Oxidation behaviour of the alloy IC-6 and protective coatings

In this work, NiCoCrAlY coatings were deposited on a new Ni-base alloy, IC-6. The oxidation kinetic curves of alloy IC-6, K17 and NiCoCrAlY coatings on alloy IC-6 at 900–1100 °C were obtained. The results indicated that the oxide scales consisted of α-Al 2O 3, NiAl 2O 4, NiO, as well as a small amou...

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Veröffentlicht in:Corrosion science 2004-03, Vol.46 (3), p.519-528
Hauptverfasser: Wang, Bing, Sun, Chao, Gong, Jun, Huang, Rongfang, Wen, Lishi
Format: Artikel
Sprache:eng
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Zusammenfassung:In this work, NiCoCrAlY coatings were deposited on a new Ni-base alloy, IC-6. The oxidation kinetic curves of alloy IC-6, K17 and NiCoCrAlY coatings on alloy IC-6 at 900–1100 °C were obtained. The results indicated that the oxide scales consisted of α-Al 2O 3, NiAl 2O 4, NiO, as well as a small amount of NiMoO 4 and MoO 2. These scales occurred after alloy IC-6 exposure at 900 °C for 100 h. The weight loss occurred when alloy IC-6 were exposed at 1050 and 1100 °C due to the formation of volatile MoO 3. After the NiCoCrAlY coating was deposited, the scales mainly contained α-Al 2O 3, when the specimens were oxidized at 900 °C, and α-Al 2O 3and Cr 2O 3 at 1050 °C. The formation of α-Al 2O 3 and Cr 2O 3 scales on NiCoCrAlY coating was directly responsible for improving oxidation resistance of the alloy IC-6.
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(03)00184-7