Corrosion Behaviour of Mild Steel in 0.5 M Sulphuric Acid Media in the Presence of Potassium Chromate

Omotosho, Olugbenga Adeshola and Okeniyi, Joshua Olusegun and Ikotun, Jacob Olumuyiwa and Loto, C. A. and Popoola, A. P. I. (2018) Corrosion Behaviour of Mild Steel in 0.5 M Sulphuric Acid Media in the Presence of Potassium Chromate. Journal of Engineering and Applied Sciences, 13 (14). pp. 5789-5795. ISSN 1816-949X

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Abstract

This research investigates the behaviour ofK2Cr04 on mild steel corrosion in 0.5 M H2S04 at ambient temperature of 30°C. The study was conducted using weight loss and potentia-dynamic polarization measurements. Data were recorded from the weight loss tests while the readout from the potentiostat was doclllllented. Adsorption studies were also carried out. Fwthermore, an investigation was conducted using surface coverage against concentration plot to determine when the best surface would be obtained during the experiment. Results from the study revealed that inhibitor efficiency increased as inhibitor concentration increased. The potentia-dynamic polarization plot also identified the inhibition mechanism of action as mixed but predominantly anodic type inhibition with maximlllll Ecorr displacement of 68 m V. The adsorption of the inhibitor agrees with the Langmuir adsorption isotherm while the separation factor which is a component of the Langmuir expression showed a favourable adsorption. The Gibbs free energy of adsorption showed negative value ( -9.8 kJ/mol) depicting a spontaneous process with a prevalence of physical adsorption. The first day cmve showed the best surface coverage values across all inhibitor concentrations utilized.

Item Type:	Article
Uncontrolled Keywords:	Corrosion, weight loss, potentiodynamic polarization, Tafel slope, adsorption isotherm, physical adso tion
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	03 Jun 2020 07:05
Last Modified:	03 Jun 2020 07:05
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/13359

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