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| EFFECT OF ADDING Cu ON THE CORROSION RESISTANCE OF M5 ALLOY IN SUPERHEATED STEAM AT 500℃ |
| LI Shilu1), YAO Meiyi1), ZHANG Xin1), GENG Jianqiao1), PENG Jianchao2), ZHOU Bangxin1) |
1) Institute of Materials, Shanghai University, Shanghai 200072
2) Key Laboratory for Advanced Micro-Analysis, Shanghai University, Shanghai 200444 |
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Cite this article:
LI Shilu YAO Meiyi ZHANG Xin GENG Jianqiao PENG Jianchao ZHOU Bangxin. EFFECT OF ADDING Cu ON THE CORROSION RESISTANCE OF M5 ALLOY IN SUPERHEATED STEAM AT 500℃. Acta Metall Sin, 2011, 47(2): 163-168.
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Abstract The effect of Cu content on the corrosion resistance of Zr-1%Nb-xCu (x=0.05%-0.5%, mass fraction) was investigated in superheated steam at 500 ℃ and 10.3 MPa by autoclave tests. The microstructures of the alloys and oxide films on the corroded specimens were observed by TEM and SEM, respectively. The results showed that when the Cu content was below 0.2%, the corrosion resistance of the alloys was markedly improved with the increase of Cu content, while further addition of Cu did not lead to a further improvement in the corrosion resistance. When the Cu content was below 0.2%, the Cu mainly dissolved in the α-Zr matrix. And when the Cu content was more than 0.2%, part of Cu precipitated as Zr2Cu second phase particles. When the α-Zr matrix was oxidized, the Cu dissolved in the α-Zr could delay the process that the vacancies in the oxide film diffused and coalesced to form pores, and the pores developed into micro-cracks. Therefore, the corrosion resistance of the alloys was enhanced. It can be concluded that the Cu concentration in the α-Zr matrix, rather than the second phase particles containing Cu, is the main reason that the addition of Cu improves the corrosion resistance of M5 alloy in superheated steam at 500 ℃ and 10.3 MPa.
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Received: 14 July 2010
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| Fund: Supported by National Natural Science Foundation of China (Nos.50871064 and 50971084), High Technology Research and Development Program of China (No.2008AA031701), Natural Science Foundation of Shanghai (No.09ZR1411700) and Shanghai Leading Academic Discipline Project (No.S30107) |
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