Article : Effect of Artificial Aging at the Deterioration Wheel on the Color ofFinish Treated Woods of Pinussylvestris and Quercusrobur
Auteur : A. Hakam , M. El Kortbi , M. Guelzim , K. Iaych,M. Rahouti, M. Ziani, M. Hachmi, A. Sesbou, M. EL Matar, L. Chrusciel and A. Merlin
Départment : Wood, Academy of Traditional Arts, Foundation of Hassan II Mosque, Casablanca, Morocco
Revue : Journal of Engineering and Applied Sciences
Date de publication : Novembre 2019
The durability of exterior wood finishes is not guaranteed with current finishing systems. Thus, the objective of this study was to evaluate the color change of different finishes applied of wood of most commercialized wood in Morocco, in order to find the best wood-finishing couple having the higher durability in outdoor use. Accelerated aging wheel tests were carried out according to, the following principle: the samples are successively exposed to ambient air, then immerged in water and exposed again to ambient air but under UV radiations. A wheel spin is performed in 90 min and a complete cycle is performed in 3 weeks, so that, a complete cycle counts 336 wheel revolutions. The samples tested on this aging wheel are woodblocks made of two wood species: Scots pine (Pinussylvestris) and Pedunculate oak (Quercusrobur). These samples were coated with four different finishes (two polyurethane finishes F and F and two acrylic finishes F and F ) and 1 2 3 4 exposed to accelerated weathering for 12 weeks. Colorimetric measurements in color system CIELab: Gloss (L*), green-red (a*) and blue-yellow (b*) coordinates, color saturation (C*) and tone angle (h*) were performed using an X-Rite Model SP62 spectrophotometer before and after aging treatments. The results showed that rotating wheel aging caused a decrease in the L* value and a change in the surface color of all the finishing pairs studied. For wood/finishing couples including Quercusroburas a wooden support, the Quercusrobur/ F has 3 the best resistance to color change while for wood/finish with Pinussylvestrisas a wooden support, the Pinussylvestris/F has the best resistance to color change.