Acceleration of the fixation of chromated wood preservatives by UV-radiation
H M Illner, H Willeitner, K Brandt
Preliminary laboratory tests demonstrated that the fixation of chromated water-borne wood preservatives may be accelerated by UV-radiation. The degree of fixation depends on the intensity of radiation and the prevailing temperature. Three hours radiation at 20°C in a device for artificial weathering diminished the leaching of chromium to 43% and of copper to 23% compared to not-radiated samples. Two hours radiation at 60°C gave almost complete fixation. Five to seven seconds radiation in a high energetic commercial plant for hardening of paints diminished the leaching of chromium to 75% and of copper to 30% and a second radiation of the same samples still increased the fixation. Further tests are necessary to obtain more details on the use of UV-radiation for fixation in practice.