Two novel pyran-2-one derivatives, namely (E)-4-hydroxy-6-methyl-3-(1-(phenylimino) ethyl)-2H-pyran-2-one (Py1) and (E)-3-(1-((2-chlorophenyl)imino)ethyl)-4-hydroxy-6-methyl-2H-pyran-2-one (Py2) were evaluated for corrosion inhibition performance on mild steel (MS) in 1M HCl via potentiodynamic polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS). The experimental results show that the inhibition increases with the concentration and can reach a limit value of 90.0% for the inhibitor Py1 at 10⁻³ M. The polarization curves offer that the pyran-2-one derivatives (Py1 and Py2) are of mixed type. The increase in temperature may have a decrease in the inhibition efficacy of the compounds studied. In addition, the thermodynamic studies show that the inhibitors adsorbed on the surface with chemical bonds (chemisorption) and according to the Langmuir isotherm, the DFT calculations show a good fit to the experimental data.

两个新颖的吡喃-2-酮衍生物，即（E）-4-羟基-6-甲基-3-（1-（苯基亚氨基）乙基）-2H-吡喃-2-酮（Py1）和（E）-3-通过电位极化对（1-（（2-氯苯基）亚氨基）乙基）-4-羟基-6-甲基-2H-吡喃-2-酮（Py2）在1M HCl中对低碳钢（MS）的缓蚀性能进行了评估（PDP）和电化学阻抗谱（EIS）。实验结果表明，在10 ^-3  M时，抑制剂Py1的抑制作用随浓度的增加而增加，可以达到90.0％的极限值。极化曲线表明吡喃-2-酮衍生物（Py1和Py2）为混合类型。温度升高可能会降低所研究化合物的抑制效力。此外，热力学研究表明，抑制剂以化学键（化学吸附）吸附在表面上，根据Langmuir等温线，DFT计算结果与实验数据非常吻合。