Almond gum (AG) was studied as an economically and environmentally viable corrosion inhibitor in 1 M HCl on mild steel (MS). Studies such as gravimetric, NMR, FTIR, EIS, PDP, SEM/EDAX, UV–Visible, DFT and Monte Carlo simulation were performed to assess the potency of AG as a green inhibitor. Gravimetric study was done in the temperature range 30°C–60 °C, I.E increased with increasing concentration and temperature giving significant inhibition efficiency (I.E) of 96.37% at 300 ppm at 60 °C.The adsorption of AG on MS followed Langmuir Adsorption Isotherm. Characterization by NMR and FTIR confirmed the structure of AG. UV–Visible study confirmed the existence of complex [Fe⁺²-AG] on inhibited MS surface. While in 1 M HCl in the presence of AG, MS showed a reduced surface roughness and better surface morphology. Obtained PDP measurements show that AG acts as a mixed type inhibitor but showing predominantly anodic effect while EIS results unveiled the formation of inhibitive layer on the MS surface. I.E calculated from the EIS, PDP showed the same trend as gravimetric. Calculated thermodynamic and activation parameters predicted strong interaction between MS surface and inhibitor. Density functional theory (DFT), condensed Fukui indices (FIs) and Monte Carlo (MC) simulation results further supported the experimental findings.

杏仁胶（AG）在低碳钢（MS）上的1 M HCl中作为经济和环境上可行的腐蚀抑制剂进行了研究。进行了重量分析，NMR，FTIR，EIS，PDP，SEM / EDAX，UV-Visible，DFT和Monte Carlo模拟等研究，以评估AG作为绿色抑制剂的效力。重量分析是在30°C–60°C的温度范围内进行的，IE随着浓度和温度的升高而增加，从而在60°C时300 ppm时具有显着的抑制效率（IE）96.37％。AG在MS上的吸附遵循Langmuir吸附等温线。通过NMR和FTIR的表征证实了AG的结构。紫外可见研究证实了复合物[Fe ⁺²-AG]在受抑制的MS表面上。在存在AG的1 M HCl中，MS表现出降低的表面粗糙度和更好的表面形态。获得的PDP测量结果表明AG充当混合型抑制剂，但主要表现出阳极效应，而EIS结果揭示了MS表面上形成抑制层。根据EIS，PDP计算出的IE表现出与重量法相同的趋势。计算的热力学和活化参数预测了MS表面和抑制剂之间的强相互作用。密度泛函理论（DFT），凝聚态福井指数（FIs）和蒙特卡洛（MC）仿真结果进一步支持了实验结果。