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| HIGH TEMPERATURE OXIDATION BEHAVIOR OF A NOVEL FINE-GRAINED Ni3Al COATING |
| LI Mingfei1,2,3, PENG Xiao2, WANG Fuhui1,2
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1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
3. PetroChina Pipeline R & D Center, Langfang 065001 |
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Abstract Fine-grained γ'-Ni3Al coatings were developed by a two-step process: co-electrodeposition of Ni with Al particles and subsequent annealing in vacuum at 600℃ or 800℃. After oxidation at 1000℃ in air for 20 h, the scales formed on both coatings exhibited better adhesion than that on a coarse-grained Ni3Al alloy, because the fine-grained coating structure suppressed the formation of voids at the scale/metal interface. Moreover, the scale formed on the coating by annealing at 800℃ consisted of NiO, NiAl2O4 and Al2O3, while the scale on the coating by annealing at 600℃ consisted of NiAl2O4 and Al2O3. The reason for this result is related to that the latter coating had a finer-grained structure, which promoted rapid formation of a continuum layer of Al2O3.
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Received: 13 September 2010
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Corresponding Authors:
LI Mingfei
E-mail: mfli@imr.ac.cn
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