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The nature of the surface film on steel treated with cerium and lanthanum cinnamate based corrosion inhibitors
journal contributionposted on 01.02.2006, 00:00 authored by F Blin, S Leary, G Deacon, P Junk, Maria ForsythMaria Forsyth
The 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.
Pagination404 - 419
LocationAmsterdam, The Netherlands
Publication classificationC1.1 Refereed article in a scholarly journal
Copyright notice2005, Elsevier Ltd.
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(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 lossCOMPLEXESSPECTROSCOPYCARBOXYLATES