Effect of an electrodeposited yttrium containing thin film on the high-temperature oxidation behaviour of TA6V alloy

NaCl induced corrosion of Ti-6Al-4V alloy at high temperature

“…In laboratory air, Ti-6Al-4V oxidation followed a parabolic rate law. Corrosion products were stratified with alumina in the outer part and rutile in the inner part of the oxide scale, after oxidation at 560 • C for 600 h. These observations are in accordance with previous papers [1][2][3][4]. Titanium alloys are known to allow dissolution of oxygen in the substrate below the oxide scale [3,5,6], leading to a decrease of ductility.…”

“…where m is the weight gain per unit area in g cm −2 , S is the sample surface area in cm 2 , t is the time in s and k p is the parabolic constant of oxidation in g cm −2 s −1 . There are in the literature, only two available values of k p for shorter durations of oxidation than 600 h. The first (1.7 × 10 −12 g 2 cm −4 s −2 ), proposed by Siab et al [1], was determined after an oxidation treatment of 5.5 h at 600 • C. The second (3.0 × 10 −12 g 2 cm −4 s −2 ), was proposed by Zhang et al [26] and determined from an oxidation treatment of 50 h at 600 • C. These values are both higher than the one determined in this study at 625 • C after 600 h oxidation. These differences could be explained by a transient effect, which is known to lead to faster kinetics at the beginning of the oxidation, as it can be noticed on the kinetic curve relative to 625 • C oxidation ( Fig.…”

“…Their major asset in high temperature applications is the presence of addition elements, such as aluminium, which enhance their oxidation behaviour. This beneficial effect towards oxidation resistance is mainly due to the formation of alumina Al 2 O 3 in the external part of the rutile layer [1][2][3][4].…”

Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperature

“…Titanium has a high affinity for oxygen and oxidizes by forming an external scale composed mainly of rutile TiO 2 , which grows by anionic diffusion. In case of Ti-based alloys containing Al, such as Ti-6Al-4 V or Ti-6Al-2Sn-4Zr-2Mo-Si, the outer part of the oxide layer often contains Al 2 O 3 [6][7][8][9][10][11][12]. Furthermore, Ti and Ti-based alloys can dissolve large quantities of oxygen, up to 33 at.…”

Palladium and tantalum aluminide coatings for high-temperature oxidation resistance of titanium alloy IMI 834

“…Several attempts were made by researchers in the field to develop suitable oxidation-resistant coatings for titanium alloys. [5][6][7][8][9][10][11][12][13][14] A patent was also filed on the production of intermetallic layers with high-melting point that can protect titanium alloys against oxidation. Aluminum-based coatings on titanium aluminides were also reported.…”