Working Paper Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 26 August 2019 / Approved: 26 August 2019 / Online: 26 August 2019 (16:15:09 CEST)

A peer-reviewed article of this Preprint also exists.

Vazquez-Martinez, J.; Salguero, J.; Blanco, E.; González-Leal, J. Nanosecond Pulsed Laser Irradiation of Titanium Alloy Substrate: Effects of Periodic Patterned Topography on the Optical Properties of Colorizing Surfaces. Coatings 2019, 9, 658. Vazquez-Martinez, J.; Salguero, J.; Blanco, E.; González-Leal, J. Nanosecond Pulsed Laser Irradiation of Titanium Alloy Substrate: Effects of Periodic Patterned Topography on the Optical Properties of Colorizing Surfaces. Coatings 2019, 9, 658.

Journal reference: Coatings 2019, 9, 658
DOI: 10.3390/coatings9100658

Abstract

Surface treatments of metals based on laser marking technology is an important application in a wide range of industrial fields. By specific combinations of laser processing parameters, the modified surface leads to different textures with specific roughness and colored appearance. Most of current works are focused on the modification of 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 to control 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 under air atmosphere, taking as control parameter the scan speed of the beam. A roughness evaluation, microscopic inspection, absorption and chromaticity examination were conducted. Although micro-crack growth was detected in isolated case (10 mm/s), the possibility of adjusting the result color were demonstrated by controlling the thermal affected zone thickness of the textures. Results of rough/colored combined textures allow opening new perspectives in industrial design, particularly in aesthetic applications with special properties.

Subject Areas

titanium; laser marking; color; reflectance; roughness; oxidation

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