Effect of Pre-oxidation on Carburisation and Metal Dusting of Nano-crystalline Ni-Cr Alloys

IMR OpenIR

	Effect of Pre-oxidation on Carburisation and Metal Dusting of Nano-crystalline Ni-Cr Alloys
	Z. Xiang; J. Q. Zhang; C. H. Kong; X. Peng
	2014
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	81 期号:5-6 页码:645-660
摘要	Nanocrystalline (NC) Ni-Cr coatings, containing 5, 10 and 20 wt% Cr were prepared using magnetron sputtering deposition, on the substrates of the same composition materials. These alloys were tested in 47 %CO-47 %H-2-6 %H2O for 50 h at 650 A degrees C. Weight gain kinetics showed that increasing Cr content decreased the carburisation kinetics. After reaction, the NC coatings containing high Cr (10 and 20 wt%) remained, with the formation of surface and inner Cr2O3 and internal precipitates of fine carbon deposits for Ni-10Cr and Cr7C3 for Ni-20Cr. In contrast, the Ni-5Cr coated sample suffered a severe metal dusting with whole coating scale was destroyed completely. Preoxidation of these alloys and their miro-grained counterparts was conducted before metal dusting. It was found that preoxidation significantly reduced weight gain kinetics. This reduction effect is more significant for NC Ni-Cr alloys than the micro-grained alloys. The critical chromium concentration for protective chromia scale formation and for internal chromium carbide formation were discussed using Wagner's analysis and product solubility calculation, respectively. The effects of preoxidation and grain size on oxide formation and carburisation/metal dusting were also discussed.
部门归属	[xiang, zheng ; zhang, jianqiang] univ new s wales, sch mat sci & engn, sydney, nsw 2052, australia. [kong, chunhua] univ new s wales, mark wainwright analyt ctr, sydney, nsw 2052, australia. [peng, xiao] acad sinica, inst met res, state key lab corros & protect, shenyang 110015, peoples r china. ; zhang, jq (reprint author), univ new s wales, sch mat sci & engn, sydney, nsw 2052, australia. ; j.q.zhang@unsw.edu.au
关键词	Nanocrystalline Ni-cr Oxidation Carburisation Metal Dusting Co-h-2-h2o Gas-mixtures Base Alloys Fe-base Oxidation Nickel Resistance Mechanism Coatings Behavior Iron
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72941
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Xiang,J. Q. Zhang,C. H. Kong,et al. Effect of Pre-oxidation on Carburisation and Metal Dusting of Nano-crystalline Ni-Cr Alloys[J]. Oxidation of Metals,2014,81(5-6):645-660.
APA	Z. Xiang,J. Q. Zhang,C. H. Kong,&X. Peng.(2014).Effect of Pre-oxidation on Carburisation and Metal Dusting of Nano-crystalline Ni-Cr Alloys.Oxidation of Metals,81(5-6),645-660.
MLA	Z. Xiang,et al."Effect of Pre-oxidation on Carburisation and Metal Dusting of Nano-crystalline Ni-Cr Alloys".Oxidation of Metals 81.5-6(2014):645-660.