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Rheological behaviour of semi-solid succinonitrile-camphor alloy

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Journal of University of Science and Technology Beijing 2003年第1期10卷 25-29页

作者： Zhenyao Wangstate key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110016, china Lab. for corrosion and protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Rheology experiments were carried out on succinonitrile-4% (mass fraction) camphor alloy, using a Haake VT550 viscometer. The results showed that the steady state viscosity of succinonitrile-4% camphor alloy in semi-solid process can be described well by the classical power law of viscosity versus shear rate, η= kγm, and the test method can be used to simulate the semi-solid processing for metals. The viscosity of the organic alloy decreases with increasing shear rate at a given temperature within liquid-solid range, and the viscosity of the organic alloy slurries increases with decreasing temperature, decreases with decreasing cooling rate. The structure and viscosity of organic alloy during solidification are strongly influenced by shear rate.

关键词： rheology semi-solid processing viscosity organic alloy microstructure

Electrochemical corrosion Behavior of Nanocrystalline Materials-a Review

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Journal of Materials Science & Technology 2010年第1期26卷 1-14页

作者： Li Liu, Ying Li and Fuhui Wang state key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110016, china state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Nanocrystallization significantly influences the electrochemical corrosion behaviors of metals/alloys in liquid system. In active dissolution, nanocrystallization accelerates the corrosion reactions. If the corrosion products are dissoluble, the corrosion rate is increased by nanocrystallization; if the corrosion products are insoluble, the corrosion rate is decreased on the contrary because the corrosion products act as a block layer to delay the dissolution. In passivation, nanocrystallization changes the composition of the passive film, and results into different morphology and growth process of the passive film, both of which improves the formation of compact film and influences the semiconductor property. It influences the passivation depending on fast element diffusion and special adsorbed ability. The small grain size improves the element diffusion, which leads to the different composition of passive film （passive elements enrichment such as Cr, Ti）. The small grain size also changes the surface condition, which influences the ions adsorption. All increase the corrosion resistance of materials. In local corrosion, nanocrystallization increases the unstable points on the surface of the materials, which increases the possibility of local corrosion. However, the excellent ability of element diffusion helps heal the local corrosion points, which inhibits the growth of the local corrosion.

关键词： Nanocrystalline materials Electrochemical corrosion Review

Oxidation and Hot corrosion Behavior of a Composite Coating System

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Journal of Materials Science & Technology 2003年第6期19卷 567-570页

作者： Dongbai XIE and Fuhui WANGstate key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110016, china Lab. for corrosion and protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The oxidation and hot corrosion behavior of Co-Ni-Cr-AI-Ta-Y coating produced by magnetron sputtering with and without enamel coating has been investigated in air at 900℃ and in molten 75 wt pct NaCl+25 wt pct Na2SO4 at 850℃. The results show that the enamel coating possesses good hot corrosion resistance in the molten salts, in comparison with the sputtered Co-Ni-Cr-AI-Ta-Y coating. In the hot corrosion test, breakaway corrosion did not occur on the samples with enamel coating and the composition of enamel coating did not significantly change either. The oxidation resistance of the sputtered coating, which offers good adhesion, can be improved by the enamel coating.

关键词： Enamel coating Sputtered coating Hot corrosion Isothermal oxidation

Effect of Sputtered TiAlCr Coatings on Oxidation and Hot corrosion Resistance of Ti-24Al-14Nb-3V

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Journal of Materials Science & Technology 2001年第5期17卷 501-506页

作者： Fuhui WANG, Chunhong GUAN, Zhaolin TANG and Weitao WU state key laboratory for corrosion and protection, institute of metal research, The chinese academy of sciences, shenyang 110016, china Lab. for corrosion and protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The effect of sputtered Ti-50Al-10Cr and Ti-50A1-20Cr coatings on both isothermal and cyclic oxidation resistance at 800-900℃ and hot corrosion resistance at 850℃ of Ti-24Al-14Nb-3V was investigated. Results indicated that Ti-24Al-14Nb-3V alloys exhibited poor oxidation resistance due to the formation of Al2O3+TiO2+AlNbO4 mixed scales in air at 800-900℃ and poor hot corrosion resistance due to the spoliation of scales formed in Na2SO4+K2SO4 melts at 850℃. Both Ti-50Al-10Cr and Ti-50Al-20Cr coatings remarkably improved the oxidation and hot corrosion resistance of Ti-24Al-14Nb-3V alloy.

关键词： Ti Cr Effect of Sputtered TiAlCr Coatings on Oxidation and Hot corrosion Resistance of Ti-24Al-14Nb-3V Al

Oxidation behavior of three-phase Cu-25Ni-30Cr alloy at 700-800℃ under high oxygen pressures

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中国有色金属学会会刊：英文版 2005年第3期15卷 491-496页

作者：曹中秋刘伟华翟广平牛焱state key laboratory for corrosion and protection institute of metal research chinese academy of sciences shenyang 110016 china Department of Chemistry Shenyang Normal University Shenyang 110034 China state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The thermogravimetric analysis of a ternary Cu-25Ni-30Cr alloy prepared by conventional casting was performed in 0.1MPa pure O2 at 700-800℃. The results show that the alloy is composed of three phases, where the phase with the largest copper and lowest chromium content forms the matrix, while the other two, much richer in chromium, form a dispersion of isolated particles. At variance with another three-phase Cu-20Ni-20Cr alloy, which forms complex scales containing the oxides of the various components and double oxides plus an irregular region composed of alloy and oxides, the present alloy can form a very irregular but continuous chromia layer at the base of the mixed internal region, producing a gradual decrease of the oxidation rate down to very low values. A larger chromium content needed to form chromia layer for a ternary three-phase alloy is attributed to the limitations to the diffusion of the alloy components in the metal substrate imposed by their multiphase nature.

关键词：铜-镍-铬合金三相高温氧化热解重量

In Situ Scanning-Tunneling-Microscope Observation on Dissolution of a Cu-20Zr Film

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Journal of Materials Science & Technology 2005年第3期21卷 311-314页

作者： Haibo LU, Guoze MENG, Ying LI and Fuhui WANG state key laboratory for corrosion & protection, institute of metal research, chinese academy of sciences, shenyang 110016, china laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A nanocrystalline coating of Cu-20Zr (in wt pct) was obtained on glass by magnetron sputtering. The corrosion behavior of the Cu-20Zr film in 0.001 mol/L HCI solution was investigated using potentiodynamic polarization and in situ electrochemical scanning-tunneling-microscopy (ECSTM). Results demonstrated that the film exhibits active behavior. Microscopic pitting corrosion and tunneling are caused by localized electrodissolution of Zr atoms and the diffusion of Cu atoms at surface defects.

关键词： Magnetron sputtering Film Potentiodynamic polarization ECSTM

metals Supported Water Monomers:the Bonding Nature Revisited

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Journal of Materials Science & Technology 2010年第2期26卷 97-105页

作者： Jibiao Li, Shenglong Zhu and Fuhui Wang state key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110015, china state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

A single water monomer is known as a hard-to-observe molecule even in the presence of metal surfaces as supporting matrix. This review highlights effort in experimental characterizations and theoretical modeling of transition metals supported water monomers with attention given to its structure and bonding, together with the insights that we have provided into the bonding nature of the water-interactions by the newly employed projected PDOS （partial density of states） difference analysis, which is proved to be an effective tool to be elucidate such bonding nature. The general s-d hybridization and d-shell effect are summarized, and how these effects can be tuned by tailoring local surface configurations is discussed.

关键词： Water monomer Adsorption Surface bonding Transition metals

corrosion of Iron and Four Commercial Steels in a Cl-Containing Oxidizing Atmosphere at 500-600℃

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Journal of Materials Science & Technology 2004年第2期20卷 213-216页

作者： Ke ZHANG, Yan NIU, Chaoliu ZENG and Weitao WUstate key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110016, china Lab. for corrosion and protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The corrosion behaviors of Fe and four commercial steels with different Cr contents were investigated in an oxidizing atmosphere containing HCI at 500~600℃, which simulated the environment to which materials are usually exposed in waste incineration. All the test materials underwent an accelerated corrosion in this atmosphere and small amounts of chlorine could be detected at the metal/scale interface. The corrosion mechanism is discussed on the basis of thermodynamic considerations for the reactions between metals and mixed O-Cl gases.

关键词： Commercial steels High temperature Chlorination Waste incineration

Oxidation Behaviour of Sputtered Ni-3Cr-20Al Alloy

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Journal of Materials Science & Technology 2000年第1期16卷 88-90页

作者： Guofeng CHEN and Hanyi LOU (state key laboratory for corrosion and protection, institute of metal research, chinese academy of sciences, shenyang 110015, china) state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900℃ in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20AI coating after 200 h oxidation. However, owing to the segregation of Ni3Al during oxidation process at high temperature, the spinel NiAI2O4 was also formed in the Al2O3 layer. It was found that the formation of NiAI204 had no detrimental effect on the oxidation resistance of the sputtered N?3O-20AI coating due to the excellent adhesion shown by the Al2O3 and NiAl2O4complex oxide scale.

关键词： Al Oxidation Behaviour of Sputtered Ni-3Cr-20Al Alloy Cr Ni