The oxidation of two Fe-Ce alloys under low oxygen pressures at 600-800 degrees C

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	The oxidation of two Fe-Ce alloys under low oxygen pressures at 600-800 degrees C
	Y. Niu; G. Y. Fu; W. T. Wu; F. Gesmundo
	1999
发表期刊	High Temperature Materials and Processes
ISSN	0334-6455
卷号	18 期号:3 页码:159-172
摘要	The corrosion of pure cerium and of two iron-based alloys containing approximately 15 and 30 wt% cerium was studied at 600-800 degrees C in H-2-CO2 mixtures providing at equilibrium oxygen pressure of 10(-24) atm at 600 degrees C and 10(-20) atm at 700 and 800 degrees C. The corrosion of the two alloys produced an internal attack, which transformed the cerium-rich phases into mixtures of iron metal and cerium-rich oxides, including a double Fe-Ce oxide as well as CeO2. The rate of internal oxidation was much faster than expected on the basis of the solubility/diffusivity of oxygen in iron, especially for Fe-30Ce, for which oxygen penetration probably occurs mainly through microcracks produced by the large mechanical stresses associated with the local volume increase. The microstructures of the regions of internal oxidation followed closely those of the original alloys, while no cerium depletion was observed in the metal substrate. At 600 and 700 degrees C some iron oxide formed on the alloy surface, while at 800 degrees C a thin layer of pure iron metal formed on the surface of Fe-30Ce, These results are examined by taking into account the low solubility of cerium in iron and the presence of intermetallic compounds in the two alloys.
部门归属	cas, inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china. shenyang inst chem technol, shenyang 110021, peoples r china. univ genoa, fac ingn, ist chim, i-16129 genoa, italy.;niu, y (reprint author), cas, inst corros & protect met, state key lab corros & protect, wencui rd 62, shenyang 110015, peoples r china
关键词	Iron Cerium Alloys Oxidation Internal Attack 2-phase Binary-alloys High-temperature Oxidation Most-reactive Component Possible Scaling Modes Low Oxidant Pressures Internal Oxidation Nb Alloys Corrosion
URL	查看原文
WOS记录号	WOS:000079489600006
引用统计	被引频次：11[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/321006/37459
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Niu,G. Y. Fu,W. T. Wu,et al. The oxidation of two Fe-Ce alloys under low oxygen pressures at 600-800 degrees C[J]. High Temperature Materials and Processes,1999,18(3):159-172.
APA	Y. Niu,G. Y. Fu,W. T. Wu,&F. Gesmundo.(1999).The oxidation of two Fe-Ce alloys under low oxygen pressures at 600-800 degrees C.High Temperature Materials and Processes,18(3),159-172.
MLA	Y. Niu,et al."The oxidation of two Fe-Ce alloys under low oxygen pressures at 600-800 degrees C".High Temperature Materials and Processes 18.3(1999):159-172.