用动电位极化曲线、扫描电镜(SEM)和电化学阻抗谱技术(EIS)研究了HCO-3对J55钢在1%NaCl溶液中的腐蚀行为的影响.结果表明,HCO-3浓度越大阳极反应速率越小.当HCO-3浓度高于0.060 mol/L时HCO-3呈现出钝化特征.随着NaCl溶液中HCO-3量的增加,Rt增大,腐蚀速度减小.J55钢在含NaHCO3为374 mg/L的溶液中腐蚀的电化学阻抗谱中出现了感抗,在含NaHCO3为30 g/L的溶液中腐蚀的的电化学阻抗谱出现了Warburg阻抗,在含NaHCO3为1、5和84g/L的溶液中腐蚀的电化学阻抗谱仅出现单容抗弧特征.随着HCO-3浓度的增大阴极反应速率越来越大.极化电位为-0.9 V附近,随着极化电位的增大极化电流出现了突增.
Effect of HCO-3 ion on corrosion behavior of J55 steel in 1%NaCl solution was examined using potentiodynamic polarizations scanning electron microscope(SEM)and electrochemical impedance spectroscopy(EIS).The results showed that the rate of anodic reaction will reduce along with the increase of concentration of HCO-3.When the concentration of HCO-3 is above 0060 mol/L HCO-3 it is passivated.Electrochemical transfer resistance will increase with the increase of concentration of HCO-3,so corrosion rate will decrease.The electrochemical impedance spectroscopy presents inductance resistance when the concentration of HCO-3 is 374 mg/L.There is Warburg impedance when the concentration of HCO-3 is 30 g/L.Besides,The electrochemical impedance spectroscopy presents single capacitance arc when the concentration of HCO-3 is 1、5 and 84 g/L.The rate of cathodic reaction increases with the increase of the concentration of HCO-3.When polarization potential is about -0.9 V there is an abruptly change of polarization current.
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