Electrochemical behavior of surface-modified commercially pure titanium in Ringer’s solution

The TiN coating obtained by vacuum-arc spraying on the surface of commercially pure VТ1‑0 titanium and thermodiffusion saturation in a nitrogen atmosphere was studied. The coatings were evaluated by electrochemical methods to determine their corrosion resistance in Ringer’s physiological solution. The TiN coating has twice lower corrosion current density than the untreated titanium, while the nitrided surface, without and with the TiN coating, has a lower corrosion current density by only 6 and 20%, respectively. The TiN coating deposited on untreated titanium has the highest corrosion resistance, and the nitrided surface has the lowest corrosion resistance. Despite this ranking, the corrosion resistance of all investigated coatings is higher than that of the untreated VТ1‑0 titanium. Therefore, owing to the high electrochemical resistance in Ringer’s solution, which contains Cl⁻-ions, the simple surface modification technology, and its non-toxicity, nitride coatings have a promising application in medicine.