Effects of TiN coating on the corrosion of nanostructured Ti-30Ta-xZr alloys for dental implants

► Electrochemical characteristics of a titanium nitride (TiN)-coated/nanotube-formed Ti-30Ta-xZr (x = 3, 7 and 15 wt%) alloys for biomaterials have been researched by using the magnetic sputter and electrochemical methods. ► The interspace between the nanotubes was approximately 20, 80 and 200 nm for Zr contents of 3, 7 and 15 wt %, respectively. ► The corrosion resistance of the TiN-coated on the anodized Ti-30Ta-xZr alloys was higher than that of the un-treated Ti alloys, indicating a better protective effect.