Корозійна поведінка титану з оксинітридними покриттями у фізіологічному розчині

In present work the corrosion-electrochemical behavior of titanium alloy Grade 2 with combined coatings - presaturated with nitrogen and oxygen diffusion layer by thermal-chemical treatment and oxynitride coating TiNxOy with nearly equiatomic compositions deposited by magnetron sputtering - in physiological saline (isotonic solution of 0,9% NaCl) was studied. It was found that oxynitride coatings increase the corrosion resistance in 1,2 times as compared to nontreated alloy. When titanium alloy was presaturated with oxygen or nitrogen the combination of oxynitride coating and diffusion layer of thickness 50 μm assists in additional enhancement of corrosion properties in 1,5-3 times

Gas nitriding and subsequent oxidation of Ti-6Al-4V alloys

Ti-6Al-4V alloys consisting of α-Ti grains and intergranular β-Ti islands were nitrided at 850°C for 1 to 12 h under a nitrogen pressure of 1 Pa. With increasing nitriding time, the Ti-N compound layer became thicker, and the α-Ti diffusion zone containing dissolved nitrogen became wider. In the Ti-N compound layer, the initially formed Ti2N became TiN as the nitriding progressed. The nitride layers were oxidized to rutile-TiO2 after oxidation at 700°C for 10 h in air