Oxidation and H2O/NaCl-induced corrosion behavior of sputtered Ni-Si coatings on Ti6A14V at 600-650 degrees C
文献类型：期刊论文
| 作者 | C. Z. Yu ; S. L. Zhu ; D. Z. Wei ; F. H. Wang |
| 刊名 | Surface & Coatings Technology
 |
| 出版日期 | 2007 |
| 卷号 | 201期号:16-17页码:7530-7537 |
| 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 |
| ISSN号 | 0257-8972 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/34002]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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