Mubarak Ghadeer, Verma Chandrabhan, Jafar Mazumder Mohammad A, Barsoum Imad, Alfantazi Akram
Department of Petroleum and Chemical Engineering, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates.
Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran, Saudia Arabia.
PLoS One. 2025 Jun 18;20(6):e0320981. doi: 10.1371/journal.pone.0320981. eCollection 2025.
By encouraging improved adsorption onto metal surfaces and creating a more powerful barrier against corrosive chemicals, the hydrophobic property of corrosion inhibitors raises inhibition efficiency and decreases corrosion rates. This work aims to synthesize and describe three quaternary ammonium-based copolymers (AMCs) with different hydrophobic qualities and investigate their ability to inhibit P110 CS corrosion in 15% HCl, which is helpful for casing and tubing. The results showed that AMCs act as efficient corrosion inhibitors, with over 90% inhibition efficiency ([Formula: see text] ) at 20 ppm concentration. The electrochemical investigation results indicated that the AMCs with hydrophilic and hydrophobic ratios of 100 (5), 90:10 (6a), and 80:20 (6b) manifest [Formula: see text] of 87.74%, 92.12%, and 93.53%, respectively. The electrochemical investigations show that at the metallic surface's active areas, AMCs successfully replace the pre-adsorbed water molecules. They are categorized as mixed-type corrosion inhibitors because they prevent both anodic and cathodic reactions without appreciably changing the corrosion potential ([Formula: see text]). Their adsorption on the metallic surface follows the Langmuir adsorption isotherm. Surface analysis tools like SEM and EDX are utilized to investigate the corrosion prevention mechanism of adsorption. The DFT analysis results show that quaternary nitrogen atoms of hydrophilic and hydrophobic moieties play a key role in the adsorption and charge-sharing processes. Finally, the corrosion prevention mechanism of AMCs is explained using a graphic depiction based on the ideas of electrochemical, surface, and computational studies.
通过促进在金属表面的吸附改善，并形成更强大的抗腐蚀化学物质屏障，缓蚀剂的疏水特性提高了缓蚀效率并降低了腐蚀速率。本工作旨在合成并描述三种具有不同疏水性质的季铵基共聚物（AMCs），并研究它们在15%盐酸中抑制P110 CS腐蚀的能力，这对套管和油管是有帮助的。结果表明，AMCs作为高效缓蚀剂，在20 ppm浓度下具有超过90%的缓蚀效率（[公式：见原文]）。电化学研究结果表明，亲水与疏水比例为100 (5)、90:10 (6a) 和80:20 (6b) 的AMCs的[公式：见原文]分别为87.74%、92.12%和93.53%。电化学研究表明，在金属表面的活性区域，AMCs成功取代了预先吸附的水分子。它们被归类为混合型缓蚀剂，因为它们能同时阻止阳极和阴极反应，而不会明显改变腐蚀电位（[公式：见原文]）。它们在金属表面的吸附遵循朗缪尔吸附等温线。利用扫描电子显微镜（SEM）和能谱仪（EDX）等表面分析工具来研究吸附的防腐蚀机理。密度泛函理论（DFT）分析结果表明，亲水和疏水部分的季氮原子在吸附和电荷共享过程中起关键作用。最后，基于电化学、表面和计算研究的思路，用图形描述解释了AMCs的防腐蚀机理。
