Analysis of Oxides Formed on the Surface of the Alloy 690 in Hydrogenated Supercritical Water
来源期刊：Acta Metallurgica Sinica2016年第8期
论文作者：Jin Gao Fa-rong Wan Guo-ping Cao Kumar Sridharan Todd Allen
文章页码：774 - 781
摘 要：The oxides formed on the surface of the alloy 690 in hydrogenated supercritical water at 400℃ for 1000 h were investigated using scanning electron microscopy,transmission electron microscopy,scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy.The oxides on me surface of the alloy 690 exhibited multi-layer structure:an outer layer consisted of granular crystallites（NiO and NiFe2O4） and a compact inner layer（spinel and Cr2O3）.Chemical analysis indicated that the outer layer was enriched in nickel but depleted in chromium,whereas the inner layer was enriched in chromium and iron but depleted in nickel.The inner layer was also characterized as layered structure by Fe-rich spinel on top of continuous Cr2O3 layer.Besides,Cr2O3 nodules were readily observed at the oxides/alloy interface.
Jin Gao1，Fa-rong Wan1，Guo-ping Cao2，Kumar Sridharan2，Todd Allen2
1. School of Materials Science and Engineering,University of Science and Technology Beijing2. Department of Materials Science and Engineering,University of Wisconsin-Madison
摘 要：The oxides formed on the surface of the alloy 690 in hydrogenated supercritical water at 400℃ for 1000 h were investigated using scanning electron microscopy,transmission electron microscopy,scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy.The oxides on me surface of the alloy 690 exhibited multi-layer structure:an outer layer consisted of granular crystallites（NiO and NiFe2O4） and a compact inner layer（spinel and Cr2O3）.Chemical analysis indicated that the outer layer was enriched in nickel but depleted in chromium,whereas the inner layer was enriched in chromium and iron but depleted in nickel.The inner layer was also characterized as layered structure by Fe-rich spinel on top of continuous Cr2O3 layer.Besides,Cr2O3 nodules were readily observed at the oxides/alloy interface.
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