Community Research and Development Information Service - CORDIS

Development of coatings for bronze protection

Coatings designed to protect outdoor bronze sculptures from corrosion and deterioration are being tested, in particular organic inorganic copolymers (organically modified ceramics (ORMOCER)). Different substrates, untreated or with artificial patina, are protected with different kinds of ORMOCER coating and compared with corresponding samples with conventional coatings (eg wax) and with untreated samples. Artificial weathering methods are used, including exposures close to natural weathering as well as exposure conditions which accelerate the corrosion (exchange in humidity and temperature, continuous condensation, ultraviolet (UV) test, atmospheres with high sulphur dioxide content). The corrosion progress of the samples is analysed by light microscopy (LM), scanning electron microscopy (SEM) (surface and cross section), X-ray microanalysis and infrared (IR) spectroscopy. The experiments are completed by several adhesion tests and investigations of the reversibility of the lacquer as well as electrochemical measurements.

Reported by

Fraunhofer Institut fuer Silicatforschung
Bronnbach 28
97877 Wertheim-Bronnbach
Germany
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