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采用Tafel极化曲线法和电化学阻抗法研究了690合金在乙醇胺(ETA)和全挥发处理(AVT)两种水工况下的电化学行为,并着重考察了pH值、温度、Cl-和SO42-对690合金电化学性能的影响.结果表明,在两种不同水工况下,pH值升高会提高690合金的耐蚀性,而温度升高和Cl-,SO42-的加入则均会加速690合金的腐蚀.在相同条件下,690合金与ETA水工况有更好的兼容性,ETA的缓蚀性能优于NH3.
The electrochemical behavior of 690 alloy under two water conditions of ethanolamine (ETA) and total volatilization (AVT) was investigated by Tafel polarization curve and electrochemical impedance spectroscopy. The effects of pH value, temperature, Cl- and SO42- on the electrochemical properties of 690 alloy.The results show that under two different water conditions, the pH value will increase the corrosion resistance of 690 alloy, while the temperature and Cl-, SO42- are added Will accelerate the corrosion of alloy 690. Under the same conditions, 690 alloy with ETA water conditions have better compatibility, corrosion inhibition ETA better than NH3.