The corrosion of Co-15 wt.% Y at 600-800 degrees C in sulfidizing-oxidizing atmospheres

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	The corrosion of Co-15 wt.% Y at 600-800 degrees C in sulfidizing-oxidizing atmospheres
	Y. Niu; F. Gesmundo; Y. S. Li
	1999
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	51 期号:5-6 页码:421-447
摘要	The corrosion of Co-15 wt.% Y has been studied at 600-800 degrees C in H-2-H2S-CO2 mixtures providing a sulfur pressure of 10(-8) atm at 600-800 degrees C and of 10(-7)atm at 800 degrees C and an oxygen pressure of 10(-24)atm at 600 degrees C and of 10(-20)atm at 700-800 degrees C. The corrosion rates in such sulfidizing-oxidizing atmospheres were compared,,with those of pure cobalt and yttrium. The addition of yttrium to cobalt is only slightly beneficial, since Soi a yttrium content of 15 wt.% the corrosion rate is reduced quite significantly with respect to pure cobalt at 800 degrees C under 10(-7)atm S-2, only to a limited extent at 600 degrees C, and even slightly increased at 700 degrees C. Moreover, the alloy corrodes considerably more rapidly than pure yttrium at 800 degrees C, when the latter. behaves protectively.,At 600 and 700 degrees C, yttrium exhibited breakaway behavior, while the alloy corroded more rapidly than yttrium at short times, but more slowly at long times. Under all conditions, except at 800 degrees C under 10(-8) atm? Sr, the alloy forms ail external layer of cobalt sulfide overlying an intermediate region of very complex composition containing a mixture of the compounds of the two metals and ail innermost region of internal attack containing compounds of yttrium with both oxygen and sulfur. Thus, cobalt can still diffuse through the intermediate region to form the outer cobalt-sulfide layer at nonnegligible rates. The scaling behavior of rite Co-15% Y alloy is discussed by taking into account the limited solubility of yttrium in cobalt as well as the presence of an intermetallic Co-Y compound in the alloy.
部门归属	inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china. univ genoa, ist chim, i-16129 genoa, italy.;niu, y (reprint author), inst corros & protect met, state key lab corros & protect, wencui rd 62, shenyang 110015, peoples r china
关键词	Cobalt Yttrium Two-phase Alloys Sulfidation Oxidation High-temperature Sulfidation 2-phase Binary-alloys Most-reactive Component Ni-nb Alloys Internal Oxidation Oxidant Pressures H2-h2s Mixtures Co Behavior 600-degrees-c-800-degrees-c
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WOS记录号	WOS:000079686800005
引用统计	被引频次：2[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/321006/37460
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Niu,F. Gesmundo,Y. S. Li. The corrosion of Co-15 wt.% Y at 600-800 degrees C in sulfidizing-oxidizing atmospheres[J]. Oxidation of Metals,1999,51(5-6):421-447.
APA	Y. Niu,F. Gesmundo,&Y. S. Li.(1999).The corrosion of Co-15 wt.% Y at 600-800 degrees C in sulfidizing-oxidizing atmospheres.Oxidation of Metals,51(5-6),421-447.
MLA	Y. Niu,et al."The corrosion of Co-15 wt.% Y at 600-800 degrees C in sulfidizing-oxidizing atmospheres".Oxidation of Metals 51.5-6(1999):421-447.