The sulfidation of a Co-15 wt.% Ce alloy in H-2-H2S mixture at 600-800 degrees C

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	The sulfidation of a Co-15 wt.% Ce alloy in H-2-H2S mixture at 600-800 degrees C
	P. Castello; G. Y. Fu; Y. Niu; F. Gesmundo; F. Viani
	1998
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	49 期号:1-2 页码:71-89
摘要	The sulfidation behavior of a Co-Ce alloy containing approximately 15 wt.% Ce has been studied at 600-800 degrees C in H-2-H2S mixtures providing a sulfur pressure of 10(-8) atm, but also of 10(-7) atm at 800 degrees C. At 600 and 700 degrees C the alloy corrodes more slowly than pure cobalt, but more rapidly than pure cerium. At 800 degrees C under 10(-8) atm S-2, which is below the stability of the cobalt sulfides, the alloy corrodes quite slowly, bur under 10(-7) atm S-2 it corrodes very rapidly and practically at the same rate as pure cobalt. The sulfidation kinetics are generally il regular, except for a few cases of nearly parabolic behavior. The sulfidation of the alloy produces duplex scales, containing an outermost layer of practically pure cobalt sulfide and an inner complex layer where the two components are simultaneously present. Cerium is not able to diffuse out of the alloy-consumption region, where it forms a cerium sulfide mixed with cobalt sulfide and an innermost region where cerium sulfide is mixed with cobalt metal. The cobalt sulfide forms a continuous network which allows the growth of the external CoSy layer, even though at rates reduced with respect to pure cobalt. Thus, a cerium content of 15 wt.% is not sufficient to prevent the sulfidation of the base metal. These results as well as the details of the microstructure of the scales grown on the alloy are interpreted by taking into account the limited solubility of cerium in the base metal and the presence in the alloy of an intermetallic compound rich in cerium.
部门归属	univ genoa, fac ingn, ist chim, i-16129 genoa, italy. acad sinica, inst corros & protect, state key lab corros & protect, shenyang 110015, peoples r china. shenyang inst chem engn, shenyang 110021, peoples r china.;castello, p (reprint author), univ genoa, fac ingn, ist chim, pad d, i-16129 genoa, italy
关键词	Cobalt Cerium Sulfidation High-temperature Sulfidation 2-phase Binary-alloys Low Oxidant Pressures Fe-nb Alloys Internal Oxidation H2-h2s Mixtures Mo Alloys 600-degrees-c-800-degrees-c Corrosion Ni
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WOS记录号	WOS:000072410200004
引用统计	被引频次：7[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/321006/37628
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. Castello,G. Y. Fu,Y. Niu,et al. The sulfidation of a Co-15 wt.% Ce alloy in H-2-H2S mixture at 600-800 degrees C[J]. Oxidation of Metals,1998,49(1-2):71-89.
APA	P. Castello,G. Y. Fu,Y. Niu,F. Gesmundo,&F. Viani.(1998).The sulfidation of a Co-15 wt.% Ce alloy in H-2-H2S mixture at 600-800 degrees C.Oxidation of Metals,49(1-2),71-89.
MLA	P. Castello,et al."The sulfidation of a Co-15 wt.% Ce alloy in H-2-H2S mixture at 600-800 degrees C".Oxidation of Metals 49.1-2(1998):71-89.