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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HCO3-对J55钢在1%NaCl溶液中的腐蚀行为的影响.结果表明,HCO3-浓度越大阳极反应速率越小.当HCO3-浓度高于0.060 mol/L时HCO3-呈现出钝化特征.随着NaCl溶液中HCO3-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8.4g/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HCO3-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.
The effect of HCO3- on the corrosion behavior of J55 steel in 1% NaCl solution was investigated by potentiodynamic polarization curve, scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The results showed that the larger the HCO3- concentration, the larger the anode reaction HCO3- exhibits passivation characteristics when HCO3- concentration is higher than 0.060 mol / L. With the increase of HCO3- content in NaCl solution, Rt increases and the corrosion rate decreases.J55 steel is treated with NaHCO 3 374 Induced by the electrochemical impedance spectroscopy of the corrosion in a solution of 10 mg / L, the Warburg impedance appears in the electrochemical impedance spectroscopy of corrosion in a solution containing NaHCO3 at 30 g / L, The electrochemical impedance spectroscopy (EIS) of corrosion solution in g / L showed only single capacitive arc characteristics.With the increase of HCO3- concentration, the cathode reaction rate was increasing.The polarization potential was around -0.9 V, with the polarization potential The increase in polarization current has seen a sudden increase.