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Studies on a Few Substituted Piperidin-4-one Oximes as Corrosion Inhibitor for Mild Steel in HCl

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Abstract

The corrosion inhibition of mild steel in 1 M hydrochloric acid by a few piperidin-4-one oxime derivatives, namely, 1,3-dimethyl-2,6-diphenyl piperidin-4-one oxime (I), 3,3-dimethyl-2,6-diphenyl piperidin-4-one oxime (II), and 3-isopropyl-2,6-diphenyl piperidin-4-one oxime (III) was studied using chemical weight loss method, electrochemical polarization and impedance spectroscopy, SEM with EDS, XRD, FT-IR measurements, and semi-empirical AM1 method for electronic properties. The weight loss measurements at four different temperatures such as 30, 40, 50, and 60 °C showed that the percentage inhibition efficiency (IE) of these compounds increased with increase of concentration and decreased with increase of temperature. The IE followed the order III < II < I. It was found that these inhibitors function through physical adsorption mechanism obeying Temkin’s isotherm. Polarization studies showed that these compounds act as mixed-type inhibitors. Impedance measurements revealed the increase of charge transfer resistance with inhibitor concentration. Surface analysis using SEM, XRD, and FT-IR revealed the formation of protective film over the mild steel surface. The electronic properties calculated using AM1 semi-empirical method explained the inhibition characteristics. The quantum chemical studies showed that ring nitrogen and phenyl rings are the probable active centers to inhibit corrosion process.

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Acknowledgments

The authors thank the authorities of Gandhigram Rural University for their help and encouragement. The authors acknowledge the help received from Dr. Vijayalakshmi, Dr. Parameswaran, and Ms. Radhika, PMD Division, IGCAR, Kalpakkam and for the permission to use the instrumental facilities. Authors (ANS and KT) thank the authorities of SASTRA University, Thanjavur for the support.

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Correspondence to M. G. Sethuraman.

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Senthilkumar, A.N., Tharini, K. & Sethuraman, M.G. Studies on a Few Substituted Piperidin-4-one Oximes as Corrosion Inhibitor for Mild Steel in HCl. J. of Materi Eng and Perform 20, 969–977 (2011). https://doi.org/10.1007/s11665-010-9719-9

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  • DOI: https://doi.org/10.1007/s11665-010-9719-9

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