CORROSION INHIBITION BEHAVIOR OF BENZOTHIAZINE DERIVATIVE ON LOW CARBON STEEL IN ACID MEDIUM: ADSORPTION AND QUANTUM CHEMICAL INVESTIGATIONS

Venkatesan Hemapriya, Ill-Min Chung, Kandasamy Parameswari, Subramanian Chitra, Seung-Hyun Kim and Mayakrishnan Prabakaran ()
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Venkatesan Hemapriya: Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore-641 004, Tamil Nadu, India
Ill-Min Chung: #x2020;Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul 05029, South Korea
Kandasamy Parameswari: Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore-641 004, Tamil Nadu, India
Subramanian Chitra: Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore-641 004, Tamil Nadu, India
Seung-Hyun Kim: #x2020;Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul 05029, South Korea
Mayakrishnan Prabakaran: #x2020;Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul 05029, South Korea

Surface Review and Letters (SRL), 2019, vol. 26, issue 10, 1-11

Abstract: The inhibitive performance of 2-[(5-phenyl-1,3,4-oxdiazol-2-yl)methyl]-2H-benzo[b] [1,4] thiazin-3-one (POBT) for low carbon steel corrosion in 1 M H2SO4 has been evaluated by non-electrochrmical, and electrochemical measurements. Efficiency of the inhibitor enhanced with inhibitor concentration and declined with rise in temperature. 92.39% inhibition efficiency was attained using 0.1mM of POBT. Anticorrosive effect of the inhibitor is owing to the adsorption of POBT molecules on the metal surface. Mono layer adsorption of inhibitor was favored by observing the best fit with Langmuir isotherm. Polarization measurements reveal that the inhibitor behaves as mixed type. Surface analysis by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX) confirm the existence of a protective film of POBT on low carbon steel surface. Quantum chemical parameters obtained using density functional theory (DFT) method complements the above results.

Keywords: Benzothiazines; corrosion; Langmuir isotherm; polarization; computational studies (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X19500665

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