Abstract
SummaryIn 1968 field tests were started for lightfastness and corrosion resistance of colour anodized aluminium at exposure sites in Sheffield, Stockholm and Finspång and also at Bohus Malmön on the Swedish west coast. Some of the samples were removed after 2 and 5 years exposure. Third replicates are still exposed. The results in this paper refer to the first two removed and to some accelerated tests which were performed at the time of starting the field tests. Lightfastness has been shown to be excellent for electrolytically pigmented and for integral anodized material. No obvious colour fading could be observed. Conventional dyed material showed inferior lightfastness. Corrosion resistance was good for all variants. Pitting had occurred to a small extent, mainly on shielded surfaces. Resistance to dirt build-up appeared to be the same for all surface treatment variants. The degree of dirt build-up differed considerably between the different test sites. The erosion of the anodic oxide film was about 1·2 μm/year in Sheffield and about 0–4μm/year at the other sites.
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