The results of our examinations prove that the weathering conditions which are responsibel for the typical coating damage occurring on cars in Jacksonville can be simulated in a laboratory test successfully. We also found that conclusions based on one 14-week outdoor weathering test in Jacksonville can be very vague. Evaluating available meterological data from Jacksonvile, FL and studies on the relationship between wetting events and acid-related paint damage, we were able to prove that weather periods with frequent dew combined with the high UV radiation and temperature typical of Florida are the ''worst case'' weather conditions for current automotive OEM coatings. The good practice correlation to a certain ADF test variant merely gives reason to doubt whether we met this ''worst case'' in the Jacksonville test the results of which we used for our investigations. Furthermore, certain coatings showed great differences in the acid etch resistance depending on whether acid attacks occurred to a freshly-cured coating surface or to one that had already been exposed to UV radiation. The sequence of more or less severe weather periods in Jacksonville is not known, it varies with time. Therefore, it cannot be excluded, that a Jacksonville outdoor weathering test carried out in some other year might agree better with another variant of the ADF test. Considering our findings about the interaction of UV radiation and acid precipitation this work can be seen as the first approach to simulating Jacksonville outdoor weathering in an artificial weathering test including the special hardships of the Jacksonville climate. To confirm the statements about the ''worst case'' conditions in Jacksonville and to qualify the ADF test procedure, a further study was started on behalf of DFO (Deutsche Forschungsgesellschaft für Oberflächenbehandlung e.V.), a German surface treatment research society supported by six of the most important automotive manufacturers and several leading paint and raw material makers.
Automotive coatings in the aggressive climate of Jacksonville
Kraftfahrzeugbeschichtungen im aggressiven Klima von Jacksonville
2000
8 Seiten, 5 Bilder, 4 Tabellen, 3 Quellen
Conference paper
English
Automotive coatings in the aggressive climate of Jacksonville
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