Oxidation of two ternary Cu-Ni-20 wt.% Cr alloys at 700-800 degrees C in 1 atm O-2

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	Oxidation of two ternary Cu-Ni-20 wt.% Cr alloys at 700-800 degrees C in 1 atm O-2
	Z. Q. Cao; Y. Niu; F. Gesmundo
	2001
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	56 期号:3-4 页码:287-297
摘要	Two ternary Cu-Ni-Cr alloys containing approximately 20 wt.% chromium, but with a different Cu and Ni content, have been oxidized in 1 atm of pure oxygen at 700-800 degrees C The alloy containing about 60 wt.% nickel (Cu-60Ni-20Cr) was composed of a single solid-solution phase and formed external scales of chromium ocide with an outermost layer containing a mixture of copper and nickel oxides. The alloy comprised of about 40 wt.%nickel (Cu-40Ni-2OCr) contained a mixture of two metal phases and formed complex external scales, containing copper oxide and a nickel-chromium spinel plus a region where islands of the metallic phase richer in chromium surrounded by a thin chromia layer were mixed with oxidized islands rich in copper and nickel, producing a situation out of equilibrium. With time, a very irregular and thin but essentially continuous layer of chromia formed at the base of the mixed internal region for this alloy, producing a gradual decrease of the corrosion rate down to very low values. The oxidation behavior of the two alloys is interpreted in terms of their different microstructure. In particular, the fast initial oxidation of Cu-40Ni-20Cr, associated with the formation of large amounts of copper oxides, is attributed to restrictions in chromium diffusion in the alloy due to the simultaneous presence of two metal phases.
部门归属	inst met sci & technol, state key lab corros & protect, new delhi 110016, india. liaoning univ, dept sci & chem engn, shenyang 110036, peoples r china.;cao, zq (reprint author), inst met sci & technol, state key lab corros & protect, weneui rd,62, new delhi 110016, india
关键词	Copper Nickel Chromium Alloys Oxidation 2-phase Binary-alloys High-temperature Oxidation Most-reactive Component Possible Scaling Modes High Oxidant Pressures Fe-cu Alloys Air Oxidation Internal Oxidation Stable Oxide Corrosion
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36602
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Q. Cao,Y. Niu,F. Gesmundo. Oxidation of two ternary Cu-Ni-20 wt.% Cr alloys at 700-800 degrees C in 1 atm O-2[J]. Oxidation of Metals,2001,56(3-4):287-297.
APA	Z. Q. Cao,Y. Niu,&F. Gesmundo.(2001).Oxidation of two ternary Cu-Ni-20 wt.% Cr alloys at 700-800 degrees C in 1 atm O-2.Oxidation of Metals,56(3-4),287-297.
MLA	Z. Q. Cao,et al."Oxidation of two ternary Cu-Ni-20 wt.% Cr alloys at 700-800 degrees C in 1 atm O-2".Oxidation of Metals 56.3-4(2001):287-297.