CORROSION BEHAVIOR OF Zr(Fex, Cr1-x)2 ALLOYS IN 400 °C SUPERHEATED STEAM

被引：17

作者：

Cao Xiaoxiao ^{[1
]}

Yao Meiyi ^{[1
]}

Peng Jianchao ^{[2
]}

Zhou Bangxin ^{[1
]}

机构：

[1] Shanghai Univ, Inst Mat, Shanghai 200072, Peoples R China

[2] Shanghai Univ, Lab Microstruct, Shanghai 200444, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2011年 / 47卷 / 07期

基金：

中国国家自然科学基金;

关键词：

zirconium alloy; second phase particle; corrosion; energy filtered TEM; ZIRCONIUM ALLOYS; WATER CHEMISTRY; OXIDE-FILMS; EVOLUTION; OXIDATION; FE;

D O I：

10.3724/SP.J.1037.2011.00251

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

To study the corrosion behavior of second phase particles in zirconium alloys, Zr(Fe-x, Cr1-x)(2) (x = 1, 2/3, 1/3) metallic compounds which have the same composition as the second phase particles in Zr-4 alloy were prepared by vacuum non-consumable arc melting. XRD and energy filtered TEM were employed for analyzing the corrosion products, the element distribution and grain morphology after corrosion tests of Zr(Fe-x, Cr1-x)(2) metallic compounds powder at 400 degrees C and 10.3 MPa superheated steam with different exposure times. The results show that Cr has a very strong effect on the corrosion resistance of Zr(Fe-x, Cr1-x)(2) metallic compounds, increasing Cr content can improve the corrosion resistance. When Zr(Fe-x, Cr1-x)(2) oxidation starts, zirconium oxide is formed while elements Fe and Cr are expelled from the zirconium oxide due to their low solid solubility in the oxide. alpha-Fe(Cr) and gamma-Fe(Cr) are formed and then oxidized to the stable corrosion product (Fe, Cr)(3)O-4. The different corrosion behaviors of metallic compounds will affect the microstructure evolution of zirconium oxide layer differently during the corrosion process, and hence affect the corrosion resistance of zirconium alloys.

引用

页码：882 / 886

页数：5

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