The sulphidation of copper-rich Cu-Ag alloys in H-2-H2S at 550-750 degrees C

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	The sulphidation of copper-rich Cu-Ag alloys in H-2-H2S at 550-750 degrees C
	P. Castello; Y. Niu; F. Gesmundo
	1999
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	41 期号:5 页码:919-939
摘要	The sulphidation of two copper-silver alloys containing 5 and 10 wt.% silver (Cu-5Ag and Cu-10Ag, respectively) was investigated over the temperature range 550-750 degrees C in H-2/H2S mixtures under sulphur pressures below the dissociation of Ag2S. External scales, composed mainly of cuprous sulphide, often containing some (Cu,Ag)(2-x)S islands, formed on both alloys. The corrosion kinetics were significantly affected by the detachment of the outer scales at temperature, as a consequence of the significant volume increase due to sulphidation. After scale detachment, sulphidation proceeded through a dissociative transport of sulphur in voids between the outer sulphide layer and the alloy substrate, yielding an abrupt decrease of the corrosion rate in all cases and modifying the composition of the reaction products in the case of Cu-10Ag. An increase of the volume fraction of the silver-rich solid solution in the subscale region with respect to the original alloy was observed in all cases. The silver islands coalesced to a continuous subscale layer only in the sulphidation of Cu-5Ag at 650 and 750 degrees whereas, in all the other cases, they remained as particles in a Cu2S matrix. The peculiar corrosion behaviour of these alloys is attributed to the low solubility of silver in copper. (C) 1999 Elsevier Science Ltd. All rights reserved.
部门归属	univ genoa, fac ingn, ist chim, i-16129 genoa, italy. acad sinica, inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china.;gesmundo, f (reprint author), univ genoa, fac ingn, ist chim, fiera mare,pad d, i-16129 genoa, italy;gesmundo@unige.it
关键词	Sulphidation Copper Silver Two-phase Alloys State Corrosion Kinetics 2-phase Binary-alloys Most-stable Oxide Internal Oxidation
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WOS记录号	WOS:000079400300006
引用统计	被引频次：6[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/321006/37309
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. Castello,Y. Niu,F. Gesmundo. The sulphidation of copper-rich Cu-Ag alloys in H-2-H2S at 550-750 degrees C[J]. Corrosion Science,1999,41(5):919-939.
APA	P. Castello,Y. Niu,&F. Gesmundo.(1999).The sulphidation of copper-rich Cu-Ag alloys in H-2-H2S at 550-750 degrees C.Corrosion Science,41(5),919-939.
MLA	P. Castello,et al."The sulphidation of copper-rich Cu-Ag alloys in H-2-H2S at 550-750 degrees C".Corrosion Science 41.5(1999):919-939.