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Corrosion inhibition of mild steel in acid environment using heterocyclic compounds

The present work represents an attempt to study the inhibition of corrosion of mild steel in acid media by seventeen furan derivatives, at 17 to 30 different inhibitor concentrations, from 0 up to 20 mMole per liter. / One of the techniques used to correlate the inhibitive action of organic compounds is based on the Linear Free Energy Relationship (LFER). The relationship is used to elucidate the mechanism of inhibition, by studying the effects of physico-chemical characteristics of the inhibitor molecules, such as functional group, polar function electron density, steric effects, and (pi)-orbital character of the donating electrons on the corrosion inhibition of mild steel in acid solution. / The results show that furfuryl alcohol, 2,5-furan dimethanol, and 2-furonitrile act as excellent inhibitors over the entire concentration range covered in this study, whereas the remaining investigated compounds exhibit substantial fluctuations in the inhibitive action with concentration. Frequent maxima and minima of inhibitive action have been observed. This behaviour can be explained on the basis of the different reaction mechanisms of the absorbed intermediate inhibitor complex at the metal surface. / The results of the study suggest that the inhibitive action of ortho-substituted compounds is influenced by steric effect. Although LFER is a valuable tool for comparing inhibitive actions of various compounds, other criteria should be considered. These criterion or special effects include polymerization, (pi)-orbital electrondelocalization, and mesomeric effects. Such effects could cause a compound to act as a good inhibitor, irrespective of considerations relating to electron affinity.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.72073
Date January 1984
CreatorsAli, Shakir A.
PublisherMcGill University
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Formatapplication/pdf
CoverageDoctor of Philosophy (Department of Chemical Engineering.)
RightsAll items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated.
Relationalephsysno: 000216834, proquestno: AAINL27292, Theses scanned by UMI/ProQuest.

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