The objective of this research was to evaluate the corrosiveness of preservative solutions prepared with wood tar creosote. By distilling of wood tar, crude wood tar creosote was recovered at a temperature of 100-255 ºC. A fraction of this product was washed with a solution of sodium bicarbonate at 9%, resulting in purified wood tar creosote. Both fractions were enriched with 3% copper naphtenate, 3% zinc naphtenate, 3% cobalt naphtenate, 2% TBTO, 2% tributhyl-tin tribromophenate, 2% pentachlorophenol, or with 0.4% arsenic trioxide. A total of 16 preservative solutions were prepared of which 14 were enriched, besides the crude wood tar creosote and the purified wood tar creosote. SAE 1006 steel plates were exposed for 6 hours at temperatures of 25, 45 and 100 ºC, to the corrosive action of those solutions. The corrosiveness of wood tar creosote solutions was compared with that caused by coal tar creosote. The solutions with purified wood tar creosote were less corrosive than similar solutions prepared with crude wood tar creosote, although being more corrosive than the coal tar creosote.
Wood tar creosote; coal tar creosote; corrosion test
