1-Benzyl-3-phenyl-2-thiourea (BPTU) was studied as a steel corrosion inhibitor in 1.0 M HCl solution. Experimental methods were conducted including potentiodynamic polarization measurement (PPM), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) analysis. Quantum calculations were performed at B3LYP/6-311G(d,p). Hexamethylenetetramine (URO) was selected for comparison with BPTU. The results showed that BPTU with the concentration of 2 × 10⁻⁴ M and at the temperature of 30°C could protect the steel surface with the highest inhibition efficiency of 94.99% and 94.30% according to EIS and PPM, respectively. High temperature decreased BPTU’s ability to inhibit the steel corrosion. The adsorption of BPTU on the steel surface is followed by the modified Langmuir isotherm. Quantum chemical calculations showed that the thiourea functional group is the main adsorption center of BPTU. The experimental results are completely consistent with theoretical calculations.

中文翻译：

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1-苄基-3-苯基-2-硫脲在1.0 M HCl溶液中作为有效的钢缓蚀剂的研究

研究了1-苄基-3-苯基-2-硫脲（BPTU）作为1.0 M HCl溶液中的钢腐蚀抑制剂。实验方法包括电位动力学极化测量（PPM），电化学阻抗谱（EIS）和扫描电子显微镜（SEM）分析。量子计算在B3LYP / 6-311G（d，p）进行。选择六亚甲基四胺（URO）与BPTU进行比较。结果表明BPTU的浓度为2×10 ^-4 根据EIS和PPM，M和在30°C的温度下可分别以94.99％和94.30％的最高抑制效率保护钢表面。高温降低了BPTU抑制钢腐蚀的能力。BPTU在钢表面的吸附之后是改进的Langmuir等温线。量子化学计算表明，硫脲官能团是BPTU的主要吸附中心。实验结果与理论计算完全一致。