Abstract
We present the modification of Ti-6Al-4V surfaces with a diode end-pumped Nd:YVO4 laser by varying the distance between laser-produced micro(μ)-channels. We analyzed the influence of laser texturing on the morphology, microstructure, surface and corrosion properties of Ti-6Al-4V. SEM imaging reveals a characteristic μ-channel pattern with different scan line separations, while electron backscatter diffraction (EBSD) indicates that laser texturing with the current parameters influences the microstructure up to 2 µm deep with the most significant influence at the tips, where melting and rapid solidification occur. The Vickers hardness test indicates a surface hardening effect of the laser-textured compared to the as-received Ti-6Al-4V surfaces. The XPS analysis showed that the oxide layer on the laser-textured samples was considerably thicker compared to the as-received sample, at 20 and 7 nm, respectively. We observed that the wettability was strongly correlated with the scan line separation. The results show increased hydrophobicity with increased scan line separation. The corrosion resistance was improved for laser-textured surfaces compared to the as-received surface and increased with the scan line separation.
Highlights
In the last three decades, modification of metallic surfaces by various coatings, organic or polymeric, has become a part of an important procedure in enhancing the surface properties such as scratch resistance, oxidation and corrosion [1,2]
The common idea of both basic and applied research is to prolong the lifetime of metallic parts implemented in various industrial components and to reduce the expenses connected with material failure
The as-received Ti-6Al-4V surfaces were textured by a diode end-pumped Nd:YVO4 laser with different scan line separations, ∆x = 100, 180 and 280 μm, which define the surface morphology different scan line separations, ∆x = 100, 180 and 280 μm, which define the surface morphology (Figure 1b–g)
Summary
In the last three decades, modification of metallic surfaces by various coatings, organic or polymeric, has become a part of an important procedure in enhancing the surface properties such as scratch resistance, oxidation and corrosion [1,2]. The common idea of both basic and applied research is to prolong the lifetime of metallic parts implemented in various industrial components and to reduce the expenses connected with material failure. Corrosion protection of metallic surfaces is one of the most important steps in satisfying the needs of the demanding industrial applications. A variety of polymers have been known to serve for metallic surface protection, including epoxy resins, polyesters and polyurethanes [1,2,3]. To further improve the anticorrosion properties of polymer coatings and their mechanical properties, recently, different inorganic nanoparticles have been successfully incorporated into polymer matrices [4,5,6,7,8]
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