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In situ studies of the initiation and propagation of filiform corrosion on aluminium
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)
2003 (English)In: Proceedings - Electrochemical Society, 2003, p. 111-122Conference paper, Published paper (Refereed)
Abstract [en]

We have investigated the initiation and propagation of filiform corrosion on coated aluminium surfaces was using in situ FTIR microspectroscopy and the scanning Kelvin probe. During the initiation partially hydrolysed aluminium chloride was formed in a defect on the coated surface. The conditions in the defect resembled the environment that is found in growing pits with low pH and high chloride concentration close to the coating interface. This weakened the adhesion of the organic coating and initiated the formation of a filament. The movement of the active head was followed with in situ FTIR microspectroscopy in humid air using the characteristic IR band around 2500 cm-1 from Al(H2O)6 3+. This band is present in spectra from partially hydrolysed aluminium chloride, which was found in the head during propagation of the filament. The absorption of water in the hygroscopic corrosion products in the head of the filament was followed by measuring the changes in the intensity of the Al(H2O)6 3+ band during variation in the relative humidity.

Place, publisher, year, edition, pages
2003. p. 111-122
Keywords [en]
Adhesion, Aluminum foil, Chloride minerals, Clad metals, Coated materials, Concentration (process), Corrosion, Defects, Hydrolysis, Organic coatings, pH effects, Pitting, Scanning, Coated aluminum surfaces, Filiform corrosions, Kelvin probes, Microspectroscopy, Aluminum
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-40450Scopus ID: 2-s2.0-3042791918OAI: oai:DiVA.org:ri-40450DiVA, id: diva2:1359777
Conference
Corrosion and Protection of Light Metal Alloys - Proceedings of the International Symposium, 12 October 2003 through 17 October 2003, Orlando, FL.
Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-14Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • en-GB
  • en-US
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