SYNERGISTIC EFFECT OF HALIDE IONS ON THE CORROSION INHIBITION OF MILD STEEL IN SULPHURIC ACID USING METHYL, N-METHYL ETHYL AND ETHYL SUBSTITUTED γ-2,c-6-DIPHENYL PIPERIDIN-4-ONE SEMICARBAZONES

V. Shanmuga Priya (), C. Uma Rani and S. Velrani
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V. Shanmuga Priya: Department of Chemistry, Government Arts College, Salem, Tamil Nadu, India
C. Uma Rani: Department of Chemistry, Government Arts College, Salem, Tamil Nadu, India
S. Velrani: #x2020;Department of Chemistry, Kamaraj College, Tuticorin, Tamil Nadu, India

Surface Review and Letters (SRL), 2018, vol. 25, issue 02, 1-9

Abstract: The synergistic effect of halide ions such as KCl, KBr and KI on the corrosion inhibition of mild steel in 1 N sulphuric acid by γ-2,c-6-diphenyl-t-3-methyl piperdin-4-ones with semicarbazone (01SC), γ-2,c-6-diphenyl-N-methyl-t-3-ethyl piperdin-4-ones with semicarbazone (02SC) and 2,6-diphenyl-t-3-ethyl piperdin-4-one with semicarbazone (03SC) has been examined by weight loss method, potentiodynamic polarization measurements and electrochemical AC impedance spectroscopy. Results show that substituted γ-2,c-6-diphenyl piperidin-4-ones with semicarbazone act as the perfect corrosion inhibitors and their inhibition efficiency increases with the addition of halide ions. The inhibitor (01SC) shows the inhibition efficiency of 78.28% (0.2mM) by using a weight loss method. The influence of I−, Br− and Cl− anions raises the inhibition efficiency of the substituted 2,6-diphenyl piperidin-4-ones with semicarbazone due to the synergistic effect. The synergistic effect of halide ions was formed in the following order: KI > KBr > KCl.

Keywords: Mild steel; corrosion inhibition; halide ions; some substituted γ-2; c-6-diphenyl piperdin-4-one semicarbazone; sulphuric acid; synergistic effect (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18500506

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