The oxidation of a Co-15 wt%Y alloy under low oxygen pressures at 600-800 degrees C

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	The oxidation of a Co-15 wt%Y alloy under low oxygen pressures at 600-800 degrees C
	W. T. Wu; R. Y. Yan; Y. Niu; F. Gesmundo
	1997
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	39 期号:10-11 页码:1831-1843
摘要	The corrosion of pure yttrium and of a cobalt alloy containing approximately 15 wt% yttrium was studied at 600-800 degrees C in H-2-CO2 mixtures providing an equilibrium oxygen pressure of 10(-24) atm at 600 degrees C and 10(-20) atm at 700 and 800 degrees C. The corrosion of yttrium under these low oxygen pressures resulted in the growth of Y2O3 scales which was rather protective at 800 degrees C, presenting two approximately parabolic stages with a smaller rate Constant at longer times, but non-protective and faster at lower temperature. The oxidation of Co-15Y was rather irregular under all conditions, but generally slow: in particular, at 800 degrees C the rate decreased almost to zero after about 17 h oxidation. The oxidation of this alloy produced a thin external layer of pure cobalt metal overlying a region of internal oxidation, where the Y-rich phase was transformed into a mixture of cobalt metal and yttrium oxide. The microstructure of the internal oxidation region followed closely that of the original alloy, while no yttrium depletion was observed beneath the front of internal oxidation. These results are examined by taking into account the low solubility of Y in Co and the existence of an intermetallic compound in the alloy. (C) 1997 Elsevier Science Ltd.
部门归属	acad sinica, inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china. univ genoa, fac ingn, ist chim, i-16129 genoa, italy.;wu, wt (reprint author), acad sinica, inst corros & protect met, state key lab corros & protect, wencui rd 62, shenyang 110015, peoples r china
关键词	Cobalt Yttrium Alloys Internal Oxidation 2-phase Binary-alloys High-temperature Oxidation Most-reactive Component Possible Scaling Modes Low Oxidant Pressures Internal Oxidation A/o Al Corrosion 1173-k
URL	查看原文
WOS记录号	WOS:000071426300006
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38148
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. T. Wu,R. Y. Yan,Y. Niu,et al. The oxidation of a Co-15 wt%Y alloy under low oxygen pressures at 600-800 degrees C[J]. Corrosion Science,1997,39(10-11):1831-1843.
APA	W. T. Wu,R. Y. Yan,Y. Niu,&F. Gesmundo.(1997).The oxidation of a Co-15 wt%Y alloy under low oxygen pressures at 600-800 degrees C.Corrosion Science,39(10-11),1831-1843.
MLA	W. T. Wu,et al."The oxidation of a Co-15 wt%Y alloy under low oxygen pressures at 600-800 degrees C".Corrosion Science 39.10-11(1997):1831-1843.