CORROSION BEHAVIOR OF Zr-Sn-Nb ALLOY

J Chin Soc Corr Pro

2002, Vol. 22

Issue (2): 124-128 DOI:

Research Report

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CORROSION BEHAVIOR OF Zr-Sn-Nb ALLOY

Wenjin Zhao;Zhi Miao;Hongman Jiang

中国核动力研究设计院核燃烧及材料国家级重点实验室

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Abstract The corrosion behaviors of Zr-Sn-Nb alloy (N18, N36) developed in China have been studied by out-of-pile autoclave in 360℃ wate r with 70 μg/g Li,in 400℃ and 500℃ high pressure steam.The results show that the nodular corrosion for two kinds of alloys did not occur after 500h,and Zr-4 alloy did after 4h in high-pressure oxygen at 500℃;that the weight gain of N18 samples is lower than Zr-4,and of N36 is higher than Zr-4 after 245 days in 400 ℃ high pressure steam;that the weight gain for two kinds of alloys samples is o nly 16%-25% that of Zr-4 after 300 days in 360℃ water with 70 μg/g Li.N18 allo y possesse s good corrosion resistance in both high temperature water and high pressure ste am.Addition of alloying element Nb in Zr-Sn binary system,on the one hand,solid solution of Nb in α-Zr can resist the detrimental effect of C,N impurities on c orrosion behavior,on the another hand,the formation of α-Nb second phase partic les and their uniform distribution in alloy can reduce greatly the oxidation rat io in high temperature water and high pressure steam.The nonuniform growth of o xide film occurs at the oxide film/metal interface,and that of oxide film become s more distinct after oxidant transition.

Key words: Zr-Sn-Nb alloy corrosion behavior

Received: 03 December 2001

ZTFLH:

TG178

Corresponding Authors: Wenjin Zhao

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Wenjin Zhao; Zhi Miao; Hongman Jiang. CORROSION BEHAVIOR OF Zr-Sn-Nb ALLOY. J Chin Soc Corr Pro, 2002, 22(2): 124-128 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I2/124

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