The formation of two layers in the internal oxidation of binary alloys by two oxidants in the absence of external scales

IMR OpenIR

	The formation of two layers in the internal oxidation of binary alloys by two oxidants in the absence of external scales
	Gesmundo, F ; Niu, Y
通讯作者	Gesmundo, F()
	1999-02-01
发表期刊	OXIDATION OF METALS
ISSN	0030-770X
卷号	51 期号:1-2 页码:129-158
摘要	An improved treatment of the simultaneous internal oxidation of binary solid-solution alloys by two different oxidants (double internal oxidation) producing two subsequent layers divided by a sharp planar interface in the absence of external scales of the most-noble component has been developed by removing some of the approximations involved in previous theories. The kinetics of internal oxidation are calculated, based on the assumption that all the partial processes follow the parabolic rate law, as expected for diffusion-controlled processes. The overall thickness of internal oxidation for dual oxidants is found to be equal to or smaller than the sum of those produced by the two oxidants taken separately under the same experimental conditions. The ratio between the thickness of the two regions depends critically on the ratio between the diffusion coefficients of the two oxidants, so that under appropriate limiting conditions, one of the two layers becomes negligible. The degree of enrichment of the most-reactive component in the region of internal oxidation by two oxidants is found to be uniform over the whole zone, but lower than what would be produced by each of the oxidants taken singularly. The theoretical predictions are then compared to some experimental results. It is finally shown that the external layer will not contain the compound most stable on an absolute scale, but that most stable with respect to the actual composition of the gas phase, while scaling structures different from that assumed here are also possible.
关键词	binary alloys internal oxidation two oxidants
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000079260500007
出版者	KLUWER ACADEMIC/PLENUM PUBL
引用统计	被引频次：26[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/321006/108976
专题	中国科学院金属研究所
通讯作者	Gesmundo, F
作者单位	1.Univ Genoa, Fac Ingn, Ist Chim, I-16129 Genoa, Italy 2.Inst Corros & Protect Met, State Key Lab Corros, Shenyang 110015, Peoples R China
推荐引用方式 GB/T 7714	Gesmundo, F,Niu, Y. The formation of two layers in the internal oxidation of binary alloys by two oxidants in the absence of external scales[J]. OXIDATION OF METALS,1999,51(1-2):129-158.
APA	Gesmundo, F,&Niu, Y.(1999).The formation of two layers in the internal oxidation of binary alloys by two oxidants in the absence of external scales.OXIDATION OF METALS,51(1-2),129-158.
MLA	Gesmundo, F,et al."The formation of two layers in the internal oxidation of binary alloys by two oxidants in the absence of external scales".OXIDATION OF METALS 51.1-2(1999):129-158.