Corrosion Behavior of Fe13Cr5A14Mo Alloy in LiOH Aqueous Solution at 360 ℃/18.6 MPa
The corrosion behavior of Fe13Cr5A14Mo alloy in 70 μg/mL LiOH aqueous solution at 360 ℃/18.6 MPa was studied using a static autoclave to assess its corrosion resistance.The microstructure of the oxide film on the Fe13Cr5A14Mo alloy after corrosion was investigated by SEM,TEM and EDS.The results show that the Fe13Cr5A14Mo alloy exhibits corrosion mass loss in LiOH aqueous solution,which is related to the dissolution-redeposition process of Fe oxide affected by LiOH.The oxide film formed on the alloy during the long-term corrosion in LiOH aqueous solution is mainly composed of Fe(Cr,Al)2O4,and a small amount of Fe3O4 exists near the outer surface.The Fe(Cr,Al)2O4 layer can hinder the diffusion of metal ions and oxygen ions within the oxide film,which in turn retards further corrosion of the alloy.
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