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INHIBITION EFFECT OF PHENYLAMINE ON THE CORROSION OF AUSTENITIC STAINLESS STEEL TYPE 304 IN DILUTE SULPHURIC ACID

Loto, R. T. and Loto, C. A. and Popoola, A. P. I. (2015) INHIBITION EFFECT OF PHENYLAMINE ON THE CORROSION OF AUSTENITIC STAINLESS STEEL TYPE 304 IN DILUTE SULPHURIC ACID. Canadian Journal of Pure and Applied Sciences, 9 (2). pp. 3409-3422. ISSN 1920-3853

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Abstract

The corrosion of austenitic stainless steel (type 304) in dilute sulphuric acid solutions in addition to recrystalized sodium chloride concentrates in the presence of specific proportions of phenylamine was studied with the aid of polarization resistance technique, electrode potential monitoring and coupon method. Results showed the overwhelming influence of the compound in corrosion inhibition with an inhibition efficiency of 97.5% from coupon analysis and 86.10% from polarization test at highest observed concentration of the inhibitor. Corrosion potential measurement showed potentials well with passivation values. Corrosion rate decreased progressively with increase in concentration of phenylamine. The adsorption of the compound on the steel surface followed the Langmuir isotherm model. Thermodynamic variables of adsorption surmised showed the interaction mode with the steel to be physiochemical and spontaneous. Observation from scanning electron microscopy and x-ray diffractometry showed the electrochemical impact on the surface topography and the phase compounds of the steel samples studied. Results from statistical analysis depict the sharp influence of inhibitor concentration on the electrochemical performance of the compound.

Item Type: Article
Uncontrolled Keywords: Aminobenzene, sulphuric acid, Langmuir, corrosion, inhibition.
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 01 Nov 2016 12:12
Last Modified: 01 Nov 2016 12:12
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/7378

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