Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 335, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2021.116552
Keywords
Corrosion; Naphthol derivatives; Surface analyzes; Electrochemical; Quantum chemical
Funding
- National Natural Science Foundation of China [21706195,22062022]
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This study focused on the corrosion inhibition of mild steel in hydrochloric acid medium by new naphthol derivatives based on 8-hydroxyquinoline. Experimental results showed that these inhibitors exhibited high inhibition efficiencies and acted on the steel surface through an adsorption mechanism.
The present investigation focused on the corrosion inhibition of mild steel in 1.0 M HCl medium by new naphthol based on 8-hydroxyquinoline. These products were characterized by H-1-NMRand C-13 NMR spectroscopy. The influence of concentration (C) and temperature (T) on the corrosion process of mild steel before and after addition of naphthol derivatives in corrosive solutions has been investigated through weight loss (WL), electrochemical measurements :electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). PDP findings revealed that the used naphthol derivatives exhibit a mixed character. Inhibition efficiencies of Q-1 and Q-2 followed the order: 87.6% (Q-1) < 90.9% (Q-2). The study has shown that these inhibitors act through adsorption mechanism onto steel surface following Langmuir isotherm. The surface analyzes were carried out by SEM, EDS, AFM, and XRD. The corrosive solutions were analyzed by UV-visible and ICP-OES. Experimental and spectroscopic studies were confirmed using DFT calculations and MD simulations. (C) 2021 Elsevier B.V. All rights reserved.
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