Effect of oxidation of nitride coatings on corrosion properties of Ti-6Al-4V alloy in 0.9% NaCl at 40°C

Abstract

The corrosion properties of Ti-6Al-4V alloy with oxidized thermodiffusion nitride coatings were investigated in isotonic 0.9% solution of NaCl at temperature of 40°C. It was shown that modification of nitride coatings by oxygen leads to a deterioration of the protective properties of nitrided surface of Ti-6Al-4V alloy. The protective properties of the alloy with nitride coatings modified by oxygen are determined by the composition of formed surface oxynitride film.

Isothermal oxidation kinetics of nitrided Ti-6Al-4V studied by infrared emissivity

“…Finally, the observed activation energy is also significantly higher than the values reported for TiN (110-136 kJ/mol), which suggests that the oxidation of this phase is not the rate-limiting step in this case [37]. On the contrary, Ti 2 N is known to be a better barrier against diffusion [38,39], although no activation energy has been found for the oxidation of this compound in air. Interestingly, it has been established that oxide growth on top of nitride phases proceeds by outward titanium diffusion [14], contrary to the inward oxygen diffusion that is mostly responsible for the oxidation of pure titanium [8].…”

Surface nitrided MXene sheets with outstanding electroconductivity and oxidation stability

“…Furthermore, due to the high oxidation activation energy of NH 3 -MXene (110 kJ mol À1 ), H 2 O 2 barely oxidizes Ti-N at room temperature (B25 1C). 57 Therefore, nitridation strongly contributes to protecting MXene from oxidation.…”

Effect of plasma nitriding treatment on structural, tribological and electrochemical properties of commercially pure titanium

“…Hence, several research works investigate them in simulated body fluid (SBF) and Ringer's solution. 4,[26][27][28] The corrosion resistance of titanium alloys in the SBF shows the recovery tendency after nitriding. It was reported that oxidation process of the nitrided titanium alloy leads to the deterioration of the protective properties of Ti-6Al-4V alloy.…”

“…It was reported that oxidation process of the nitrided titanium alloy leads to the deterioration of the protective properties of Ti-6Al-4V alloy. 28 In another study, Ti-6Al-4V alloys were nitrided at 750 °C for 4 h. These nitrided alloys were subjected to the corrosion test in Ringer’s solution. It was reported that nitriding of Titanium alloys increases the corrosion resistance.…”