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Palayoor, Vinod Raphael, Kakkassery, Joby Thomas, Kanimangalath, Shaju Shanmughan, Varghese, Sini. (1395). Chemical modification at the surface and corrosion inhibition response of two semicarbazones on carbon steel in HCl medium. نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 8(1), 49-60. doi: https://doi.org/10.1007/s40090-016-0101-0
Vinod Raphael Palayoor; Joby Thomas Kakkassery; Shaju Shanmughan Kanimangalath; Sini Varghese. "Chemical modification at the surface and corrosion inhibition response of two semicarbazones on carbon steel in HCl medium". نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 8, 1, 1395, 49-60. doi: https://doi.org/10.1007/s40090-016-0101-0
Palayoor, Vinod Raphael, Kakkassery, Joby Thomas, Kanimangalath, Shaju Shanmughan, Varghese, Sini. (1395). 'Chemical modification at the surface and corrosion inhibition response of two semicarbazones on carbon steel in HCl medium', نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 8(1), pp. 49-60. doi: https://doi.org/10.1007/s40090-016-0101-0
Palayoor, Vinod Raphael, Kakkassery, Joby Thomas, Kanimangalath, Shaju Shanmughan, Varghese, Sini. Chemical modification at the surface and corrosion inhibition response of two semicarbazones on carbon steel in HCl medium. نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 1395; 8(1): 49-60. doi: https://doi.org/10.1007/s40090-016-0101-0

Chemical modification at the surface and corrosion inhibition response of two semicarbazones on carbon steel in HCl medium

International Journal of Industrial Chemistry
دوره 8، شماره 1، خرداد 2017، صفحه 49-60
نوع مقاله: research article
شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-016-0101-0
نویسندگان
Vinod Raphael Palayoor1؛ Joby Thomas Kakkassery* 2؛ Shaju Shanmughan Kanimangalath1؛ Sini Varghese3
1Department of Chemistry, Government Engineering College, Thrissur, 680009, Kerala, India
2Research Division, Department of Chemistry, St. Thomas’ College (Autonomous), Thrissur, Kerala, 680001, India
3Research Division, Department of Chemistry, St. Thomas’ College (Autonomous), Thrissur, 680001, Kerala, India
چکیده
Two similarly structured heterocyclic semicarbazones (E)-4-(5-((2-carbamoylhydrazano)methyl)furan-2-yl)benzoic acid (CPFASC) and (E)-2-((5-(4-nitrophenyl)furan-2-yl)methylene)hydrazinecarboxamide (NPFASC) were synthesized, characterized and tested for their corrosion protection capacity on carbon steel (CS) in 1 M HCl solution. Contrary to expectation the non-planar molecule NPFASC showed better inhibition efficiency on CS surface than CPFASC. At a concentration of 0.5 mM, NPFASC displayed 93.4 % while CPFASC showed 89.9 % inhibition efficiency according to impedance studies. This unusual behavior can be explained by the conversion of the nitro group present in the NPFASC molecule into amino group on approaching the metal surface in the corrosive medium. This transformation obviously changes the geometry of the molecule which is more conducive for corrosion inhibition. Analysis of the corrosion product deposited on the surface of the metal revealed the mechanism behind the inhibitive power of molecules. Adsorption studies showed that CPFASC and NPFASC follow Freundlich and El-Awady isotherms, respectively, on the carbon steel surface. Adsorption equilibrium constant and free energy of adsorption were also evaluated. The corrosion investigations were done by gravimetric, EIS and polarization studies and the surface analysis of the metal specimens was performed by SEM, AFM and IR spectral spectroscopy.
کلیدواژه‌ها
Inhibitor؛ EIS؛ Polarization؛ Freundlich؛ El-Awady
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تعداد مشاهده مقاله: 14


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