Abstract
SummaryThis paper describes results of experiments carried out to assess the resistance to atmospheric weathering of architectural aluminium alloys coated with clear lacquers. Panels of two architectural aluminium alloys were pretreated in six different ways, coated with three different clear lacquers in three different coating thicknesses and exposed to industrial, marine and rural atmospheres respectively. While no difference was observed between the behaviour of the two alloys or of the three lacquers used in the experiments, there was a marked difference in the retention of original appearance between panels given different pretreatments: to a lesser extent, retention of original appearance was also influenced by the thickness of the lacquer coating. The deterioration of the appearance of panels was very fast when, before lacquering, they were only degreased or etched in a sodium hydroxide/sodium fluoride mixture without being adequately rinsed afterwards. Panels pretreated in sodium hydroxide/sodium ...
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