Corrosion of fasteners in heat-treated wood – progress report after two years’ exposure outdoors

IRG/WP 05-40296

J Jermer, B-L Andersson

The corrosion of common fastener materials now in use - mild steel, zinc-coated steel, aluminium and Sanbond Z-coated steel – has been evaluated after two years’ exposure outdoors in untreated and heat-treated spruce (Picea abies) respectively. Spruce from South-western Sweden was used. The heat-treatment was carried out in Finland according to the ThermoWood process at a maximum temperature of 220 °C for five hours. The results so far show that the corrosion of fasteners in heat-treated wood according to the particular specification is more severe than in untreated wood. Mild steel and zinc-coated steel has been most susceptible. Stainless steel is hardly attacked at all.

Keywords: Heat-treatment, thermal treatment, corrosion, fasteners, nails, screws

Conference: 05-04-24/28 Bangalore, India

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