新型环保型酸化缓蚀剂的研究进展:吲哚嗪衍生物的结构与缓蚀作用

Zhen Yang, Yefei Wang, Renzhuo Wang, Wuhua Chen, M. Ding, Fengtao Zhan, Baofeng Hou
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引用次数: 0

摘要

丙炔醇通常作为酸化用缓蚀剂的重要增效成分,价格昂贵且毒性高;然而,在我们最近的工作中,一种新的吲哚嗪衍生物被发现具有有效的保护性能,而不需要丙炔醇的协同作用。以喹啉、吡啶和几种卤化物为原料,经1,3-偶极环加成反应制备了吲哚嗪衍生物。该衍生物可以在极低浓度下防止金属腐蚀,并满足日益严格的环境标准要求。通过失重、动电位极化法(Tafel曲线)和电化学阻抗谱(EIS)研究了吲哚嗪衍生物在15 wt.% HCl和20 wt.% HCl中对N80钢的缓蚀性能。在不含丙炔醇的情况下,当15wt .%盐酸中吲哚嗪衍生物的用量为0.1 wt.%时,90℃下N80钢的缓蚀效率提高到约99%。在较低的浓度下,吲哚嗪衍生物的抗腐蚀性能远优于当前酸化缓蚀剂中常用的氯化苄喹啉(BQC),后者是吲哚嗪衍生物的前体。更重要的是,这些具有保护作用的吲哚嗪化合物比协同抑制剂丙炔醇表现得更好。吲哚嗪衍生物中增强的活性吸附基团可以提供额外的吸附位点,将抑制分子固定在钢表面,从而增强了保护作用。本文提出了一种新的吲哚嗪衍生物,作为一种酸化抑制剂,也可能提供一种低污染的防腐蚀技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Insight of New Eco-Friendly Acidizing Corrosion Inhibitor: Structure and Inhibition of the Indolizine Derivatives
Propargyl alcohol, at great expense and with high toxicity, is often used as an essential synergistic component of corrosion inhibitors for acidizing; however, in our recent work, a novel indolizine derivative was found to exhibit effective protection performance without the synergism of propargyl alcohol. These indolizine derivatives were easily prepared from quinoline, pyridine, and several halide compounds via 1,3-dipolar cycloaddition reaction. The derivative could prohibit the corrosion of metal at an extremely low concentration and fulfills the requirements of increasingly stringent environmental standards. The inhibition performance of the indolizine derivatives to N80 steel was investigated in 15 wt.% HCl and 20 wt.% HCl by weight loss measurements, potentiodynamic polarization method (Tafel curves), and electrochemical impedance spectroscopy (EIS). In the absence of propargyl alcohol, when the dosage of indolizine derivatives in 15 wt.% HCl is 0.1 wt.%, the inhibition efficiency of N80 steel increases to approximately 99% at 90 °C. The indolizine derivative shows a superior anti-corrosion performance at a much lower concentration than that of benzyl quinolinium chloride (BQC, a commonly used compound in current acidizing corrosion inhibitors), which serves as the precursor to indolizine derivatives. More importantly, these protective indolizine compounds behave better than the synergistic inhibitor propargyl alcohol. The reinforced active adsorption groups in indolizine derivatives could provide extra adsorption sites and fasten the inhibitive molecule to the steel surface, thus augmenting the protective effect. Here, a new inhibitive indolizine derivative is presented as an acidizing inhibitor that may also offer a low-pollution technique for corrosion prevention.
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