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| OXIDIZING–SULFIDIZING CORROSION OF Ni–xCr–10Al ALLOYS AT 700—800 ℃ |
| LU Lanying 1, PAN Taijun 2, NIU Yan 1 |
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Department of Material Science and Engineering, Changzhou University, Changzhou 213164 |
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Cite this article:
LU Lanying PAN Taijun NIU Yan. OXIDIZING–SULFIDIZING CORROSION OF Ni–xCr–10Al ALLOYS AT 700—800 ℃. Acta Metall Sin, 2011, 47(8): 1026-1031.
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Abstract The corrosion behavior of Ni–10Al and Ni–xCr–10Al (x=3, 5, 10) alloys at 700—800 ℃ in H2–H2S–CO2 mixtures was studied. The addition of Cr resulted in a ignificant reduction of the corrosion rate of the Ni–10Al alloy: at 700℃ the corrosion of Ni–10Al alloy showed a linear kinetic law, but Ni–xCr–10Al followed the multi–stage parabolic rate law; at 800 ℃ the corrosion of all the alloys followed a quasi–parabolic rate law. Ni–10Al alloy formed a complex scale of Ni3S2 and Al2O3, whereas Ni–3Cr–10Al formed an irregular scale of Al2O3 with a CrS inner corrosion region, and a thinlayer of Al2O3 formed on Ni–5Cr–10Al and Ni–10Cr–10Al alloys. The equilibrium partial pressures of oxygen and sulfur in the mixed gases were calculated to estimate the possible reactions between the alloy components and the gaseous atmosphere, and the corrosion mechanisms were also discussed.
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Received: 21 March 2011
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| Fund: Supported by National Natural Science Foundation of China(No.50971129) |
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