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Application of scanning Kelvin probe, XANES and FTIR microspectroscopy for investigating the mechanisms of filiform corrosion on coated aluminium alloys
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
2004 (English)In: EUROCORR 2004 - European Corrosion Conference: Long Term Prediction and Modelling of Corrosion, 2004Conference paper, Published paper (Refereed)
Abstract [en]

Filiform corrosion is an active corrosion cell that moves across the metal surface underneath the coating, leaving a tail filled with corrosion products. Filiform corrosion is a main problem on coated aluminium alloys exposed to a humid atmosphere. The corrosion is generally initiated in defects in the coating and propagates in presence of aggressive ions (chloride, sulphate...), oxygen and sufficient relative humidity. The aim of this investigation is to provide more information on the mechanism of filiform corrosion on coated aluminium alloys using complementary localized techniques: the scanning Kelvin probe (SKP), the Fourier Transformed Infra-Red (FTIR) microspectroscopy and X-ray absorption near-edge structure (XANES) technique. SKP can provide information on the potential distribution during corrosion processes on both bare and coated metals with a spatial resolution of approximately 50 μm. Here, SKP measurements have been performed in order to identify the anodic and cathodic sites on filaments formed on coated aluminium during atmospheric exposure. FTIR microspectroscopy permits the identification of thin surface films of corrosion products both under ex-situ and in-situ conditions. As the spatial resolution is similar to the SKP, this technique has provided information on the composition of corrosion products formed in the head and in the tail of the filaments. The initiation and the propagation of filiform corrosion on coated aluminium alloy were investigated using an experimental set-up for in-situ infrared reflection absorption spectroscopy. It consisted of an in-situ cell, where samples were exposed to controlled humid conditions, and an optical microscope linked with a Fourier Transformed Spectrometer. XANES measurements were performed on coated chromated aluminium alloys in order to study the mechanisms of inhibition of chromate on the filiform corrosion. This was performed using a high resolution beam (e.g. 15-35 μm), making possible the establishment of X-ray maps of Cr(VI) and total chromium over the surface including the filament.

Place, publisher, year, edition, pages
2004.
Keywords [en]
Filiform corrosion, FTIR micro-spectroscopy, SKP, XANES, Atmospheric exposures, Cathodic sites, Coated metals, Corrosion process, Corrosion products, Ex situ, Experimental setup, Fourier, FTIR, FTIR microspectroscopy, High resolution, Humid atmospheres, Humid conditions, In-situ, Infrared reflection absorption spectroscopy, Metal surfaces, Micro spectroscopy, Optical microscopes, Potential distributions, Scanning Kelvin probes, Spatial resolution, Sulphates, Thin surface films, Total chromium, X-ray absorption near-edge structure techniques, X-ray maps, XANES measurements, Aluminum, Chlorine compounds, Chromates, Chromium, Coatings, Fourier transform infrared spectroscopy, Image resolution, Probes, Spectrometers, Aluminum corrosion
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-40442Scopus ID: 2-s2.0-84867244392OAI: oai:DiVA.org:ri-40442DiVA, id: diva2:1361016
Conference
European Corrosion Conference: Long Term Prediction and Modelling of Corrosion, EUROCORR 2004; Nice; France; 12 September 2004 through 16 September 2004
Note

Conference code: 93031; Export Date: 10 October 2019; Conference Paper; Correspondence Address: Lebozec, N.; Institut de la Corrosion, 220 rue Pierre Rivoalon, F-29200 Brest, France

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15Bibliographically approved

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