以往少有采用循环伏安(CV)法研究碳钢在乙醇胺CO2饱和溶液中的腐蚀行为.采用Tafel极化曲线、循环伏安法(CV)研究了Q235B碳钢在含缓蚀剂(NaVO3和CuCO3)的CO2饱和乙醇胺(MEA)溶液中的电化学腐蚀行为.Tafel结果表明:NaVO3和CuCO3能抑制碳钢腐蚀,当浓度为500 mg/L时,两者的缓蚀率分别为61.3％和74.2％.CV曲线结果表明:在MEA-CO2溶液中,铁的阳极过程包括铁溶解为Fe2+和Fe3+2个过程.CuCO3和NaVO3的加入抑制了铁的溶解反应,其原因在于它们的加入导致溶液的pH值升高和CO32-浓度增大,生成了更多的FeCO3和Fe2O3钝化膜;此外CuCO3本身引入了CO32-,在相同浓度下CuCO3的缓蚀效果更优.
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