检索结果-南通市图书馆

Analysis of Surface Oxide Films Formed in Hydrogenated Primary Water on Alloy 690TT Samples With Different Surface States

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第12期30卷 1181-1192页

作者： Zhiming Zhang Jianqiu Wang En-Hou Han Wei Ke Key Laboratory of Nuclear Materials and safety assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials Institute of Metal Research Chinese Academy of Sciences

Oxidation of Alloy 690 TT samples either manually ground to 400 and 1500 grit, mechanically polished, or electropolished was performed in a solution of 1500 10 6B and 2.3 10 6Li with 2.5 10 6dissolved H2, at 325℃ and 15.6 MPa for 60 days. The oxide films grown on samples with different surface states were analyzed using various techniques. Results show that a triple-layered structure was formed after immersion： an outermost layer with large scattered oxide particles rich in Fe and Ni, an intermediate layer with small compact oxide particles rich in Cr and Fe for the ground surfaces and loose needle-like oxides rich in Ni for the polished surfaces, and an inner layer with continuous Cr-rich oxides. The surface state was found to affect not only the surface morphology, but also the corrosion rate. Grinding accelerated the growth of protective oxide films such that the ground samples showed a lower oxidation rate than the polished *** of ground Alloy 690 TT showed superior resistance to intergranular attack（IGA）.

关键词： Alloy 690TT Oxidation Surface states High pressure and high temperature

Oxidation and Electrochemical Behavior of MonolayerGraphene-Coated Copper in Simulated Primary Water

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第1期29卷 89-93页

作者： Hong-Liang Ming Si-Yan Wang Zhi-Ming Zhang Jian-Qiu Wang En-Hou Han Wei Ke Key Laboratory of Nuclear Materials and safety assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of Sciences

In high-temperature and high-pressure water, traditional anticorrosion approaches are not suitable to be used to protect structural materials from oxidation and corrosion. In this study, monolayer graphene was explored as a barrier to protect the materials from degradation. The oxidation and corrosion rate of the monolayer-graphene-coated copper is much lower than that of the bare copper, suggesting that the monolayer graphene can effectively protect the copper from oxidation and corrosion in the simulated primary water of pressurized water reactors.

关键词： Monolayer graphene Oxidation behavior Electrochemical behavior Simulated primarywater

Transferred Monolayer Graphene as a Potential Anti-Oxidation Barrier for Alloy 690TT in Simulated Primary Water

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第12期31卷 1171-1174页

作者： Hongliang Ming Siyan Wang Zhiming Zhang Jianqiu Wang En-Hou Han Wei Ke Key Laboratory of Nuclear Materials and safety assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of Sciences

To explore the usage of monolayer graphene as an anti-oxidation barrier in simulated primary water of pressurized water reactors（PWRs）,we transferred the monolayer graphene synthesized by low pressure chemical vapor deposition（LPCVD） on Cu foil to Alloy 690 *** a 500 h immersion,strong oxidation resistance was obtained from the graphene coated Alloy 690 TT sample,indicating that the transferred monolayer graphene can act as an effective barrier to protect the substrate from oxidation in simulated primary water of PWRs.

关键词： Graphene Oxidation 690TT Simulated primary water

Pitting corrosion of a Rare Earth Mg alloy GW93

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第9期33卷 954-960页

作者： Yingwei Song Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and safety assessment Institute of Metal ResearchChinese Academy of Sciences

Pitting corrosion of magnesium(Mg) alloys is greatly associated with their microstructure, especially second phases. The second phases in traditional Mg alloys such as AZ91 are electrochemically nobler than Mg matrix, while the second phases in Rare earth(RE) Mg alloy GW93 are more active than Mg matrix. As a result, the pitting corrosion mechanism of Mg alloy GW93 is different from the traditional ones. This paper aims to clarify the pitting corrosion mechanism of Mg alloy GW93 through the studies of Volta potential by Scanning Kelvin Probe Force Microscopy(SKPFM), corrosion morphology by Scanning Electron Microscope(SEM), and corrosion resistance by electrochemical tests. Results reveal that the pitting corrosion of GW93 includes three stages, first, dissolution of the second phases, followed by corrosion of Mg matrix adjacent to the dissolved second phases, and finally, propagation of corrosion pits along the depth direction of the dissolved second phases. Anodic second phases and enrichment of Clin the thick corrosion product films dominate the propagation of pitting corrosion.

关键词： Mg alloys Pitting corrosion Second phases Oxide films

Characteristics of Oxidation and Oxygen Penetration of Alloy 690 in 600°C Aerated Supercritical Water

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第3期34卷 561-569页

作者： Xiangyu Zhong Xinqiang Wu En-Hou Han CAS Key Laboratory of Nuclear Materials and safety assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The oxide films formed on Alloy 690 exposed to 600 ℃ supercritical water were characterized using mass measurement, X-ray diffraction. Raman spectroscopy, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. It was found that the mass gain of the alloy in supercritical water decreased with increasing exposure time. The oxide films have a double-layer structure, with an inner layer rich in Cr and outer layer rich in Ni and Fe after short time and long time exposure. The penetration of the oxide along the grain boundaries was observed, and the penetration depth increased with increasing exposure time. The grain boundaries and voids are the short-path of oxygen diffusion into the metal.

关键词： Ni-based alloy XPS Supercritical water High temperature corrosion High temperature oxidation Oxide film

Influence of Conductivity on Corrosion Behavior of 304 Stainless Steel in High Temperature Aqueous Environment

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2016年第4期32卷 333-340页

作者： Jiazhen Wang Jianqiu Wang En-Hou Han Key Laboratory of Nuclear Materials and safety assessment Institute of Metal Research Chinese Academy of Sciences

The influence of conductivity on corrosion behavior of 304 stainless steel （SS） in high temperature water was investigated by using in-situ potentiodynamic polarization curves, electrochemical impedance spectra （EIS） at 300 ℃, and ex-situ scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and X-ray pho- toelectron spectroscopy （XPS）. The structures of oxide films formed on 304 SS change with different conductivities at 300 ℃. With the increase in conductivity, the passive current density increases while the resistances of oxide films decrease. But the resistances do not decrease lineally with the increase in conductivity. A modified double-layer model for oxide structure was proposed to explain the influence mechanism of conductivity on the oxide films on 304 SS in high temperature water. Improving the 10B enrichment level can reduce the conductivity of primary water and increase the corrosion resistance of 304 SS.

关键词： Stainless steelPolarizationElectrochemical impedance spectraHigh temperature corrosion

Influence of Ethanolamine on Corrosion of Alloy 690 in Simulated Secondary Water

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第10期31卷 1039-1046页

作者： Jiazhen Wang Jianqiu Wang Key Laboratory of Nuclear Materials and safety assessment Institute of Metal ResearchChinese Academy of Sciences

Effect of ethanolamine （ETA） on Alloy 690 in simulated pressurized water reactor （PWR） secondary cooling water was studied by electrochemical impedance spectroscopy （EIS）, potentiodynamic polarization, atomic force microscopy （AFM）, Fourier transform infrared spectroscopy-attenuated total reflectance （FTIR-ATR）, X-ray photoelectron spectrometer （XPS） and time of flight secondary ion mass spectrometry （ToF-SIMS）. The results show that moderate addition of ETA can enhance the corrosion resistance of Alloy 690 in high-temperature pressurized water and the optimum additive value is 2 mg/L. The addition of ETA contributes to the formation of oxide rather than hydroxide in the film on the surface of Alloy 690. The corrosion resistance of Alloy 690 at 320 ℃ with the addition of ETA is better than that at 280 ℃.

关键词： Ethanolamine (ETA)Alloy 690High-temperature electrochemistry Oxide film

Multilayer Graphene:A Potential Anti-oxidation Barrier in Simulated Primary Water

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第11期30卷 1084-1087页

作者： Hongliang Ming Jianqiu Wang Zhiming Zhang Siyan Wang En-Hou Han Wei Ke Key Laboratory of Nuclear Materials and safety assessment Institute of Metal ResearchChinese Academy of Sciences

Multilayer graphene as a potential anti-oxidation barrier to protect nickel foils from oxidation was studied in simulated primary water of pressurized water reactors （PWRs）. The results show that after immersion for 1000 h, the structure of the multilayer graphene remains unchanged and no obvious oxide film formed on the graphene coated nickel foils, indicating multilayer graphene can effectively act as the anti-oxidation barrier to protect the substrate from oxidation and hence can improve the heat transfer efficiency of the substrate in simulated primary water of PWRs.

关键词： Graphene Raman spectroscopy X-ray photoelectron spectroscopy Anti-oxidation barrier Simulated primary water

Correlation Between Microstructure and Corrosion Behavior of Two 90Cu10Ni Alloy Tubes

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 730-738页

作者： Aili Ma Shengli Jiang Yugui Zheng Zhiming Yao Wei Ke Shuang Xia Key Laboratory of Nuclear Materials and safety assessment Institute of Metal ResearchChinese Academy of Sciences institute of Materials Shanghai University

Two kinds of 90Cu10 Ni tubes with different service lives（more than 3 years and only 1 year,respectively）under identical working conditions were studied by an immersion test in a 3.5 wt% NaCl solution and the electron backscattered diffraction（EBSD） *** morphology after immersion showed severer corrosion attack at the grain boundaries of the tube with shorter service life compared with the tube with longer service *** grain boundary characterization distributions（GBCDs） of the two tubes obtained by EBSD revealed more Σ3 boundaries and twins,and larger random boundary meshes in the tube with longer service life.A short immersion test in a modified Livingston＇s solution was conducted to evaluate the tendency to corrosion attack of different types of the grain *** and AFM were used to characterize the corrosion morphologies of the boundaries.A strong correlation between varying depths of corrosion grooves and types of the grain boundaries was *** influence of deviation angle of low Σ boundaries on corrosion resistance of the grain boundaries was also *** is concluded that a special ‘‘grain boundary engineering＇＇（GBE） treatment has been performed on the tube with longer service *** is proposed that the optimized GBCD is responsible for the better service performance of the tube.

关键词： 90Cu10Ni alloy Corrosion resistance Grain boundary Twin Σ3 boundary Electron backscattered diffraction