The electrochemical corrosion parameters, such as corrosion potential, corrosion current density, and the Tafel constants are necessary inputs for the corrosion modeling in reinforced concrete. Literature shows large variability in their values, whereas the data are scarce for the carbonated concrete. This paper presents a range of corrosion parameters for the active steel in carbonated and the passive steel in noncarbonated concrete. Forty-eight singly reinforced concrete cylinders were cast, of which 24 were carbonated and the others were sound samples. Potentiodynamic polarization curves were obtained at three different scan rates and extrapolated to extract the corrosion parameters. To validate these parameters, a macrocell corrosion system was simulated using FEM-based Comsol multiphysics® software. The numerical results were compared to two experimental studies. A natural dispersion in the values of corrosion parameters for both active and passive steels was observed. The average Stern–Geary constant was 54 and 47 mV for active and passive steels, respectively. Numerical simulations with the obtained parameters predicted the macrocell corrosion in partially carbonated concrete with a high accuracy. The presented values of corrosion parameters in this study could help researchers and engineers to simulate the corrosion phenomena in concrete accurately.

中文翻译：

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碳酸盐混凝土和完好混凝土中主动和被动钢筋的电化学腐蚀参数

电化学腐蚀参数，如腐蚀电位、腐蚀电流密度和塔菲尔常数，是钢筋混凝土腐蚀建模的必要输入。文献显示它们的值变化很大，而碳酸混凝土的数据很少。本文介绍了碳酸盐混凝土中的活性钢和非碳酸盐混凝土中的被动钢的一系列腐蚀参数。浇筑了 48 个单筋混凝土圆柱体，其中 24 个是碳酸化的，其余为完好的样品。在三种不同的扫描速率下获得动电位极化曲线并外推以提取腐蚀参数。为了验证这些参数，使用基于 FEM 的 Comsol multiphysics® 软件对宏电池腐蚀系统进行了模拟。数值结果与两个实验研究进行了比较。观察到活性钢和钝化钢的腐蚀参数值自然分散。主动钢和被动钢的平均 Stern-Geary 常数分别为 54 和 47 mV。使用获得的参数进行数值模拟以高精度预测部分碳化混凝土中的宏电池腐蚀。本研究中腐蚀参数的呈现值可以帮助研究人员和工程师准确模拟混凝土中的腐蚀现象。使用获得的参数进行数值模拟以高精度预测部分碳化混凝土中的宏电池腐蚀。本研究中腐蚀参数的呈现值可以帮助研究人员和工程师准确模拟混凝土中的腐蚀现象。使用获得的参数进行数值模拟以高精度预测部分碳化混凝土中的宏电池腐蚀。本研究中腐蚀参数的呈现值可以帮助研究人员和工程师准确模拟混凝土中的腐蚀现象。