Filiform Corrosion and Results of 10 Years Natural Weathering
Judith Pietschmann, Roswitha Gardein, FEM, Department light metal surface treatment LMOT, Schwaebisch Gmuend, Germany
Track: VALUE-ADDED PROCESSES - Customers
ABSTRACT --- In search of a pre-treatment for coated aluminum parts for
construction to prevent filiform corrosion, GSB International started a publiclyfunded
project in cooperation with member companies. For this purpose different
cleaning and etching conditions, and different pre-treatment and paint systems were
tested equally in laboratory tests and in natural weathering conditions for ten years.
Different locations in Europe, including Germany, Italy, Spain, Netherlands, and
England, showed the varied behavior of the coated samples. Filiform corrosion
behavior after ten years of natural weathering is shown in this paper, with
corresponding laboratory corrosion tests.
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