Abstract The corrosion inhibition of a combination of Na2HPO4 (DSP) and benzotriazole (BTA) for rebar in carbonated concrete pore solutions was investigated. Electrochemical methods were adopted to assess the corrosion behaviour of rebar thermodynamically and kinetically. Also, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to detect the composition of oxide films formed on the rebar surface and the surface morphology of rebar, respectively. Results show that there exists an optimum proportion of DSP and BTA to execute the highest corrosion inhibition efficiency. The mixture of DSP and BTA acts as a mixed-type inhibitor, in which DSP behaves as the cathodic inhibitor and BTA acts as the anodic inhibitor. The adsorption of BTA obeys Langmuir adsorption isotherm. High content of BTA could compete with DSP, which leads to low inhibition efficiency.

中文翻译：

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Na2HPO4 和苯并三唑增强钢筋在碳酸混凝土孔隙溶液中的耐腐蚀性能

摘要 研究了 Na2HPO4 (DSP) 和苯并三唑 (BTA) 组合对钢筋在碳酸混凝土孔隙溶液中的缓蚀作用。采用电化学方法从热力学和动力学上评估钢筋的腐蚀行为。此外，X射线光电子能谱（XPS）和扫描电子显微镜（SEM）分别用于检测钢筋表面形成的氧化膜成分和钢筋表面形貌。结果表明，存在最佳比例的DSP和BTA以实现最高的缓蚀效率。DSP和BTA的混合物作为混合型抑制剂，其中DSP作为阴极抑制剂，BTA作为阳极抑制剂。BTA的吸附服从Langmuir吸附等温线。高含量的BTA可与DSP竞争，