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The nature of the surface film on steel treated with cerium and lanthanum cinnamate based corrosion inhibitors
journal contribution
posted on 2006-02-01, 00:00 authored by F Blin, S Leary, G Deacon, P Junk, Maria ForsythMaria ForsythThe corrosion inhibition mechanisms of new cerium and lanthanum cinnamate based compounds have been investigated through the surface characterisation of the steel exposed to NaCl solution of neutral pH. Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy was used to identify the nature of the deposits on the metal surface and demonstrated that after accelerated tests the corrosion product commonly observed on steel (i.e. lepidocrocite, γ-FeOOH) is absent. The cinnamate species were clearly present on the steel surface upon exposure to NaCl solution for short periods and appeared to coordinate through the iron. At longer times the Rare Earth Metal (REM) oxyhydroxide species are proposed to form as identified through the bands in the 1400–1500 cm−1 region. These latter bands have been previously assigned to carbonate species adsorbed onto REM oxyhydroxide surfaces. The protection mechanism appears to involve the adsorption of the REM–cinnamate complex followed by the hydrolysis of the REM to form a barrier oxide on the steel surface.
History
Journal
Corrosion scienceVolume
48Issue
2Pagination
404 - 419Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0010-938XeISSN
1879-0496Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2005, Elsevier Ltd.Usage metrics
Keywords
(C) Neutral inhibition(A) Rare earth elements(A) Mild steel(B) IR spectroscopy(C) Weight lossScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials Scienceneutral inhibitionrare earth elementsmild steelIR spectroscopyweight lossCOMPLEXESSPECTROSCOPYCARBOXYLATESMechanical Engineering
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