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Materials 2014, 7(9), 6144-6157; doi:10.3390/ma7096144

The Corrosion Behavior of Pure Iron under Solid Na2SO4 Deposit in Wet Oxygen Flow at 500 °C

1,* , 1
1,*  and 1
1 Institute of Metal Research, Chinese Academy of Sciences, Wencui Road 62, Shenyang 110016, Liaoning, China 2 Key Laboratory of Durability Technology for Harbor and Marine Structure Ministry of Communications, CCCC Fourth Harbor Engineering Institute Co., Ltd., Qianjin Road 157, Guangzhou 510230, Guangdong, China
* Authors to whom correspondence should be addressed.
Received: 29 April 2014 / Revised: 3 June 2014 / Accepted: 11 August 2014 / Published: 27 August 2014
(This article belongs to the Special Issue Corrosion of Materials)
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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.
Keywords: electrochemical reaction; Na2SO4 + O2 + H2O; corrosion behavior electrochemical reaction; Na2SO4 + O2 + H2O; corrosion behavior
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tang, Y.; Liu, L.; Fan, L.; Li, Y.; Wang, F. The Corrosion Behavior of Pure Iron under Solid Na2SO4 Deposit in Wet Oxygen Flow at 500 °C. Materials 2014, 7, 6144-6157.

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