eprintid: 11190
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/11/90
datestamp: 2023-11-10 03:25:43
lastmod: 2023-11-10 03:25:43
status_changed: 2023-11-10 01:14:40
type: article
metadata_visibility: show
creators_name: Ismail, M.C.
creators_name: Yahya, S.
creators_name: Raja, P.B.
title: Antagonistic effect and performance of CO2 corrosion inhibitors: Water chemistry and ionic response
ispublished: pub
keywords: Carbon dioxide; Coordination reactions; Electrochemical corrosion; Lunar surface analysis; Metabolism; Morphology; Potassium iodide; Scanning electron microscopy; Sodium chloride; Spectrometers; Steel corrosion; Surface analysis; Surface morphology; Urea; X rays, Antagonistic; Competitive adsorption; Corrosion inhibition efficiency; Electrochemical measurements; Electrochemical test; Energy dispersive x-ray; Iodide; X ray photoelectron spectrometers, Corrosion inhibitors
note: cited By 18
abstract: The synergism effect of urea and potassium iodide (KI) has been studied in two synthesized inhibitors, Inhibitor A (imidazole-free) and Inhibitor B (imidazole-containing) on the corrosion inhibition of A516 steel. The experiment was carried out in CO2�saturated 3 wt NaCl solutions through an electrochemical test and surface analysis. The electrochemical measurement showed the corrosion inhibition efficiency (IE) for Inhibitors A gives 69�90, while 65�88 for Inhibitors B. The surface morphology of steel after 7 days immersion in both synthesized inhibitors shows a reduction in corrosion attack as viewed through a Scanning Electron Microscope (SEM) and Energy-Dispersive X-ray (EDX). Analysis through X-ray Photoelectron Spectrometer (XPS) revealed the coordination of nitrogen elements on the steel surface indicating the interaction of significant functional groups. Both inhibitors performed competitive adsorption which characterized an antagonistic reaction. The inhibition mechanism was influenced by the molecular structure of inhibitors. The heterocyclic ring of imidazole with the possible anchoring site favors the ionic interaction. Functional groups of unshared electron pairs on nitrogen atoms have contributed to the coordination complexes roles as a ligand. Besides, the involvement of co-counter ions also influenced corrosion inhibition. The occurrences in bulk-interface-surface prior to the adsorption were discussed. © 2019 Elsevier B.V.
date: 2019
publisher: Elsevier B.V.
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070505568&doi=10.1016%2fj.molliq.2019.111504&partnerID=40&md5=78ff1f5bdba7d66613f27276b737ac31
id_number: 10.1016/j.molliq.2019.111504
full_text_status: none
publication: Journal of Molecular Liquids
volume: 293
refereed: TRUE
issn: 01677322
citation:   Ismail, M.C. and Yahya, S. and Raja, P.B.  (2019) Antagonistic effect and performance of CO2 corrosion inhibitors: Water chemistry and ionic response.  Journal of Molecular Liquids, 293.   ISSN 01677322