Abstract
The corrosion behavior of pure Fe under a Na2SO4 deposit in an atmosphere of O2 + H2O was investigated at 500 °C by thermo gravimetric, and electrochemical measurements, viz. potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and surface characterization methods viz. X-ray diffraction (XRD), and scanning electron microscope (SEM)/energy dispersive spectroscopy(EDS). The results showed that a synergistic effect occurred between Na2SO4 and O2 + H2O, which significantly accelerated the corrosion rate of the pure Fe. Briefly, NaFeO2 was formed in addition to the customary Fe oxides; at the same time, H2SO4 gas was produced by introduction of water vapor. Subsequently, an electrochemical corrosion reaction occurred due to the existence of Na2SO4, NaFeO2, and H2O. When this coupled to the chemical corrosion reaction, the progress of the chemical corrosion reaction was promoted and eventually resulted in the acceleration of the corrosion of the pure Fe.
Highlights
IntroductionShu et al [1,2,3,4] found that the involvement of H2O significantly accelerated the corrosion rate of many pure metals and alloys
In the last decade, it has been found that the corrosion of some pure metals and their alloys such asShu et al [1,2,3,4] found that the involvement of H2O significantly accelerated the corrosion rate of many pure metals and alloys
The highest mass gain was observed when H2O + O2 was introduced together with Na2SO4, which suggests that a synergistic effect exists between Na2SO4 and H2O + O2 on the corrosion process of the pure Fe, which accelerates the corrosion of the pure Fe at 500 °C
Summary
Shu et al [1,2,3,4] found that the involvement of H2O significantly accelerated the corrosion rate of many pure metals and alloys. This is especially the case for pure Cr. This is especially the case for pure Cr Based on this observation, many researchers considered that there might be some electrochemical reactions related to the corrosion process. Electrochemical measurements including cell testing, use of electrodes, and electrochemical impedance spectroscopy (EIS) were set up by the authors and used to study the electrochemical behavior, which confirmed that the electrochemical reactions occurred during the corrosion of pure Fe under a solid NaCl deposit in a water vapor atmosphere [9]
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