Influence of Al–Si Coating on Oxidation and Hot Corrosion of a Nickel–base Super–alloy M951

Chinese Journal of Materials Research

2012, Vol. 26

Issue (6): 643-651 DOI:

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Influence of Al–Si Coating on Oxidation and Hot Corrosion of a Nickel–base Super–alloy M951

WANG Xinyue^1,2, XIN Li², WEI Hua², ZHU Shenglong², WANG Fuhui²

1.School of Materials and Metallurgy, Northeastern University, Shenyang 110819
2.State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Shenyang 110016

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WANG Xinyue XIN Li WEI Hua ZHU Shenglong WANG Fuhui. Influence of Al–Si Coating on Oxidation and Hot Corrosion of a Nickel–base Super–alloy M951. Chinese Journal of Materials Research, 2012, 26(6): 643-651.

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Abstract

Al–Si coating was deposited on a nickel-base super-alloy M951 by slurry technique. Isothermal and cyclic oxidation at 1100℃, hot corrosion behaviors in Na₂SO₄+25%K₂SO₄ and Na₂SO₄+25%NaCl at 850℃ were investigated. Morphologies and phase structure of the scale were analyzed by SEM, EDS and XRD. After isothermal and cyclic oxidation, mixed oxides of NiO, NiAl₂O_4,Nb₂O₅ and Al₂O₃ formed on the surface of the alloy, which spalled seriously during cyclic oxidation process. Stable α–Al₂O₃ scales were formed on the surface of Al–Si coating, which improve the oxidation resistance of the alloy significantly. Catastrophic corrosion occurred for the alloy after 40 hours in molten salts, while thin and continious θ–Al₂O₃ film formed on the surface of the coating, which provided effective protection for the alloy during the corrosion process.

Key words: materials failure and protection M951 super–alloy Al–Si coating isothermal oxidation cyclic oxidation hot corrosion

Received: 23 September 2012

ZTFLH:

TG174

Fund:

materials failure and protection, M951 super–alloy, Al–Si coating, isothermal oxidation, cyclic oxidation, hot corrosion

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2012/V26/I6/643

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