The oxidation of two-phase Cu-Cr alloys under 10(-19) atm O-2 at 700-900 degrees C

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	The oxidation of two-phase Cu-Cr alloys under 10(-19) atm O-2 at 700-900 degrees C
	F. Gesmundo; Y. Niu; F. Viani; D. L. Douglass
	1998
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	49 期号:1-2 页码:147-167
摘要	The oxidation of three Cu-Cr alloys containing 25, 50, and 75 wt.% Cr and having a two-phase microstructure has been studied at 700-900 degrees C in H-2-CO2 mixtures under 10(-19) atm O-2, i.e., below the stability of the copper oxides. At variance with the results obtained by oxidizing the same materials in air, the alloys corroded quite slowly and formed only external chromium-oxide scales rather than showing internal oxidation of chromium. In view of the quite small solubility of chromium in copper, lower than the critical value calculated for the transition from the internal to the external oxidation of chromium, this result is attributed mainly to a supply of chromium from the small Cr-rich particles present in the two-phase eutectic mixture, The corrosion kinetics followed the parabolic rate law to a reasonable approximation, but the rate constants changed rather irregularly as functions of temperature and alloy composition, The scaling rates were generally larger than those measured for pure chromium under the same oxygen pressure, but much smaller than those of the same alloys in air. These results are examined with special reference to the two-phase nature of the alloys.
部门归属	univ genoa, fac ingn, ist chim, i-16129 genoa, italy. inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china. univ arizona, arizona mat lab, tucson, az 85712 usa.;gesmundo, f (reprint author), univ genoa, fac ingn, ist chim, pad d, i-16129 genoa, italy
关键词	Copper Chromium Two-phase Alloys Oxidation Low Oxygen Pressures High-temperature Oxidation 2-phase Binary-alloys Co-nb Alloys Low-oxygen Pressures Most-reactive Component Possible Scaling Modes Low Oxidant Pressures H2-h2s Mixtures 600-800-degrees-c Corrosion
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WOS记录号	WOS:000072410200007
引用统计	被引频次：35[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/321006/37662
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. Gesmundo,Y. Niu,F. Viani,et al. The oxidation of two-phase Cu-Cr alloys under 10(-19) atm O-2 at 700-900 degrees C[J]. Oxidation of Metals,1998,49(1-2):147-167.
APA	F. Gesmundo,Y. Niu,F. Viani,&D. L. Douglass.(1998).The oxidation of two-phase Cu-Cr alloys under 10(-19) atm O-2 at 700-900 degrees C.Oxidation of Metals,49(1-2),147-167.
MLA	F. Gesmundo,et al."The oxidation of two-phase Cu-Cr alloys under 10(-19) atm O-2 at 700-900 degrees C".Oxidation of Metals 49.1-2(1998):147-167.