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Enhanced Desorption of PAHs from Manufactured Gas Plant Soils Using Different Types of Surfactants

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Pedosphere 2014年第2期24卷 209-219页

作者： CHONG Zhong-Yi LIAO Xiao-Yong YAN Xiu-Lan SUN Lu ZHAO Dan LIANG Tao Lab of Land Contamination assessment and Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences University of Chinese Academy of Sciences

Surfactant enhanced remediation is thought to be an effective method for the remediation of soils polluted with hydrophoblc organic compounds. Desorption of polycyclic aromatic hydrocarbons （PAHs） from an abandoned manufactured gas plant （MGP） soil was evaluated using four eluting agents including Triton X-100 （TX100）, sodium dodecylbenzene sulfonate （SDBS）, rhamnolipid water solution （RWS） and rhamnolipid fermentation broth （RFB）. The weight solubilization ratios for acenaphthene and fluorene were in the order of TX100 〉 SDBS 〉 RWS 〉 RFB. The Sm value, which indicates the maximum amounts of surfactants adsorbed in the soil, was in the order of RWS 〉 RFB 〉 SDBS 〉 TX100. By using 8 g L-1 of TX100, SDBS and RWS and 100% of RFB, the T-PAHs removal for the MGP soil contaminated with 207.86 mg T-PAHs kg-1 dry soil was 48.0%, 45.7%, 1.9%, and 8.6%, respectively, while that decreased to 41.6%, 37%, 0.38%, and 1.3% for the soil contaminated with 3494.78 mg T-PAHs kg-1 dry soil. Only 8 g L-1 TX100 could remove all types of the 16 PAHs partly in the MGP soil, and the removal efficiencies of different PAHs ranged from 13% to 77.8%. The results of this study herein provide valuable information for the selection of TX100 surfactant for remediating PAH-contaminated soils in MGP.

关键词： adsorption polycyclic aromatic hydrocarbons remediation soil washing solubilization

Adsorption and desorption properties for rhenium using a kind of weak-base anion resin

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Rare Metals 2018年第8期37卷 707-715页

作者： Hong-Zhao Liu Bo Zhang Xiao-Jing Jing Wei Wang Li-Jun Wang Rare Metal and Metallurgy Materials research institute General Research Institute for Nonferrous Metals Beijing 100088 China Zhengzhou institute of Multipurpose Utilization oI Mineral Resources Zhengzhou 450006 China Key Laboratory of evaluation and Multipurpose Utilization of Polymetallic Ore of Ministry of Land and Resources Zhengzhou 450006 China

In this paper, a weak-base resin was adopted to recycle rhenium because of its excellent adsorption and desorption properties for rhenium, while the kinetics and thermodynamics properties of adsorbing rhenium from the rhenium stock solution were systematically investigated. The kinetics investigations confirm that the adsorption process of Re belongs to kinetic control by particle diffusion process and the corresponding reaction rate constant is 2.68 × 10-s s^-1. Then, the Langmuir and Freundlich models were used to describe the adsorption equilibrium behaviors of Re and the thermodynamics parameters are obtained. The results show that the Langmuir model is the best-fitted model, and the Gibbs free energy change of Re adsorption onto ZS 15 weak-base resin is AGO = - 10.59 ＋ 12.66T. To verify the weak-base resins for extracting rhenium in industrial application, the column experiments were operated in the spray solution generating by roasting the molybdenum concentrates. The results indicate that the weak-base resins possess excellent adsorptive selectivity for rhenium, and the ammonia solution with low concentration could sufficiently desorb rhe- nium from the resins.

关键词： Rhenium Weak base Thermodynamics Kinetics

Microstructure and corrosion behavior of the heat affected zone of a stainless steel 308L-316L weld joint

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Journal of Materials Science & Technology 2018年第10期34卷 1823-1834页

作者： Cheng Ma Qunjia Peng Jinna Mei En-Hou Han Wei Ke Key Laboratory of Nuclear Materials and Safety assessment. institute of Metal research Chinese Academy of Science Shenyang 110016 China University of Chinese Academy of Sciences Beifing 100049 China Suzhou Nuclear Power research institute Suzhou 215004 China

Microstructure of the heat affected zone （HAZ） of a 308L-316L stainless steel （SS） weld joint and its corrosion behavior in high temperature water were studied. Peak of the residual strain was observed to approach to the fusion boundary in the HAZ while the strain increased from the top to root areas of the HAZ. The root area of the HAZ shows a lower corrosion resistance in high temperature water than the top and middle areas of the HAZ. This is attributed to a higher level of residual strain in association with a higher density of tangled dislocations in the top area of the HAZ. The results suggest that the residual strain in the HAZ could also promote the SCC through its effect on corrosion, in addition to that on the local microstructure and mechanical property of the steel.

关键词： Stainless steel HAZ Weld joint Corrosion High temperature water

Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents

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Journal of Materials Science & Technology 2019年第4期35卷 520-529页

作者： Xu Zhang Dianzhong Li Yiyi Li Shanping Lu Key Laboratory of Nuclear Materials and Safety assessment Institute of Metal ResearchChinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

The microstructure evolutions and the mechanical properties of the 25Cr-20Ni austenitic stainless steel weld metals with different Nb contents were investigated during the long term aging treatment at 700~?C.M_(23)C_6,Nb(C,N),α-Cr phase and Nb-nitride phase(Z phase)were observed in the microstructures of the aged weld *** results showed that theα-Cr phase precipitated in the interdendritic regions of the weld metals after being exposed to~ 700?C for 500 h and the element Nb accelerated the precipitation of theα-Cr phase *** density of theα-Cr phase decreased with the increase of the distance away from the primary Nb(C,N).Additionally,theα-Cr phase showed a crystallographic relationship with the austenitic matrix,■.It was observed that the Z phase precipitated in the periphery of the Nb(C,N)and may replace the Nb(C,N)after long term exposure to high *** transformation of the Nb(C,N)into Z phase suggested that the Z phase had a higher stability than the Nb(C,N)par^ticles at 700?C for long term *** tensile strength of the Nb-bearing weld metal showed a continuous decrease at the initial stage of the aging treatment and then went up slightly with the prolonged aging ***,the elongations and the impact energies of the weld metals decreased monotonously with the increase of the aging time.

关键词： 25Cr-20Ni steel Weld metal Nb Aging treatment α-Cr phase Mechanical property

Hygrothermal and temperature effects on load-carrying capacity and failure mechanism of open-hole laminates prepared with narrow tape prepreg of GFRP

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Progress in Natural Science:Materials International 2022年第3期32卷 392-399页

作者： Yana Wang Xiang Wang Wei Zhao Yuhuai He Aeronautical Material Testing research Center AECC Beijing Institute of Aeronautical Materials Beijing Key Laboratory of Aeronautical Material Testing and evaluation Key Laboratory of Aeronautical Material Testing and evaluation Aero Engine Corporation of China School of Astronautics Beihang University

The tensile and compressive properties of the open-hole laminates fabricated with glass fiber reinforced polymer(GFRP) under various temperature/humidity coupled conditions are important design parameters for GFRP structures in helicopter. In current work, a comprehensive experimental study about the effects of temperature and hygrothermal on the open-hole mechanical property of HS6/AC318 glass/epoxy multidirectional laminates was conducted. The load-displacement responses, fracture morphologies and failure mechanisms of quasiisotropic GFRP laminates with a center hole under tensile and compressive loads at the five environmental conditions were compared, and the effects of the temperature and hygrothermal on the open-hole tensile(OHL)strengths and open-hole compressive(OHC) strengths of GFRP laminates were investigated. In addition, the relevancies between the OHL and OHC strength of open-hole laminates and the basic material properties of unidirectional laminates were explored, and some links between the OHL strength and interlaminar fracture toughness were found. The results showed that the OHC strength of open-hole laminates was directly proportional to the 0° compressive strength of unidirectional laminates. Based on the experimental data and analysis an empirical formula of the OHC strength at arbitrary temperature and humidity combined conditions was proposed.

关键词： GFRP Open-hole compression Open-hole tension Hygrothermal effect Experiments

Two-stage double peaks ageing and its effect on stress corrosion cracking susceptibility of Al-Zn-Mg alloy

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Journal of Materials Science & Technology 2018年第7期34卷 1250-1257页

作者： Y.L.Wang H.C.Jiang Z.M.Li D.S.Yan D.Zhang L.J.Rong CAS Key Laboratory of Nuclear Materials and Safety assessment Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

Different artificial two-stage ageing behaviors and their effect on stress corrosion cracking （SCC） susceptibility of AI-Zn-Mg alloy have been investigated. The experimental results show that two hardness peaks present on the second-stage ageing-hardening curve when the first-stage ageing is dealt with comparatively lower temperature than the conventional one. The first peak is caused by dispersive and evenly distributed G.P. zones, while η ′phases and coarsened G.P. zones contribute to the second peak. Tensile strength of experimental alloy raises 9.6% （33.2 MPa） and SCC susceptibility decreases 38.9% by applying the second peak ageing regime instead of conventional T73. AI-Zn-Mg alloy obtains high strength and SCC resistance due to its finely dispersive matrix precipitates （MPts）, coarsened and discontinuous grain boundary precipitates （GBPs）, as well as the narrow precipitate free zone （PFZ） in the second peak ageing condition. 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Al-Zn-Mg alloy Two-stage ageing Double peaks ageing Stress corrosion cracking (SCC) susceptibility Grain boundary precipitates (GBPs)

Effect of Cr Doping on the Surface Characteristics of Ni Metal Studied with First-Principles Calculation

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Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 461-470页

作者： Xian-Feng Sun Hai-Tao Wang En-Hou Han CAS Key Laboratory of Nuclear Materials and Safety assessment Institute of Metal ResearchChinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

The influence of Cr doping on the surface characteristics of Ni metal, including the surface energy, work function,adsorption and dissociation, has been investigated by means of first-principles calculation based on density functional theory. The results reveal that with the increase in Cr doping amount, the surface energies for all(111),(110) and(100)surfaces increase, whereas the work functions of(111) and(100) surfaces decrease followed by an increase and that of(110) surface has been decreasing. On the typical Ni(111) and Ni-Cr(111) surfaces, the adsorption energies follow the sequence O > OH > H > H_2O, and the doping of Cr increases the chemical activity of surfaces leading to the improvement of adsorption energies. The H_2O dissociating to OH and H is easier than the subsequent OH dissociating to O and H. The addition of Cr into Ni surface decreases the energy barriers and significantly increases the reaction rate constants.

关键词： Density functional theory Surface characteristics Nickel Cr addition Atomistic simulation

Effects of Forging and Heat Treatments on the Microstructure and Oxidation Behavior of 316LN Stainless Steel in High Temperature Water

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Journal of Materials Science & Technology 2015年第4期31卷 403-412页

作者： Yueling Guo En-Hou Han Jianqiu Wang National Center for Materials Service Safety University of Science and Technology Beijing Key Laboratory of Nuclear Materials and Safety assessment Institute of Metal ResearchChinese Academy of Science

Microstructure of 316 LN stainless steel(ss),including the as-received material and samples processed by solution anneal treatment and stress relief treatment after forging,was characterized by Vickers hardness(HV) testing and electron back scattering diffraction(EBSD).The oxide film formed on samples after immersion in borated and lithiated water at 583.15 K was investigated by scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).Results showed that the grain size of samples was largely reduced after *** fraction of coincidence site lattice(CSL) boundaries and lower residual strain were observed in samples with either solution anneal treatment or stress relief *** proportion of CSL boundaries was largely enhanced by solution anneal treatment after forging,due to the recrystallization occurring during solution anneal *** oxide film grown on 316 LNss with solution anneal treatment after forging exhibited more strong protectiveness,as compared to the oxide film grown on samples with stress relief treatment after forging and the oxide film grown on asreceived samples without *** mechanisms of oxidation were then discussed.

关键词： Stainless steel Forging Corrosion Residual strain

Effect of Hydrogen on Corrosion and Stress Corrosion Cracking of AZ91 Alloy in Aqueous Solutions

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Acta Metallurgica Sinica(English Letters) 2016年第1期29卷 1-7页

作者： Jian Chen Jian-Qiu Wang En-Hou Han Wei Ke D.W.Shoesmith Department of Chemistry Western University Surface Science Western Western University Key Laboratory of Nuclear Materials and Safety assessment Institute of Metal ResearchChinese Academy of Sciences

The effect of hydrogen on the corrosion and stress corrosion cracking of the magnesium AZ91 alloy has been investigated in aqueous solutions. Hydrogen produced by corrosion in water diffuses into, and reacts with the Mg matrix to form hydride. Some of the hydrogen accumulates at hydride/Mg matrix （or secondary phase） interfaces as a consequence of slow hydride formation and the incompatibility of the hydride with the Mg matrix （or secondary phase）, and combines to form molecular hydrogen. This leads to the development of a local pressure at the hydride/Mg matrix （or secondary phase） interface. The expansion stress caused by hydride formation and the local hydrogen pressure due to its accumulation result in brittle fracture of hydride. These two combined effects promote both the corrosion rate of the AZ91 alloy, and crack initiation and propagation even in the absence of an external load. Hydrogen absorption leads to a dramatic deterioration in the mechanical properties of the AZ91 alloy, indicating that hydrogen embrittlement is responsible for transgulanar stress corrosion cracking in aqueous solutions.

关键词： AZ91 alloy Corrosion Hydrogen Secondary ion mass spectroscopy (SIMS) Transgulanarstress corrosion cracking (TGSCC)