Corrosion of Ti6Al4V ELI surfaces texturized by CO2 laser in SBF

Abstract

The purpose of our study was to evaluate the corrosion behavior of Ti6Al4V ELI surfaces textured with linear geometry using a CO2 laser. The linear geometry of the textures was obtained using a laserpro X380RX device with a 40W power supply. The characterization of the textured surface was performed by scanning electron microscope and X-ray dispersive energy spectroscopy. The effect of the separation distance of the linear textures on the corrosion resistance of the Ti6Al4V ELI alloy was evaluated by resistance to linear polarization, electrochemical impedance spectroscopy and potentiodynamic polarization curves in SBF. The results showed that the separation distance of the linear textures does not generate a significant effect on the corrosion resistance of the material. However, all the textured surfaces presented less resistance to corrosion than the unmodified material. This decrease in the corrosion resistance is attributed to the inclusion of elements such as molybdenum, silicon and phosphorus that are present in the lines due to the implementation of the cermark coating prior to the laser textured process.