Influence of Conductivity on Corrosion Behavior of 304 Stainless Steel in High Temperature Aqueous Environment

doi:10.1016/j.jmst.2015.12.008

Abstract

Abstract: The influence of conductivity on corrosion behavior of 304 stainless steel (SS) in high temperature water was investigated by using in-situ potentiodynamic polarization curves, electrochemical impedance spectra (EIS) at 300 °C, and ex-situ scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The structures of oxide films formed on 304 SS change with different conductivities at 300 °C. With the increase in conductivity, the passive current density increases while the resistances of oxide films decrease. But the resistances do not decrease lineally with the increase in conductivity. A modified double-layer model for oxide structure was proposed to explain the influence mechanism of conductivity on the oxide films on 304 SS in high temperature water. Improving the ¹⁰B enrichment level can reduce the conductivity of primary water and increase the corrosion resistance of 304 SS.

Key words: Stainless steel, Polarization, Electrochemical impedance spectra, High temperature corrosion

Jiazhen Wang, Jianqiu Wang, En-Hou Han. Influence of Conductivity on Corrosion Behavior of 304 Stainless Steel in High Temperature Aqueous Environment[J]. J. Mater. Sci. Technol., 2016, 32(4): 333-340.

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