Biferrocenyl Schiff bases as efficient corrosion inhibitors for an aluminium alloy in HCl solution

a combined experimental and theoretical study

Document identifier: oai:DiVA.org:ltu-77795
Access full text here:10.1039/C9RA10692H
Keyword: Natural Sciences, Chemical Sciences, Naturvetenskap, Kemi, Physical Chemistry, Fysikalisk kemi, Chemistry of Interfaces, Gränsytors kemi
Publication year: 2020
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Abstract:

The corrosion inhibitive capabilities of some ferrocene-based Schiff bases on aluminium alloy AA2219-T6 in acidic medium were investigated using Tafel polarization, electrochemical impedance spectroscopy (EIS), weight loss measurement, FT-IR spectroscopy and scanning electron microscopic (SEM) techniques. The influence of molecular configuration on the corrosion inhibition behavior has been explored by quantum chemical calculation. Ferrocenyl Schiff bases 4,4′-((((ethane-1,2-diylbis(oxy))bis(4,1-phenylene))bis(methaneylylidene))bis(azaneylylidene))bisferrocene (Fcua), 4,4′-((((ethane-1,2-diylbis(oxy))bis(2-methoxy-1,4-phenylene))bis(methaneylylidene))bis(azaneylylidene))bisferrocene (Fcub) and 4,4′-((((ethane-1,2-diylbis(oxy))bis(2-ethoxy-1,4-phenylene))bis(methaneylylidene))bis(azaneylylidene))bisferrocene (Fcuc) have been synthesized and characterized by FT-IR, 1H and 13C NMR spectroscopic studies. These compounds showed a substantial corrosion inhibition against aluminium alloy in 0.1 M of HCl at 298 K. Fcub and Fcuc showed better anticorrosion efficiency as compared with Fcua due to the electron donating methoxy and ethoxy group substitutions, respectively. Polarization curves also indicated that the studied biferrocenyl Schiff bases were mixed type anticorrosive materials. The inhibition of the aluminium alloy surface by biferrocenyl Schiff bases was evidenced through scanning electron microscopy (SEM) studies. Semi-empirical quantum mechanical studies revealed a correlation between corrosion inhibition efficiency and structural functionalities.

Authors

Uzma Nazir

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Zareen Akhter

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Naveed Kausar Janjua

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Muhammad Adeel Asghar

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Sehrish Kanwal

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Tehmeena Maryum Butt

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Asma Sani

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Faroha Liaqat

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
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Rizwan Hussain

Laboratory for Advanced Materials Processing (LAMP), NCP, Islamabad, Pakistan
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Faiz Ullah Shah

Luleå tekniska universitet; Kemiteknik
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