The inhibition effect of (2-(3-Bromophenyl)-1-phenyl-1H-benzimidazole, BPB) was investigated for inhibiting copper corrosion in 0.5 mol L H2SO4 solution, compared with traditional corrosion inhibitor benzimidazole (BIM). Various methods were used including electrochemical methods, scanning electron microscope (SEM), Langmuir type adsorption isotherm, quantum chemical calculation, and molecular dynamics simulation. We found that BPB belongs to a mixed type inhibitor. The adsorption of BPB on Cu conforms to a Langmuir adsorption isotherm. The maximum efficiencies of 70.1% for BIM was improved to 97.0% at 5 mmol L. SEM confirms the electrochemical results. Molecular chemical calculation further reveals the inhibition mechanism of BPB at microscopic level and explain its greater inhibition ability than BIM.

中文翻译：

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2-（3-溴苯基）-1-苯基-1H-苯并咪唑对酸性溶液中铜腐蚀的抑制作用及其机理

与传统的腐蚀抑制剂苯并咪唑（BIM）相比，研究了（2-（3-溴苯基）-1-苯基-1H-苯并咪唑，BPB）对0.5 mol L H2SO4溶液中铜腐蚀的抑制作用。使用了各种方法，包括电化学方法，扫描电子显微镜（SEM），Langmuir型吸附等温线，量子化学计算和分子动力学模拟。我们发现BPB属于混合型抑制剂。BPB在Cu上的吸附符合Langmuir吸附等温线。在5 mmol L下，BIM的最大效率从70.1％提高到97.0％。SEM证实了电化学结果。分子化学计算进一步揭示了BPB的抑制机理，并解释了其比BIM更大的抑制能力。