Influence of Laser Marking Parameters on the Structure and Corrosion Resistance of Titanium Nickelide-Based Alloy Implants

The influence of the parameters of laser treatment performed for marking on the roughness and structure of the surface layers and the corrosion resistance of implants made of a Ti–55.8 wt % Ni titanium nickelide-based alloy is studied. Laser treatment at a radiation power of 4–6 W and a modulation frequency of 170 kHz is found to form a TiO2 oxide layer 40–52 nm thick, which provides satisfactory color saturation of the treated surface at a remelted layer thickness not exceeding 2 μm, and to preserve the high pitting and fretting corrosion resistance of the material.