The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C

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	The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C; The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C
	Y. Niu; Z. L. Zhao; F. Gesmundo; M. Al-Omary
	2001 ; 2001
发表期刊	Corrosion Science ; Corrosion Science
ISSN	0010-938X ; 0010-938X
卷号	43 期号:8 页码:1541-1556
摘要	The oxidation of two Cu-Ni-Ag alloys in air has been studied at 600-700 degreesC, Both alloys contain a mixture of a silver-rich phase (alpha) with a second phase mostly composed of a copper-nickel solid solution (beta). Thus, these alloys are ternary two-phase systems containing two reactive metals with different affinity for oxygen plus a noble metal. Under all conditions the two alloys form complex scales containing an outermost layer of copper oxides followed by an inner region composed of a mixture of Cu2O plus NiO With a number of silver metal particles. 4 region of internal oxidation of nickel of the classical type is only observed for Cu-15Ni-15Ag oxidized at 700 degreesC. For Cu-25Ni-25Ag, the particles of the beta phase in the innermost scale region are corroded only around their surface, leaving an unoxidized core surrounded by NiO. A peculiar structure observed for Cu-15SNi-15Ag at 700 degreesC is the presence of CuO beneath a Cu2O layer, which is attributed to a decrease of the oxygen pressure for the Cu2O-CuO equilibrium due to preferential dissolution of NiO in CuO rather than in Cu2O. The oxidation rate of each alloy under constant temperature decreases generally with time and is only approximately parabolic, showing some short periods of accelerated oxidation. For each alloy the rate increases with temperature, while at both temperatures Cu-15Ni-15Ag corrodes more rapidly than Cu-25Ni-25Ag. The scaling rates of the two alloys are substantially similar to those for the oxidation of pure copper, in spite of the presence of silver metal and of NiO in the scales. (C) 2001 Elsevier Science Ltd. All rights reserved.; The oxidation of two Cu-Ni-Ag alloys in air has been studied at 600-700 degreesC, Both alloys contain a mixture of a silver-rich phase (alpha) with a second phase mostly composed of a copper-nickel solid solution (beta). Thus, these alloys are ternary two-phase systems containing two reactive metals with different affinity for oxygen plus a noble metal. Under all conditions the two alloys form complex scales containing an outermost layer of copper oxides followed by an inner region composed of a mixture of Cu2O plus NiO With a number of silver metal particles. 4 region of internal oxidation of nickel of the classical type is only observed for Cu-15Ni-15Ag oxidized at 700 degreesC. For Cu-25Ni-25Ag, the particles of the beta phase in the innermost scale region are corroded only around their surface, leaving an unoxidized core surrounded by NiO. A peculiar structure observed for Cu-15SNi-15Ag at 700 degreesC is the presence of CuO beneath a Cu2O layer, which is attributed to a decrease of the oxygen pressure for the Cu2O-CuO equilibrium due to preferential dissolution of NiO in CuO rather than in Cu2O. The oxidation rate of each alloy under constant temperature decreases generally with time and is only approximately parabolic, showing some short periods of accelerated oxidation. For each alloy the rate increases with temperature, while at both temperatures Cu-15Ni-15Ag corrodes more rapidly than Cu-25Ni-25Ag. The scaling rates of the two alloys are substantially similar to those for the oxidation of pure copper, in spite of the presence of silver metal and of NiO in the scales. (C) 2001 Elsevier Science Ltd. All rights reserved.
部门归属	univ genoa, dipartimento ingn chim & proc, i-16129 genoa, italy. acad sinica, inst met res, state key lab corros & protect, shenyang 110015, peoples r china. univ sharjah, dept basic sci, sharjah, u arab emirates.;gesmundo, f (reprint author), univ genoa, dipartimento ingn chim & proc, pad d, i-16129 genoa, italy ; univ genoa, dipartimento ingn chim & proc, i-16129 genoa, italy. acad sinica, inst met res, state key lab corros & protect, shenyang 110015, peoples r china. univ sharjah, dept basic sci, sharjah, u arab emirates.;gesmundo, f (reprint author), univ genoa, dipartimento ingn chim & proc, pad d, i-16129 genoa, italy
关键词	Copper-nickel-silver Copper-nickel-silver Alloys Alloys Oxidation Oxidation High Temperatures High Temperatures Low-oxygen Pressures Low-oxygen Pressures High-temperature Oxidation High-temperature Oxidation Possible Scaling Possible Scaling Modes Modes High Oxidant Pressures High Oxidant Pressures 2-phase Binary-alloys 2-phase Binary-alloys H-2-h2s Mixtures H-2-h2s Mixtures Cr Alloys Cr Alloys Nb Alloys Nb Alloys 600-800-degrees-c 600-800-degrees-c Sulfidation Sulfidation
URL	查看原文 ; 查看原文
WOS记录号	WOS:000169447700008 ; WOS:000169447700008
引用统计	被引频次：9[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/321006/36764
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Niu,Z. L. Zhao,F. Gesmundo,et al. The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C, The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C[J]. Corrosion Science, Corrosion Science,2001, 2001,43, 43(8):1541-1556, 1541-1556.
APA	Y. Niu,Z. L. Zhao,F. Gesmundo,&M. Al-Omary.(2001).The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C.Corrosion Science,43(8),1541-1556.
MLA	Y. Niu,et al."The air oxidation of two Cu-Ni-Ag alloys at 600-700 degrees C".Corrosion Science 43.8(2001):1541-1556.