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SIZE EFFECT OF Cr AND Al PARTICLE ON THE OXIDATION BEHAVIOR OF ELECTRODEPOSITED Ni-Cr-Al COMPOSITE COATINGS |
YANG Xiuying1,2, ZHAO Yanhong1, PENG Xiao2, WANG Fuhui2 |
1. Polytechnic School, Shenyang Ligong University, Fushun 113122
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract Two electrodeposited Ni matrix composite coatings were prepared; one was Ni-11Cr-3Al (by mass%) prepared using nano-sized particles of Cr and Al and the other was Ni-11Cr-7Al composite prepared using micron-sized particles of Cr and Al. Compared with the electrodeposited micron-composite (EMC) Ni-11Cr-7Al, the electrodeposited nanocomposite (ENC) Ni-11Cr-3Al exhibited much homogeneous distribution of Cr and Al particles, because of an approximately 25-fold decrease in interparticle spacing. The significantly shorter interparticle spacing allowed the ENC Ni-11Cr-3Al to grow a continuous Cr2O3 layer first and then an Al2O3 layer underneath during a very short stage of oxidation. This is the fundamental reason for the result that the ENC, although it had a lower content of Al, was oxidized slower than the EMC Ni-11Cr-7Al during oxidation in air at 900℃. The size effect of the Cr and Al particles on the oxidation behavior of the electrodeposited Ni-Cr-Al composite coatings is discussed in detail.
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Received: 15 November 2010
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Corresponding Authors:
YANG Xiuying
E-mail: xyyang0821@163.com
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