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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Inhibition of mild steel corrosion in acidic medium using synthetic and naturally occurring polymers and synergistic halide additives
Corrosion Science, Volume 50, No. 7, Year 2008
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Description
The corrosion inhibition of mild steel in H2SO4 in the presence of gum arabic (GA) (naturally occurring polymer) and polyethylene glycol (PEG) (synthetic polymer) was studied using weight loss, hydrogen evolution and thermometric methods at 30-60 °C. PEG was found to be a better inhibitor for mild steel corrosion in acidic medium than GA. The effect of addition of halides (KCl, KBr and KI) was also studied. Results obtained showed that inhibition efficiency (I%) increased with increase in GA and PEG concentration, addition of halides and with increase in temperature. Increase in inhibition efficiency (I%) and degree of surface coverage (θ) was found to follow the trend Cl- < Br- < I- which indicates that the radii and electronegativity of the halide ions play a significant role in the adsorption process. GA and PEG alone and in combination with halides were found to obey Temkin adsorption isotherm. Phenomenon of chemical adsorption is proposed from the trend of inhibition efficiency with temperature and values Δ Gads0 obtained. The synergism parameter, SI evaluated is found to be greater than unity indicating that the enhanced inhibition efficiency caused by the addition of halides is only due to synergism. © 2008 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Umoren, Saviour Alphonsus
Nigeria, Uyo
University of Uyo
Ogbobe, Okoro
Nigeria, Owerri
Federal University of Technology, Owerri
Igwe, Isaac O.
Nigeria, Owerri
Federal University of Technology, Owerri
Ebenso, Eno E.
South Africa, Lesotho
National University of Lesotho
Statistics
Citations: 294
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.corsci.2008.04.015
ISSN:
0010938X
Research Areas
Health System And Policy