Synergistic corrosion inhibition of mild steel in aqueous chloride solutions by an imidazolinium carboxylate salt

Chong, Alison L., Mardel, James I., MacFarlane, Douglas R., Forsyth, Maria and Somers, Anthony E. 2016, Synergistic corrosion inhibition of mild steel in aqueous chloride solutions by an imidazolinium carboxylate salt, ACS sustainable chemistry and engineering, vol. 4, no. 3, pp. 1746-1755, doi: 10.1021/acssuschemeng.5b01725.

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Title Synergistic corrosion inhibition of mild steel in aqueous chloride solutions by an imidazolinium carboxylate salt
Author(s) Chong, Alison L.
Mardel, James I.
MacFarlane, Douglas R.
Forsyth, Maria
Somers, Anthony E.
Journal name ACS sustainable chemistry and engineering
Volume number 4
Issue number 3
Start page 1746
End page 1755
Total pages 10
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2016
ISSN 2168-0485
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Engineering, Chemical
Corrosion inhibitor
Organic salt
Mild steel
Summary Mild steel infrastructure is constantly under corrosive attack in most environmental and industrial conditions. There is an ongoing search for environmentally friendly, highly effective inhibitor compounds that can provide a protective action in situations ranging from the marine environment to oil and gas pipelines. In this work an organic salt comprising a protic imidazolinium cation and a 4-hydroxycinnamate anion has been shown to produce a synergistic corrosion inhibition effect for mild steel in 0.01 M NaCl aqueous solutions under acidic, neutral, and basic conditions; an important and unusual phenomenon for one compound to support inhibition across a range of pH conditions. Significantly, the individual components of this compound do not inhibit as effectively at equivalent concentrations, particularly at pH 2. Immersion studies show the efficacy of these inhibitors in stifling corrosion as observed from optical, SEM, and profilometry experiments. The mechanism of inhibition appears to be dominated by anodic behavior where dissolution of the steel, and in particular the pitting process, is stifled. FTIR spectroscopy provides confirmation of a protective interfacial layer, with the observation of interactions between the steel surface and 4-hydroxycinnamate.
Language eng
DOI 10.1021/acssuschemeng.5b01725
Field of Research 030307 Theory and Design of Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, ACS
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