Adhesion and corrosion resistance of laser-oxidized titanium in potential biomedical application.

Abstract This study presents an analysis of the impact of the oxide layers, prepared by means of laser radiation in ambient air with different process parameters, on the morphology, corrosion resistance and adhesion properties of titanium grade 2. The samples were irradiated in and out of the focal plane, using a commonly-available fiber laser (Yb:glass) system. The microscopic examination, colorimetry, roughness, chemical Raman analysis, electrochemical tests (electrochemical impedance spectroscopy) as well as adhesion, wettability and scratch-tests were conducted. The study has shown that laser oxidation, depending on the choice of process parameters, can contribute to both the improvement and deterioration of the surface quality, including the size and amount of microcracks, other defects or heterogeneities, roughness, and adhesion. The samples manufactured in the focal plane exert a higher corrosion resistance, higher adhesion and lower roughness, compared to those irradiated out of the focal plane. The aim of this study was to broaden the knowledge about the nature and influence of laser-induced oxidation in and out of the focal plane on selected properties of oxide layers. Highlights • Samples treated in the focal plane exert increase of the corrosion resistance. • Laser-induced coatings exert a hydrophilic character (water contact angle <90°). • Samples treated in the focal plane exert decrease in roughness. • Laser-induced coatings exert a high adhesion to the substrate. [ABSTRACT FROM AUTHOR]