Cross-linked poly (N-alkyl-4-vinylpyridinium) iodides abbreviated as P₄-VPMI, P₄-VPOI and P₄-VPDI, were synthesized from quaternization of poly(4-vinyl pyridine) cross-linked with 2% DVB, by three alkyl iodides [methyl iodide (MI), octan iodide (OI) and decan iodide (DI)] in acetonitrile at room temperature. Then, their effect as new eco-friendly polymeric inhibitors was investigated in the corrosion process of St-37 in 1 M H₂SO₄. Formation of the inhibitors was approved by energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FT-IR) techniques. Furthermore, their inhibition performance was studied using weight loss measurements, potentiodynamic polarization (tafel), and electrochemical impedance spectroscopy (EIS). By comparison of the inhibitive behavior of three inhibitors using mentioned methods and according to the obtained results, it was clearly found that, by adding all inhibitors into the corrosive solution (1 M H₂SO₄) and also with increasing of the inhibitors concentration, the steel corrosion is greatly reduced. The results also showed that, inhibition efficiency (%E) was decreased by increasing the length of carbon chain of the alkyl group. Therefore among the three inhibitors, P₄VPMI with a concentration of 0.04 g l⁻¹ has the best inhibition effect on the corrosion of St-37. Furthermore, the value of \(\Delta G^{0}\) is found to be − 30.75 kJ mol⁻¹; probably means that the adsorption of the inhibitors on St-37 surface involves both physical and chemical adsorption.

中文翻译：

---

交联聚N-烷基-4-乙烯基吡啶鎓碘化物作为新型环保抑制剂，用于St-37钢在1 MH 2 SO 4中的腐蚀研究

由与2％DVB交联的聚（4-乙烯基吡啶）季铵化反应合成了缩写为P ₄ -VPMI，P ₄ -VPOI和P ₄ -VPDI的交联聚（N-烷基-4-乙烯基吡啶）碘化物。在室温下，由三种烷基碘[甲基碘（MI），辛烷碘（OI）和癸碘化物（DI）]组成。然后，研究了它们作为新型环保聚合物抑制剂在St-37在1 MH ₂ SO ₄中的腐蚀过程中的作用。。抑制剂的形成已通过能量色散X射线光谱法（EDS）和傅里叶变换红外光谱法（FT-IR）批准。此外，使用重量损失测量，电位动力学极化（tafel）和电化学阻抗谱（EIS）研究了它们的抑制性能。通过使用上述方法比较三种抑制剂的抑制行为并根据获得的结果，可以清楚地发现，通过将所有抑制剂添加到腐蚀性溶液（1 MH ₂ SO ₄）中，并且随着抑制剂浓度的增加，钢的腐蚀大大减少。结果还表明，抑制效率（％E通过增加烷基的碳链长度来减少）。因此，在三种抑制剂中，浓度为0.04 g l ^-1的P ₄ VPMI对St-37的腐蚀具有最佳的抑制作用。此外，发现\（\ Delta G ^ {0} \）的值为− 30.75 kJ mol ^-1；这可能意味着抑制剂在St-37表面的吸附涉及物理和化学吸附。