Relationship Between Pitting Potential of Carbon Steel with Ratio of HCO3 - /Cl - in Alkaline Solution
2016
研究了Na HCO3+Na Cl碱性溶液中,较宽Cl^-浓度(0.001-0.3 mol/L)范围内Cl^-浓度及HCO3^-和Cl^-的浓度比值([HCO3^-]/[Cl^-])对Q235碳钢小孔腐蚀电位的影响。结果表明,Cl^-浓度较大(〉0.02 mol/L)时,碳钢的稳定孔蚀电位Eb和亚稳态孔蚀电位Em都与[HCO3^-]/[Cl^-]符合很好的线性关系,[HCO3^-]/[Cl^-]升高Eb和Em线性增大;当Cl^-浓度较小(〈0.02 mol/L)时,Eb和Em与[HCO3^-]/[Cl^-]之间不存在良好的线性关系,该条件下碳钢表面在发生稳定孔蚀前观察不到微米级的亚稳态小孔。
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