Abstract—

Novel anionic 4-tert-Octylphenol Ethoxylated Phosphate Dipotassium salt (ethoxylated with 5 moles of ethylene oxide) surfactant was prepared and designated as OP-5-EO-K₂PO, was characterized for its structure using spectroscopic measurements, in addition, its surface properties were investigated. The results indicated that OP-5-EO-K₂PO exhibits excellent surface activity. Evaluation of the prepared surfactant as a corrosion inhibitor was carried out. The inhibition effect of OP-5-EO-K₂PO surfactant, on the corrosion of C-steel in 0.5 M HCl was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. It was found that the novel anionic surfactant acts as effective inhibitor and its inhibition efficiency was significantly increased with increasing concentration. Polarization curves revealed that the novel prepared anionic surfactant represents mixed-type inhibitors. Adsorption of the investigated surfactant led to a reduction in the double layer capacitance and an increase in the charge transfer resistance.

中文翻译：

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新型4-叔丁基苯酚乙氧基化磷酸酯阴离子表面活性剂在酸性介质中对C钢的腐蚀抑制剂

摘要—

制备了新型的4-叔-辛基酚乙氧基化磷酸双钾盐阴离子（用5摩尔环氧乙烷乙氧基化）表面活性剂，命名为OP-5-EO-K ₂ PO，使用分光光度法对其结构进行了表征，此外，还对其表面进行了表征性能进行了调查。结果表明，OP-5-EO-K ₂ PO具有优异的表面活性。对制备的表面活性剂作为腐蚀抑制剂进行评价。OP-5-EO-K ₂的抑制作用通过电位动力学极化，电化学阻抗谱（EIS）和电化学频率调制（EFM）技术研究了PO表面活性剂在0.5 M HCl中对C钢的腐蚀。发现该新型阴离子表面活性剂可作为有效的抑制剂，并且其抑制效率随着浓度的增加而显着提高。极化曲线表明，新型制备的阴离子表面活性剂代表混合型抑制剂。所研究的表面活性剂的吸附导致双层电容的减小和电荷转移电阻的增大。