The corrosion inhibition mechanism of new rare earth cinnamate compounds — electrochemical studies

Blin, F., Koutsoukos, P., Klepetsianis, P. and Forsyth, M. 2007, The corrosion inhibition mechanism of new rare earth cinnamate compounds — electrochemical studies, Electrochimica acta, vol. 52, no. 21, pp. 6212-6220, doi: 10.1016/j.electacta.2007.04.001.

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Title The corrosion inhibition mechanism of new rare earth cinnamate compounds — electrochemical studies
Author(s) Blin, F.
Koutsoukos, P.
Klepetsianis, P.
Forsyth, M.ORCID iD for Forsyth, M.
Journal name Electrochimica acta
Volume number 52
Issue number 21
Start page 6212
End page 6220
Publisher Elsevier Science Pub. Co.
Place of publication New York, N.Y.
Publication date 2007-06-20
ISSN 0013-4686
Keyword(s) corrosion inhibitors
rare earth metal salts
organic inhibitors
Summary A combination of linear polarisation resistance (LPR) and cyclic potentiodynamic polarisation (CPP) measurements demonstrated that the lanthanum-4 hydroxy cinnamate compound could inhibit both the cathodic and anodic corrosion reactions on mild steel surfaces exposed to 0.01 M NaCl solutions. However, the dominating response was shown to vary with inhibitor concentration. At the concentrations for which the highest level of protection was achieved, both REM-4 hydroxy cinnamate (REM being lanthanum and mischmetal) displayed a strong anodic behaviour for mild steel and their inhibition performance, including their resistance against localised attack, improved with time.

Electrochemical impedance spectroscopy (EIS) measurements and modelling were carried out so as to propose a simple electrical model and correlate the extracted parameters to the inhibition mechanism put forward for REM-cinnamate based compounds. The results supported the high corrosion inhibition performance of the compounds as well as the build-up of a protective film with time. Based on a two-layer model the results suggested that the upper layer of the inhibitor film seemed to offer less resistance to the diffusion of electrochemically active species than the highly resistive inner layer at the film/metal interface.
Language eng
DOI 10.1016/j.electacta.2007.04.001
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Elsevier Ltd.
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