Die atmosphärische Korrosion von Kupfer und Bronze im Rahmen des UN/ECE-Expositionsprogramms. Zwischenbericht nach 4-jähriger Bewitterung

The atmospheric corrosion of copper and bronze within the UN/ECE Exposure Programme. Intermediate report after 4 years of exposure Accompanied by an extensive measuring programme for environmental data, copper (DIN 1787) and bronze samples (DIN 1705) were exposed at 39 test sites in 14 countries and examined afterwards. Measured were the weight change, the mass loss (after pickling of the corrosion products), the colour changes (trichromatic colorimetry), the chemical composition of the corrosion products (Debye-Scherrer), the layer thickness (eddy-current method), and the roughness of the weathered surface (perthometer). The corrosion data are related with the environmental data, especially the concentration of sulfur dioxide, the relative humidity and the conductivity of precipitations.