The efficiency and durability of gas turbines, jet engines, and other high-temperature machinery are critically affected by hot corrosion. In this study, nanostructured thermal barrier coatings (TBCs) with a chromium/cobalt–aluminium–yttrium (Cr/CoAlY) bond coat and an 8 weight percent (wt.%) zirconia–yttria (ZrO2–Y2O3) ceramic top layer were deposited on Superni-718 substrates at 100 °C, 150 °C, and 200 °C using magnetron sputtering. Hot-corrosion tests were conducted for 100 cycles at 1173 K. The coatings’ microstructural features and elemental composition before and after corrosion were characterized by field emission scanning electron microscopy (FESEM) and energy-dispersive spectroscopy (EDS), while phase evolution and oxide formation during cyclic exposure were analysed using X-ray diffraction (XRD). Results confirmed that all coated specimens exhibited improved corrosion resistance compared to the substrate. Among them, the coating deposited at 200 °C showed the lowest parabolic rate constant (kp = 0.96313 × 10−10 g2 cm−4 s−1), indicating the best performance.
LiuZZhangWHuangJ, et al.High-temperature corrosion and protection of thermal barrier coatings for aeroengines and gas turbines. J Chin Soc Corros Prot2023; 43: 1001–1018.
2.
WanXDuanXHeP, et al.Hot corrosion mechanisms and corrosion resistance improvement strategies for thermal barrier coatings. J Mater Sci2025; 60: 1–30.
3.
WuYGuoXHeD. Research progress of CMAS corrosion and protection methods for thermal barrier coatings in aero-engines. J Mater Eng2023; 51: 1–15.
4.
YeDWuFXuZ, et al.Research on modified thermal barrier coatings against CMAS corrosion driven by a mechanism–data hybrid model. Coatings2024; 14: 1513.
5.
KumarVBalasubramanianK. A comprehensive review on the hot corrosion and erosion performance of thermal barrier coatings. Prot Met Phys Chem Surf2022; 58: 1119–1137.
6.
WeiZMengGHChenL, et al.Progress in ceramic materials and structure design toward advanced thermal barrier coatings. J Adv Ceram2022; 11: 985–1068.
KrauseARGarcesHFDwivediG, et al.CMAS-induced degradation and failure of air plasma sprayed yttria-stabilized zirconia thermal barrier coatings. Acta Mater2012; 60: 3737–3745.
9.
LeviCGHutchinsonJWVidal-SétifMH, et al.Environmental degradation of thermal barrier coatings by molten deposits. MRS Bull2012; 37: 932–941.
10.
DrexlerJMShinodaKOrtizAL, et al.Air plasma sprayed thermal barrier coatings resistant to high-temperature attack by glassy deposits. Acta Mater2010; 58: 6835–6844.
11.
ClarkeDROechsnerMPadtureNP. Thermal-barrier coatings for more efficient gas-turbine engines. MRS Bull2012; 37: 891–898.
12.
RappRA. Hot corrosion of materials: a fluxing mechanism?Corros Sci2002; 44: 209–221.
13.
PettitFSMeierGH. Oxidation and hot corrosion of superalloys. In: Superalloys 1984. Warrendale (PA): TMS, 1984, pp.651–687.
14.
VaßenRJarligoMOSteinkeT, et al.Overview on advanced thermal barrier coatings. Surf Coat Technol2010; 205: 938–942.
15.
AygunAVasilievALPadtureNP, et al.Novel thermal barrier coatings resistant to high-temperature attack by glassy deposits. Acta Mater2007; 55: 6734–6745.
16.
KrämerSYangJLeviCG, et al.Thermochemical interaction of thermal barrier coatings with molten CMAS deposits. J Am Ceram Soc2006; 89: 3167–3175.
17.
MercerCFaulhaberSEvansAG, et al.A delamination mechanism for thermal barrier coatings subjected to CMAS infiltration. Acta Mater2005; 53: 1029–1039.
18.
BoromMPJohnsonCAPelusoLA. Role of environmental deposits and operating surface temperature in spallation of air plasma sprayed thermal barrier coatings. Surf Coat Technol1996; 86–87: 116–126.
19.
StottFHde WetDJTaylorR. Degradation of thermal-barrier coatings at very high temperatures. MRS Bull1994; 19: 46–49.
20.
GledhillADReddyKMDrexlerJM, et al.Mitigation of damage from molten fly ash to air plasma sprayed thermal barrier coatings. Mater Sci Eng A2011; 528: 7214–7221.
21.
PoerschkeDLShawJHVermaN, et al.Interaction of yttrium disilicate environmental barrier coatings with calcium-magnesium-iron alumino-silicate melts. Acta Mater2016; 120: 329–340.
22.
SchulzULeyensCFritscherK, et al.Some recent trends in research and technology of advanced thermal barrier coatings. Aerosp Sci Technol2003; 7: 73–80.
23.
WellmanRGNichollsJR. A review of the erosion of thermal barrier coatings. J Phys D Appl Phys2007; 40: R293–R305.
24.
HutchinsonJWEvansAG. On the delamination of thermal barrier coatings in a thermal gradient. Surf Coat Technol2002; 149: 179–184.
25.
GoebelJAPettitFSGowardGW. Mechanisms for the hot corrosion of nickel-base alloys. Metall Trans1973; 4: 261–278.
26.
LuthraKLLeBlancOH. Low temperature hot corrosion of Co–Cr–Al alloys. Oxid Met1987; 27: 243–256.
27.
JonesRL. Some aspects of hot corrosion of thermal barrier coatings. J Therm Spray Technol1997; 6: 77–84.
28.
BornsteinNS. Reviewing sulfidation corrosion—yesterday and today. JOM1996; 48: 37–39.
29.
EliazNShemeshGLatanisionRM. Hot corrosion in gas turbine components. Eng Fail Anal2002; 9: 31–43.
30.
NiranatlumpongPKoiprasertH. Phase transformation of NiCrAlY coating in a sulfate environment at high temperatures. Oxid Met2011; 75: 21–36.
31.
SmialekJLArcherFAGarlickRG. Turbine airfoil degradation in the Persian Gulf War. JOM1994; 46: 39–41.
32.
KrämerSFaulhaberSChambersM, et al.Mechanisms of cracking and delamination within thick thermal barrier systems subjected to CMAS penetration. Mater Sci Eng A2008; 490: 26–35.
33.
HutchinsonJWHeMY. Buckling of cylindrical sandwich shells with metal foam cores. Int J Solids Struct2000; 37: 6777–6794.
