The pitting corrosion behavior of HRB400 steel in various simulated concrete environments was investigated by the combination of polarization curves and statistical method. The results indicated that the chloride concentration threshold ([Cl⁻]_th) for pitting of the steel was greatly affected by pH when the applied potential exists, which is always caused by random stray current. The interaction of applied potential and chloride concentration on the pitting behavior was discussed. Finally, pitting-risk-evaluation diagrams were built up, which could be easily used to assess the pitting risk of reinforcing bars under the chloride-containing environment with stray current.

中文翻译：

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应用电势下模拟混凝土孔隙溶液中氯离子阈值和钢筋腐蚀风险评估的研究

结合极化曲线和统计方法，研究了HRB400钢在各种模拟混凝土环境中的点蚀行为。结果表明，氯化物的浓度阈值（[氯^- ]_次）为钢的点蚀在很大程度上受到pH的影响，当所施加的电位存在，这总是由随机杂散电流引起的。讨论了施加电位和氯化物浓度对点蚀行为的相互作用。最后，建立了点蚀风险评估图，可以很容易地用来评估杂散电流下含氯环境下钢筋的点蚀风险。