LAUSR

The anodic electrochemical behaviors of selective laser melted Ti6Al4V were analyzed in environmentally friendly solutions, including NaCl solution, NaCl-ethylene glycol (NaCl-EG), and choline chloride-ethylene glycol (ChCl-EG). The passive and transpassive behaviors of Ti6Al4V in NaCl-EG and ChCl-EG were similar, which was significantly better than that in NaCl solution. This is because a better corrosion resistant passive film generated in the solvent EG than in the deionized water, despite with the same electrical conductivity. Typically, when the applied voltage increased to 30 VSCE, the current density was only 103.33 mA/cm² in NaCl-EG and 92.22 mA/cm² in ChCl-EG, which was much smaller than the 2287.78 mA/cm² in NaCl solution. Additionally, the surface morphology also confirmed that the samples had a better corrosion resistance in NaCl-EG and ChCl-EG than the NaCl solution, regardless of the applied voltage. Finally, electrochemical surface treatment was conducted on samples in all solutions, and the best surface quality was obtained in NaCl-EG.