|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
|Source Publication||Oxidation of Metals
|Abstract||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.|
; 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.
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.
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.
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.
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