Nanosecond Pulsed Laser Irradiation of Titanium Alloy Substrate: E ects of Periodic Patterned Topography on the Optical Properties of Colorizing Surfaces

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2019-10Department
Física de la Materia Condensada; Ingeniería Mecánica y Diseño IndustrialSource
Coatings 2019, 9(10), 658Abstract
Most of the current works based on surface treatments of metals by laser marking technology
are focused on the modification of the color tonality of flat surfaces, or the development of specific
topography features, but the combination of both processes is not usually evaluated, mainly due
to the complexity of controlling the optical properties on rough surfaces. This research presents an
analysis of the influence of the micro-geometrical characteristics of periodic patterned laser tracks on
the chromaticity and reflectance of Ti6Al4V substrates. The samples were irradiated with an infrared
nanosecond pulsed laser in air atmosphere, taking as the control parameter the scan speed of the beam.
A roughness evaluation, microscopic inspection, and absorption and chromaticity examination were
conducted. Although micro-crack growth was detected in an isolated case (10 mm/s), the possibility
of adjusting the result color was demonstrated by controlling the heat-a ected zone thickness of the
textures. The results of rough/colored combined textures allow new perspectives in industrial design
to open, particularly in aesthetic applications with special properties.