Oxidation and H2O/NaCl-induced corrosion behavior of sputtered Ni-Si coatings on Ti6A14V at 600-650 degrees C

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	Oxidation and H2O/NaCl-induced corrosion behavior of sputtered Ni-Si coatings on Ti6A14V at 600-650 degrees C
	C. Z. Yu; S. L. Zhu; D. Z. Wei; F. H. Wang
	2007
发表期刊	Surface & Coatings Technology
ISSN	0257-8972
卷号	201 期号:16-17 页码:7530-7537
摘要	The oxidation and H2O/NaCl-induced corrosion behaviors of Ti6Al4V with and without Ni-Si coatings were investigated. The Ni-Si coatings were prepared by magnetron sputtering from a Ni3Si target. The isothermal oxidation tests were performed at 650 degrees C for 100 h in ambient air, while the corrosion experiments were carried out at 600 degrees C for 10 h in O-2/H2O mixture with NaCl deposit on the specimens. The as-sputtered coating was characterized using SEM (scanning electron microscopy) and XRD (X-ray diffraction). The specimens after oxidation/ corrosion tests were studied using SEM/EDS (energy-dispersive spectrometry), XRD, EPMA (electron probe microanalysis) and XPS (X-ray photoelectron spectroscopy). The as-sputtered coating was dual-phase mixture of Ni5Si2 and f.c.c. Ni, which transformed into ordered Ni3Si during oxidation or corrosion. The Ni-Si coatings possessed excellent oxidation and corrosion resistances and eliminated the corrosion-induced crack which was observed in the uncoated Ti6Al4V specimens after 10 h of corrosion. External NiO scales along with amorphous silica precipitates formed on the coating surfaces during oxidation. It is suggested that the formation of silica involves into the oxidation of Ni-Si, disturbs the growth of NiO scale and leads the kinetics deviate from the parabolic law. In the case of H2O/NaCl-induced corrosion, external oxide scale on the coating surface, as well as internal oxide at the columnar boundaries of the coatings and at the coating/substrate interface, was observed. The external scales showed alternative lamellar structures, which consisted of lamellae of NiO, amorphous silica and metallic Ni, might result from the combination effects of multi-step reactions between Ni and NaCl/H2O/O-2, the low diffusivity of Ni3Si and a displacement reaction between Si and NiO. (C) 2007 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ne univ, sch resource, shenyang 110004, peoples r china. ne univ, civil engn coll, shenyang 110004, peoples r china.;zhu, sl (reprint author), chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china;slzhu@imr.ac.cn
关键词	Ni-si Coating Oxidation Corrosion Water Vapor Nacl Deposit High Temperature Solid Nacl Deposit Plus Water-vapor Titanium-alloy Air Oxidation Composite Coatings Ti-6al-4v Alloy Ti6al4v Alloy Resistance Cr Hydrogen
URL	查看原文
WOS记录号	WOS:000246509800081
引用统计	被引频次：30[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/321006/34002
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Z. Yu,S. L. Zhu,D. Z. Wei,et al. Oxidation and H2O/NaCl-induced corrosion behavior of sputtered Ni-Si coatings on Ti6A14V at 600-650 degrees C[J]. Surface & Coatings Technology,2007,201(16-17):7530-7537.
APA	C. Z. Yu,S. L. Zhu,D. Z. Wei,&F. H. Wang.(2007).Oxidation and H2O/NaCl-induced corrosion behavior of sputtered Ni-Si coatings on Ti6A14V at 600-650 degrees C.Surface & Coatings Technology,201(16-17),7530-7537.
MLA	C. Z. Yu,et al."Oxidation and H2O/NaCl-induced corrosion behavior of sputtered Ni-Si coatings on Ti6A14V at 600-650 degrees C".Surface & Coatings Technology 201.16-17(2007):7530-7537.