Physico-chemical characterization of aerosols produced by laser paint sripping
Congress title :CFA 2007/2008 - 23ème Congrès Français sur les Aérosols
Congress location :Paris
Congress date :16/01/2008
A surface decontamination process, laser ablation, is here considered. This technology is promising for paint stripping. A complete automation of the process is possible, it is precise and produces a reduced waste volume. Nevertheless, its use leads to aerosols emission. They can present drawbacks for the process efficiency but also a risk for the health of operators. It is necessary to study them for the process industrialization and, from a fundamental point of view, in order to obtain a better understanding of laser-paint interaction. Experiments of particle characterization have shown that, during the 532 nm nanosecond laser ablation of a green acrylic paint, produced aerosols are composed, in number, mainly of nanoparticles but also of submicronic particles. Two well separated morphologies have been revealed : aggregates and spheres. These particles come from two different formation mechanisms. Nanometer aggregates result from the polymer vaporization and from a coagulation mechanism, spherical submicronic particles, probably from the pigment TiO2 mechanical ejection. In-situ measurements of transmitted and scattered light intensity by the plume during its expansion have also been performed to validate the assumptions.