The Corrosion Behavior of Pure Iron under Solid Na₂SO₄ Deposit in Wet Oxygen Flow at 500 °C.
The Corrosion Behavior of Pure Iron under Solid Na₂SO₄ Deposit in Wet Oxygen Flow at 500 °C.
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500℃湿氧流中固体Na2SO4沉积物下纯铁的腐蚀行为
DOI：
10.3390/ma7096144
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发表时间：
2014-08-27
期刊：
影响因子：
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通讯作者：
Wang F
中科院分区：
文献类型：
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作者：
Tang Y;Liu L;Fan L;Li Y;Wang F
用热重法和电化学方法研究了纯铁在500℃O2+H2O气氛中在Na2SO4沉积下的腐蚀行为。动电位极化、电化学阻抗谱(EIS)和表面表征方法。X射线衍射仪(X射线衍射仪)、扫描电子显微镜(SEM)/能谱仪(EDS)。结果表明，Na2SO4与O2+H2O之间存在协同作用，显著加快了纯铁的腐蚀速度。简单地说，除了通常的铁氧化物外，还形成了NaFeO2；同时，通过引入水蒸气产生了H_2SO_4气体。随后，由于Na2SO4、NaFeO2和H2O的存在，发生了电化学腐蚀反应。当这与化学腐蚀反应相结合时，促进了化学腐蚀反应的进行，最终导致纯铁的腐蚀加速。
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.