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Effect of climatic parameters on filiform corrosion of coated aluminum 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)
Statoil ASA, Norway.
2004 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 60, no 6, p. 584-593Article in journal (Refereed) Published
Abstract [en]

The effects of temperature, relative humidity, and wet-dry transition on initiation and propagation of filiform, corrosion on coated aluminum alloy 6016 (AA6016 [UNS A96016]) have been studied. Corrosion products formed in the filament were analyzed using Fourier transform infrared (FTIR)- microspectroscopy. The aluminum surfaces were tested in both milled finish and grinded conditions with chromium, phosphate, and titanium-zirconium-based pretreatment. An electrodeposited coat (ED coat) and a full paint system used for automotive applications (ED coat + topcoat) were investigated for the different combinations of mechanical finish, surface pretreatment, and coating system. In the temperature range between 5°C and 50°C, filiform corrosion, or underfilm corrosion in general, increased significantly. The effect of relative humidity and wet-dry cycling, on the other hand, seems to be strongly influenced by parameters like pretreatment, coating system, and temperature. Filiform corrosion was the highest in the range from 75% to 95% relative humidity (RH), and a distinct maximum was observed at 85% RH for some coating systems. However, filiform. corrosion propagated at humidity down to 40% to 50% RH. For specimens with chromate- and phosphate-based surface pretreatments, filiform, corrosion was lower after exposure to tests with wet-dry cycles. The samples with titanium-zirconium-based pretreatments, on the other hand, had a very poor filiform corrosion resistance in the cyclic test compared to exposures at constant relative humidity. © 2004, NACE International.

Place, publisher, year, edition, pages
National Assoc. of Corrosion Engineers International , 2004. Vol. 60, no 6, p. 584-593
Keywords [en]
Aluminum, Climatic parameters, Coatings, Filiform corrosion, Relative humidity, Surface pretreatment, Temperature, Aluminum alloys, Aluminum coatings, Atmospheric humidity, Corrosion resistance, Fourier transform infrared spectroscopy, Surface treatment, Titanium, Automotive applications, Effects of temperature, Fourier transform infrared microspectroscopy, Initiation and propagation, Surface pre-treatments, Corrosion
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-40449DOI: 10.5006/1.3287763Scopus ID: 2-s2.0-33947316058OAI: oai:DiVA.org:ri-40449DiVA, id: diva2:1359779
Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-14Bibliographically approved

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