عنوان مجله
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MATERIALS CHEMISTRY AND PHYSICS
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چکیده
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The weak corrosion resistance of mild steel (MS) is considered a severe problem in many industrial applications.
The application of corrosion inhibitors is suggested to mitigate the corrosion of steel. Within this framework, a
series of novel inhibitors, including 4-ferrocenylbutyl formate, 4-ferrocenylbutyl acrylate, and 4-ferrocenylbutyl
phenylacetate, was synthesized and subsequently characterized using 1H NMR, 13C NMR, and FT-IR spectros-
copies. The corrosion inhibition properties of synthesized components were evaluated for MS in 1 M HCl solution
through electrochemical impedance spectroscopy (EIS), Tafel, Atomic force microscopy (AFM), and scanning
electron microscopy (SEM). SEM images showed the presence of a protective layer on the steel surface in the
presence of inhibitors. This thick layer, visible to the naked eye, is responsible for a significant resistance against
corrosion. EIS data indicated that the inhibition efficiency of 4-ferrocenylbutyl formate (C) increased from 92%
to 94% after 14 days of immersion in 1 M HCl. Furthermore, the results show that the Rct of inhibited MS after 2 h
increased from 57 to 880 Ω cm2 in 4 mM C inhibitor, and it enhanced to 1870 Ω cm2 after 170 h toward the
uninhibited surface. Proposed inhibitors have extraordinary adsorption abilities on the metal surface to increase
corrosion protection, improving this adsorption over time. Besides, the potentiodynamic polarization results
disclosed that steel corrosion protection after two weeks of immersion in the acidic solution containing (C) in-
hibitor was about 20 times higher than the inhibitor-free solution. Synthesized ferrocenylbutyl derivatives can be
utilized for prolonged corrosion inhibition purposes. Furthermore, density functional theory calculations
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