Jalab Rem, Ali Ahmed Ben, Khaled Mazen, Abouseada Maha, AlKhalil Safa, Al-Suwaidi Amna, Hamze Sali, Hussein Ibnelwaleed A
Gas Processing Center, College of Engineering, Qatar University, PO Box 2713, Doha 974, Qatar.
Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, PO Box 2713, Doha 974, Qatar.
ACS Omega. 2023 May 2;8(19):16673-16686. doi: 10.1021/acsomega.2c07607. eCollection 2023 May 16.
Utilizing green corrosion inhibitors has been classified among the most efficient and economical mitigation practices against metallic degradation and failure. This study aims to integrate the features of green and complementary properties of polyepoxysuccinic acid (PESA) and polyacrylamide (PAM) for steel corrosion inhibition. A novel PESA-grafted-PAM (PESAPAM) has been first-ever synthesized in this research study and deployed as a corrosion inhibitor for C-steel in 1.0 M HCl solution. Eco-toxicity prediction confirmed the environmentally friendly properties acquired by the synthesized inhibitor. Electrochemical, kinetics, and surface microscopic studies were carried out to gain a holistic view of C-steel corrosion behavior with the PESAPAM. Furthermore, the performance of PESAPAM was compared with that of the pure PESA under the same testing conditions. Results revealed predominant inhibitive properties of PESAPAM with an inhibition efficiency (IE) reaching 90% at 500 mg·L at 25 °C. Grafting PAM onto the PESA chain showed an overall performance improvement of 109% from IE% of 43 to 90%. Electrochemical measurements revealed a charge transfer-controlled corrosion mechanism and the formation of a thick double layer on the steel surface. The potentiodynamic study classified PESAPAM as a mixed-type inhibitor. Furthermore, the investigation of C-steel corrosion kinetics with the presence of PESAPAM predicted an activation energy of 85 kJ·mol, correlated with a physical adsorption behavior. Finally, performed scanning electron microscopy and energy-dispersive X-ray analyses confirmed the adsorption of PESA and PESAPAM, with superior coverage of PESAPAM onto the steel surface.
使用绿色缓蚀剂已被归类为防止金属降解和失效的最有效且经济的缓解措施之一。本研究旨在整合聚环氧琥珀酸（PESA）和聚丙烯酰胺（PAM）的绿色特性及互补性能，以抑制钢铁腐蚀。在本研究中首次合成了一种新型的PESA接枝PAM（PESAPAM），并将其用作1.0 M HCl溶液中碳钢的缓蚀剂。生态毒性预测证实了合成缓蚀剂具有环境友好特性。进行了电化学、动力学和表面显微镜研究，以全面了解PESAPAM作用下碳钢的腐蚀行为。此外，在相同测试条件下，将PESAPAM的性能与纯PESA的性能进行了比较。结果表明，PESAPAM具有显著的缓蚀性能，在25℃下500 mg·L时缓蚀效率（IE）达到90%。将PAM接枝到PESA链上使整体性能提高了109%，缓蚀效率从43%提高到90%。电化学测量揭示了电荷转移控制的腐蚀机制以及在钢表面形成厚双电层。动电位研究将PESAPAM归类为混合型缓蚀剂。此外，对存在PESAPAM时碳钢腐蚀动力学的研究预测其活化能为85 kJ·mol，这与物理吸附行为相关。最后，进行的扫描电子显微镜和能量色散X射线分析证实了PESA和PESAPAM的吸附，PESAPAM在钢表面的覆盖效果更佳。
