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Mildew growth on automotive coatings influencing the results of outdoor weathering
Author(s) -
Wachtendorf V.,
Schulz U.,
Geburtig A.,
Stephan I.
Publication year - 2012
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201005784
Subject(s) - mildew , weathering , powdery mildew , coating , fungal growth , environmental science , mycelium , materials science , horticulture , composite material , geology , botany , geochemistry , biology
As the results of a 14 weeks outdoor exposure of a series of automotive coatings in South Florida, the panels were found to be overgrown with an almost closed layer of mildew. Pinholes remained as permanent surface damage after removing the mildew mycelium. The extent of the damage differed in dependence of the kind of the coating. By tracing the images and profiles of the coating surfaces systematically over all phases of weathering and the subsequent cleaning procedure, a connection between formation of pinholes and mildew growth could be found. Outdoor weathering tests in other regions of Florida as well as in Europe and Australia showed that pinholes caused by mildew attack could also be found in all other locations, but always to a lower extent than in South Florida. The standardised mildew tests EN ISO 846 and MIL‐STD 810F for laboratory exposure failed to reproduce the formation of pinholes.