Zr-Sn-Nb合金的腐蚀行为研究

中国腐蚀与防护学报

2002, Vol. 22

Issue (2): 124-128

研究报告

本期目录 | 过刊浏览

Zr-Sn-Nb合金的腐蚀行为研究

赵文金;苗志;蒋宏曼

中国核动力研究设计院核燃烧及材料国家级重点实验室

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

全文: PDF(200 KB)

摘要: 研究了我国开发的Zr-Sn-Nb合金(N18和N36)在360℃、18.6 MPa含LiOH高温高压水，400℃和500℃、10.3 MPa过热蒸汽中的腐蚀行为.结果表明，两种合金试样在500℃腐蚀500 h未出现疖状腐蚀，而Zr-4合金在4 h就出现疖状腐蚀；在400℃腐蚀 245 d后，N18试样的增重低于Zr-4，而N36的增重高于Zr-4；在360℃含LiOH的高温高压水中腐蚀300 d，两种合金试样的增重只有Zr-4的16%～25%.N18合金不仅在高温高压水中而且在过热蒸汽中都具有优良的抗腐蚀性能.在Zr-Sn系合金中加入适量的Nb，一部分固溶在α -Zr中可以抵抗C、N等杂质对腐蚀性能的有害影响，另一部分形成第二相均匀弥散分布在合金中可明显降低合金在高温水和过热蒸汽(500℃)中的氧化速率.氧化膜/金属界面处的氧化膜生长存在不均匀性，转折后氧化膜的不均匀生长更明显.

关键词 ： Zr-Sn-Nb合金, 腐蚀行为

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

收稿日期: 2001-12-03

ZTFLH:

TG178

通讯作者: 赵文金

Corresponding author: Wenjin Zhao

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引用本文:

赵文金; 苗志; 蒋宏曼 . Zr-Sn-Nb合金的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2002, 22(2): 124-128 .
Wenjin Zhao, Zhi Miao, Hongman Jiang. CORROSION BEHAVIOR OF Zr-Sn-Nb ALLOY. J Chin Soc Corr Pro, 2002, 22(2): 124-128 .

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2002/V22/I2/124

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