Еlectrochemical behaviour of surface-modified commercially pure titanium in Ringer solution

The TiN coating obtained by vacuum-arc spraying on the surface of commercially pure VT1-0 titanium and thermodiffusion saturation in a nitrogen atmosphere was studied. The coatings were evaluated by electrochemical methods for determining their corrosion re­sistance in Ringer physiological solution. It was found that the TiN coating deposited on untreated titanium has twice lower corrosion current density of untreated titanium, while the nitrided surface, without and with the TiN coating, has a lower corrosion current den­sity by only 6 and 20% less, 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 VT1-0 titanium. Therefore, owing to the high electrochemical stability in Ringer solution, which contains Cl– ions, the simple surface modification tech­nology, and its non-toxicity, nitride coatings have a promising application in medicine.