Abstract A new Mannich base; 2-((4-(2-hydroxy-4-methylbenzyl)piperazin-1-yl)methyl)-5-methylphenol (HMP) was synthesized, characterized by elemental analysis, UV/Vis, 1H and 13C NMR spectroscopy, and examined as an inhibitor for the corrosion of a mild steel surface in 0.2 M sulphuric acid (H2SO4) solution using weight loss and potentiodynamic polarization techniques. The X-ray structure of the Mannich base was also reported. The inhibition efficiency increases with increasing inhibitor concentration and decreases over 96 h. Potentiodynamic polarization measurements showed that the inhibitor is of mixed type. The relationship between the molecular structure of HMP and its inhibitory properties was studied using density functional theory (DFT) calculations.

中文翻译：

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2-((4-(2-hydroxy-4-methylbenzyl)piperazin-1-yl)methyl)-5-methylphenol – 曼尼希碱的缓蚀合成、晶体结构、实验和理论研究

摘要 一个新的曼尼希基地；合成了2-((4-(2-hydroxy-4-methylbenzyl)piperazin-1-yl)methyl)-5-甲基苯酚(HMP)，通过元素分析、UV/Vis、1H和13C NMR光谱表征，并检验作为使用失重和动电位极化技术在 0.2 M 硫酸 (H2SO4) 溶液中腐蚀低碳钢表面的抑制剂。还报道了曼尼希碱的 X 射线结构。抑制效率随着抑制剂浓度的增加而增加，并在 96 小时后下降。动电位极化测量表明抑制剂是混合型的。使用密度泛函理论 (DFT) 计算研究了 HMP 的分子结构与其抑制特性之间的关系。