Subbiah Karthick, Lee Han-Seung, Al-Hadeethi Mustafa R, Park Taejoon, Lgaz Hassane
Department of Architectural Engineering, Hanyang University-ERICA, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, Gyeonggi-do 15588, Republic of Korea.
Department of Architectural Engineering, Hanyang University-ERICA, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, Gyeonggi-do 15588, Republic of Korea.
J Adv Res. 2024 Apr;58:211-228. doi: 10.1016/j.jare.2023.08.016. Epub 2023 Aug 25.
Corrosion-induced deterioration of infrastructure is a growing global concern. The development and application of corrosion inhibitors are one of the most effective approaches to protect steel rebar from corrosion. Hence, this study focuses on a novel hydrazone derivative, (E)-N'-(4-(dimethylamino)benzylidene)-2-(5-methoxy-2-methyl-1H-indol-3-yl)aceto-hydrazide (HIND), and its potential application to mitigate corrosion in steel rebar exposed to chloride-contaminated concrete pore solutions (ClSCPS).
The research aims to evaluate the anti-corrosion capabilities of HIND on steel rebar within a simulated corrosive environment, focusing on the mechanisms of its inhibitory effect.
The corrosion of steel rebar exposed to the ClSCPS was studied through weight loss and electrochemical methods. The surface morphology of steel rebar surface was characterized by FE-SEM-EDS, AFM; oxidation states of the steel rebar and crystal structures were examined using X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) methods. Further, experimental findings were complemented by theoretical studies using self-consistent-charge density-functional tight-binding (SCC-DFTB) simulations. The performance of HIND was monitored at an optimal concentration over a period of 30 days.
The results indicated a significant reduction in steel rebar corrosion upon introducing HIND. The inhibitor molecules adhered to the steel surface, preventing further deterioration and achieving an inhibition efficiency of 88.4% at 0.5 mmol/L concentration. The surface morphology analysis confirmed the positive effect of HIND on the rebar surface, showing a decrease in the surface roughness of the steel rebar from 183.5 in uninhibited to 50 nm in inhibited solutions. Furthermore, SCC-DFTB simulations revealed the presence of coordination between iron atoms and HIND active sites.
The findings demonstrate the potential of HIND as an effective anti-corrosion agent in chloride-contaminated environments. Its primary adsorption mechanism involves charge transfer from the inhibitor molecules to iron atoms. Therefore, applying HIND could be an effective strategy to address corrosion-related challenges in reinforced infrastructure.
基础设施因腐蚀而恶化是一个日益引起全球关注的问题。缓蚀剂的开发和应用是保护钢筋免受腐蚀的最有效方法之一。因此，本研究聚焦于一种新型腙衍生物，（E）-N'-（4-（二甲基氨基）亚苄基）-2-（5-甲氧基-2-甲基-1H-吲哚-3-基）乙酰肼（HIND），及其在减轻暴露于氯化物污染混凝土孔隙溶液（ClSCPS）中的钢筋腐蚀方面的潜在应用。
本研究旨在评估HIND在模拟腐蚀环境中对钢筋的防腐能力，重点关注其抑制作用机制。
通过失重法和电化学方法研究了暴露于ClSCPS中的钢筋腐蚀情况。采用场发射扫描电子显微镜-能谱仪（FE-SEM-EDS）、原子力显微镜（AFM）对钢筋表面形貌进行表征；利用X射线光电子能谱（XPS）和X射线衍射（XRD）方法检测钢筋的氧化态和晶体结构。此外，通过自洽电荷密度泛函紧束缚（SCC-DFTB）模拟进行理论研究，对实验结果进行补充。在30天的时间内，在最佳浓度下监测HIND的性能。
结果表明，引入HIND后钢筋腐蚀显著减少。抑制剂分子附着在钢表面，防止进一步恶化，在0.5 mmol/L浓度下缓蚀效率达到88.4%。表面形貌分析证实了HIND对钢筋表面的积极影响，显示钢筋表面粗糙度从未加抑制剂时的183.5降低到加抑制剂溶液中的50 nm。此外，SCC-DFTB模拟揭示了铁原子与HIND活性位点之间存在配位作用。
研究结果表明HIND在氯化物污染环境中作为一种有效的防腐剂具有潜力。其主要吸附机制涉及抑制剂分子向铁原子的电荷转移。因此，应用HIND可能是解决钢筋基础设施中与腐蚀相关挑战的有效策略。
