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| EFFECT OF Re ON THE HOT-CORROSION BEHAVIOR OF A NiCrAlY OVERLAY COATING |
| WEI Hua; HUANG Liang; LIANG Jingjing; SUN Xiaofeng; GUAN Hengrong; HU Zhuangqi |
| Superalloy Division;Institute of Metal Research; Chinese Academy of Sciences;Shenyang 110016 |
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Abstract Arc ion plating (AIP) was used to produce NiCrAlY and NiCrAlYRe overlay coatings. After heat treatment in vacuum, both of the coatings consisted of γ‘-Ni3Al, γ-Ni, β-NiAl and α-Cr. Re in the NiCrAlYRe coating existed in α-Cr and promoted the precipitation and thermal stability of α-Cr. The existence of α-Cr in the interface of coating and substrate lowered coefficient of thermal expansion and thus reduced thermal stress in the surface scale, improving adherence of the scale. The addition of Re obviously increased hot corrosion resistance of NiCrAlY in 90%Na2SO4+10 mass%K2SO4.
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Received: 02 November 2009
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Corresponding Authors:
WEI Hua
E-mail: hwei@imr.ac.cn
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| [1] Taylor M P, Evans H E. Formation of diffusion cells in LPPS MCrAlY coatings [J]. Mater. High Temp., 2000, 20: 461-466
[2] Wood G C. Fundamental factors determining the mode of scaling of heat resistant alloys [J]. Werkst. Korros., 1971, 22: 491-503
[3] Luthra K L, Briant C L. Surface segregation in M-Cr-Al-Y alloys [J].Metall. Trans., 1988, 19A: 923-938
[4] Smeggil J G, Funkenbusch A W, Bornstein N S. A relationship between indigenous impurity elements and protective oxide scale adherence characteristics [J]. Metall.Trans., 1986, 17A: 923-938
[5] Clemens D, Nickel H.TEM and SEM studies of protective alumina scale on NiCrAlY alloys [J]. J. Anal. Chem.,1996, 355: 703-706
[6] Saunders S R J, Nicholls J R. Hot salt corrosion test procedures and coating evaluation [J]. Thin Solid Film, 1984, 119: 247-269
[7] Czech N, Schmitz F, Stamm W.Microstructural analysis of the role of rhenium in advanced MCrAlY coatings [J]. Surf. Coat. Technol., 1995, 7: 28-33
[8] Beele W, Czech N, Quadakkers W J, et al. Long-term oxidation tests on a re-containing MCrAlY coating [J]. Surf. Coat. Technol.,1997, 94/95: 41-45
[9] Otsuka N, Rapp R A. Effect of chromate and vanadate anions on the hot corrosion of preoxidized Ni by a thin fused Na2SO4 film at 900℃ [J]. J. Electrochem. Soc., 1990, 137: 53-60
[10] Johnson J B, Nicholls J R, Hurst R C, et al. The mechanical properties of surface scale on nickel-base superalloys-Ⅱ.Contaminate corrosion [J]. Corros. Sci., 1978, 18: 543-553
[11] McKee D W, Shores D A, Lurthra K L. The effect of SO2 and NaCl on high temperature hot corrosion [J]. J. Electrochem. Soc., 1978, 125(3): 411-419
[12] Xiong Y L, Wood S A. Experimental determination of the solubility of ReO2 and the dominant oxidation state of rhenium in hydrothermal solutions [J]. Chem. Geol., 1999, 158: 245-256
[13] Karunaratne M S A, Reed R C. Interdiffusion of the platinum-group metals in nickel at elevated temperature [J]. Acta Mater., 2003,51: 2905-2911
[14] Liu C T, Sun X F, Guan H R, et al. Effect of rhenium addition to a nickel-base single crystal superalloy on isothermal oxidation of the aluminide coating [J]. Surf. Coat.Technol., 2005, 194: 111-118 |
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