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Insight into inhibition behavior of novel ionic liquids for magnesium alloy in NaCl solution: experimental and theoretical investigation
Corrosion Science ( IF 8.3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.corsci.2019.108410
Huishuang Su , Li Wang , Yaxu Wu , Yuanmi Zhang , Jinglai Zhang

Abstract Three ionic liquids, decyl triphenyl phosphonium bis(trifluoromethylsulfonyl)amide ([DTP][NTf2]), tetradecyl triphenyl phosphonium bis(trifluoromethylsulfonyl)amide ([TTP][NTf2]), and octadecyl triphenyl phosphonium bis(trifluoromethylsulfonyl)amide ([OTP][NTf2]), are firstly synthesized and their corrosion inhibition for AZ31B magnesium alloys in 0.05 wt.% NaCl solution is measured by electrochemical tests. The surface morphology is determined by scanning electron microscopy (SEM) and atomic force microscopy (AFM), which testifies the formation of protective films on Mg alloy surface. The inhibition mechanism is further elucidated by X-ray photoelectron spectroscopy (XPS), first principle calculation along with molecular dynamics (MD). Possible inhibited mechanism is proposed finally. The highest inhibition efficiency is 91.9% by addition of 0.30 mM [OTP][NTf2] in corrosive media.

中文翻译:

新型离子液体在 NaCl 溶液中对镁合金的抑制行为:实验和理论研究

摘要 三种离子液体,癸基三苯基鏻双(三氟甲基磺酰基)酰胺([DTP][NTf2])、十四烷基三苯基鏻双(三氟甲基磺酰基)酰胺([TTP][NTf2])和十八烷基三苯基鏻双(三氟甲基磺酰基)酰胺([ OTP][NTf2]),首先被合成,并通过电化学测试测量它们在 0.05 wt.% NaCl 溶液中对 AZ31B 镁合金的腐蚀抑制。通过扫描电子显微镜(SEM)和原子力显微镜(AFM)测定表面形貌,证明镁合金表面形成了保护膜。通过 X 射线光电子能谱 (XPS)、第一原理计算以及分子动力学 (MD) 进一步阐明了抑制机制。最后提出了可能的抑制机制。最高抑制效率为91。
更新日期:2020-04-01
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