Adsorption, thermodynamic, and electrochemical studies of ketosulfide for mild steel in acidic mediumJournal of Adhesion Science and Technology

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Authors
Narayana Hebbar, B.M Praveen, B.M Prasanna, Venkatarangaiah T. Venkatesha, S.B. Abd Hamid
Year
2015
DOI
10.1080/01694243.2015.1081781
Subject
Materials Chemistry / Mechanics of Materials / Chemistry (all) / Surfaces, Coatings and Films / Surfaces and Interfaces

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Adsorption, thermodynamic, and electrochemical studies of ketosulfide for mild steel in acidic medium

Narayana Hebbara, B.M Praveena, B.M Prasannab, Venkatarangaiah

T. Venkateshac & S.B. Abd Hamidd a Department of Chemistry, Srinivas School of Engineering, Mukka,

Mangalore, India b Department of Chemistry, Shree Tharalabalu Jagadguru Institute of Technology, Ranebennur, Haveri, Karnataka, India c Department of Studies in Chemistry, School of Chemical

Sciences, Kuvempu University, Shankaraghatta, Karnataka, India d Nanotechnology and Catalysis Research Centre (NANOCAT),

University of Malaya, 50603 Kuala Lumpur, Malaysia

Published online: 04 Sep 2015.

To cite this article: Narayana Hebbar, B.M Praveen, B.M Prasanna, Venkatarangaiah T. Venkatesha & S.B. Abd Hamid (2015): Adsorption, thermodynamic, and electrochemical studies of ketosulfide for mild steel in acidic medium, Journal of Adhesion Science and Technology, DOI: 10.1080/01694243.2015.1081781

To link to this article: http://dx.doi.org/10.1080/01694243.2015.1081781

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D ow nl oa de d by [U niv ers ity of

Su sse x L ibr ary ] a t 2 3:4 5 0 6 S ep tem be r 2 01 5

Adsorption, thermodynamic, and electrochemical studies of ketosulfide for mild steel in acidic medium

Narayana Hebbara, B.M Praveena*, B.M Prasannab, Venkatarangaiah T. Venkateshac and S.B. Abd Hamidd aDepartment of Chemistry, Srinivas School of Engineering, Mukka, Mangalore, India; bDepartment of Chemistry, Shree Tharalabalu Jagadguru Institute of Technology, Ranebennur,

Haveri, Karnataka, India; cDepartment of Studies in Chemistry, School of Chemical Sciences,

Kuvempu University, Shankaraghatta, Karnataka, India; dNanotechnology and Catalysis

Research Centre (NANOCAT), University of Malaya, 50603 Kuala Lumpur, Malaysia (Received 19 February 2015; final version received 30 July 2015 accepted 31 July 2015)

The corrosion inhibition efficiency of ketosulfide was investigated by electrochemical methods in 1 M HCl solution at 303?333 K. The polarization method showed mixed-type inhibition characteristics of ketosulfide. Adsorption behavior of ketosulfide was studied and which followed the Langmuir adsorption isotherm. Thermodynamic parameters were also calculated using Gibb?s Helmholtz, Van?t Hoff and basic themodynamic equations. Activation parameters were calculated using Arrhenius and transition state equations. The morphology of mild steel surface was examined by scanning electron microscopic images in the absence and presence of ketosulfide.

Keywords: inhibitor; polarization method; corrosion; adsorption; scanning electron spectroscopy 1. Introduction

Mild steel has been extensively used in chemical industries for different purposes under different environments in handling alkalis, acids, and salt solutions.[1?3] The corrosion of steel has considerable amount of attention in academic and industrial concern.[4?6]

Corrosion inhibition of mild steel in acid solutions has become one of the most urgent and severe challenges in acid pickling process to prevent undesirable metal dissolution and excess acid consumption.[7?9] During the past decade, the inhibition of mild steel in acid solutions by different types of organic inhibitors has been extensively studied.[10?15] The majority of well-known corrosion inhibitors are the compounds containing nitrogen, oxygen, phosphorus and sulfur in their functional groups with aromatic and heterocyclic rings. Among them, N-heterocyclic compounds are considered to be the most effective corrosion inhibitors for steel in acid media.[16?18] It is well known that corrosion inhibition efficiency of organic compounds is related to their adsorption properties and they are dependent on the structure of the organic compounds, such as functional groups, steric factor and aromaticity.[19]

The corrosion inhibition properties of many planar pharmaceutical ingredients (green inhibitors) for mild steel were reported in literature.[20?22] Thus drugs with *Corresponding author. Email: bm.praveen@yahoo.co.in ? 2015 Taylor & Francis

Journal of Adhesion Science and Technology, 2015 http://dx.doi.org/10.1080/01694243.2015.1081781

D ow nl oa de d by [U niv ers ity of

Su sse x L ibr ary ] a t 2 3:4 5 0 6 S ep tem be r 2 01 5 planar structure were the promising inhibitors which encouraged us to choose a drug ketosulfide. The presence of electron rich N, O, S atoms, and ?-bonds in its structure might be in favor of its adsorption on the metal surface which give a scope for its study as a potential corrosion inhibitor.[23] The aim of the present investigation was to study the effect of ketosulfide as a corrosion inhibitor for mild steel in 1 M HCl. 2. Materials and methods 2.1. Material