Koroze kovových spojovacích prostředků ve dřevĕ modifikovaném silikony

Under certain circumstances, timber protective coatings may accelerate corrosion of metallic fasteners. The phenomenon of metal corrosion in wood chemically modified with silicones is a crucial factor for definition of appropriate rules for application of these materials on timber. The study presents results of the impact of modified spruce (Picea Abies L.), oak (Quercus SPP.) and larch (Larix decidua Mill.) timber and standard steel, copper and galvanised steel nails. Samples of timber with driven nails were exposed to the environment of 30°C temperature and 100% atmospheric humidity for a period of 6 weeks, when humidity of wood approximated the point of fibre saturation. After the exposure, the surface of steel nails removed from the timber was visually evaluated; corrosion products from selected samples were analysed using infrared spectroscopy. Based on the analyses results, the hypothesis of material compatibility between modified spruce (Picea Abies L.) timber and steel fixtures in the environment with high atmospheric humidity was formulated. After the exposure period, the extent of the surface corrosion of steel nail was lower than in untreated reference timber (without the protective coating).