Electrochemical Corrosion Behaviors Before and After Laser Polishing of Additive Manufactured TC4 Titanium Alloy

In this study, laser polishing experiment of the additive manufactured TC4 titanium alloy with abrasive blasting is conducted in argon gas. Further, a polarization curve is plotted to verify the corrosion resistances of the surface before and after laser polishing and to analyze the effect of laser polishing on the corrosion resistance of the TC4 titanium alloy based on the surface roughness, grain size, surface residual stress, and microstructures. The results denote that the self-corrosion potential and self-corrosion current density of the polished surface arc greater than those of the initial surface, indicating that the polished surface exhibits a lesser corroded tendency when compared with that exhibited by the initial surface. However, if the polished surface corrodes, its corrosion rate is observed to be slightly greater than that of the initial surface. The increase in self-corrosion potential can be attributed to the decrease in the surface roughness of the material. Furthermore, the increase in self-corrosion current density can be attributed to grain refinement and residual tensile stress on the surface.