-oriented silicon steel originates from the localized corrosion of inclusions,including metal oxide inclusions Al2O3 and metal oxysulfide inclusions Al2O3-MnS.During the initial corrosion of non-oriented silicon steel,the corrosion products in the circular rust spots are mainly γ-FeOOH and α-Fe2O3,and the content of γ-FeOOH is higher than that of α-Fe2O3.As the color of the corrosion products deepens,the content of α-Fe2O3 gradually increases.
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