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electrochemical behavior of Dy(Ⅲ) on bismuth film electrode in eutectic LiCl-KCl melts

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Journal of Rare Earths 2018年第9期36卷 1007-1014页

作者： Shanshan Wang Baicong Wei Mei Li Wei Han Milin Zhang Xiaoguang Yang Yang Sun Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering University

An electrochemical study of dysprosium（III） on Bi film electrode was carried out in eutectic LiCl-KCI melts by transient and steady state electrochemical *** results of transient electrochemical techniques showed that the reduction of Dy（III） appears at a more positive value than the one detected on W electrode owing to the formation of Bi-Dy intermetallic compounds through electrochemical deposition of Dy on bismuth film *** thermodynamic properties of the formation for Dy-Bi intermetallics were estimated by a steady state electrochemical method in a temperature range of 713-803 ***,the electrochemical preparation of Bi-Dy alloys was conducted by galvanostatic electrolysis at different current *** Bi-Dy alloys,characterized by scanning electron microscopy equipped with energy dispersive spectrometry and X-ray diffraction,are comprised of DyBi3/5 and DyBi phases

关键词： electrochemical behavior Bi film electrode Bi-Dy alloy Molten chlorides electrochemical formation Rare earths

electrochemical behavior of hemoglobin in neutral surfactants with different poly(ethylene oxide) unit lengths adsorbed on an electrode

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Science China Chemistry 2012年第1期55卷 151-157页

作者： LV Xue GAO Ge LIU FengQi College of Chemistry Jilin UniversityChangchun 130012China

The direct electron transfer and adsorption behavior of hemoglobin(Hb) in a series of surfactants with different poly(ethylene oxide)(PEO) unit lengths on a glassy carbon electrode have been *** a surfactant of appropriate PEO unit length,the surfactant film-modified electrode exhibited a more stable adsorption state with a larger surface coverage of Hb and a more positive formal potential,which can be attributed to the effect of hydrogen bonding between proteins and *** electrochemical behavior of surfactants with different PEO unit lengths is discussed in ***,UV-visible spectroscopy demonstrated that the structure of Hb was not destroyed in the surfactant *** electrocatalytic activity of hydrogen peroxide on three neutral surfactant-modified electrodes has also been investigated.

关键词： nonionic surfactant electrochemical behavior hemoglobin adsorption

electrochemical behavior of Ti-6.5Al-2Zr-1Mo-1V alloy under rotating condition with periodically fluctuating current density

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Chinese Journal of Aeronautics 2022年第5期35卷 484-496页

作者： Zhiyuan REN Dengyong WANG Juchen ZHANG Huayong LE Di ZHU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing 210016China School of Mechanical Engineering Hefei University of TechnologyHefei 230009China

Titanium alloy plays a crucial role in the electrochemical field due to its excellent corrosion *** passivation and dissolution behaviors of Ti-6.5Al-2Zr-1Mo-1V(TA15)alloy in Na Cl solution were studied by simulating the electrochemical machining process in a rotating condition,which made the anode in a state with alternating high and low current *** probe micro analysis,ultra-depth microscope,scanning electron microscope,and X-ray photoelectron spectrometer were used to reveal the evolution of TA15 under fluctuating current *** existence state of the passivation film on TA15 surface was closely related to the pulse frequency of the periodically fluctuating current *** higher pulse frequency of 0.20 Hz,the material was hardly dissolved because passivation dominated the electrolysis behavior,while at lower pulse frequency of 0.01 Hz,the passivation and dissolution behaviors occurred alternately with the variation of the current ***,the thickness of the passivation film was inversely proportional to the applied current *** to the different electrochemical characteristics of a phase andβphase,the surface of the TA15 changed from being smooth to porous after a *** addition,the change of microstructure affected the content of O^(2–)and exposed the suboxides of *** a word,the change of pulse frequency and current density affected the electrochemical behavior of TA15,which was different from the conventional steady condition.

关键词： Dissolution electrochemical behavior Passivation Rotating condition Ti-6.5Al-2Zr-1Mo-1V alloy

electrochemical behavior of gold and its associated minerals in alkaline thiourea solutions

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International Journal of Minerals,Metallurgy and Materials 2018年第7期25卷 737-743页

作者： he zhou yong-sheng song wen-juan li kun song national engineering laboratory of biohydrometallurgy grimat engineering institute co.ltdbeijing 101407China school of chemical&environmental engineering china university of mining&technologybeijing 100083China

electrochemical measurements were conducted to study the electrochemical behavior of gold （Au） and its commonly associated minerals in alkaline thiourea solutions. The results indicated that without addition of any stabilizer, selective dissolution of Au from stibnite and pyrite was only possible at relatively low thiourea concentrations. As Na2SiO3 was added, pyrite started to become active and an oxida- tion peak appeared; the oxidation peaks of axsenopyrite and chalcocite appeared earlier thaxl that of Au. The chalcocite peak shifted in the positive direction and the peak current increased. Stibnite did not show an oxidation peak and its current was nearly zero. Adding Na2SiO3 favored the selective dissolution of Au when its minerals were associated with chalcocite and stibinte. At pH 12, the Au anode dissolution peak current increased with stabilizer concentration. At 0.38 and 0.42 V and for Na2SiO3 concentration below 0.09 M, the current density continuously increased with Na2SiO3 concentration. The Na2SiO3 concentration had to be adequate to stabilize thiourea. When the potential was higher than 0.42 V, the surface of the Au electrode started to passivate. With an additional increase in potential, the presence of Na2SiO3 could not stop the inevitable decomposition of thiourea.

关键词： alkaline daiourea Au associated mineral Na2SiO3 electrochemical behavior

electrochemical behavior of microbiologically influenced corrosion on Fe_3Al in marine environment

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Acta Metallurgica Sinica(English Letters) 2009年第4期22卷 313-320页

作者： Xueting CHANG Shougang CHEN Guanhui GAO Yansheng YIN Sha CHENG Tao LIU Institute of Materials Science and Technology Ocean University of China Qingdao 266100 China

In this article, microbiologically influenced corrosion behavior of Fe3Al intermetallie compound in microorganism culture medium has been investigated by using weight loss methods, electrochemical techniques, and electron microscopy. Polarization curves showed that a sharp electrical current peak caused by surface pitting could be observed after Fe3Al electrodes were immersed in culture medium for 15 days when the polarization potential was about -790 mV vs SCE. Based on the electrochemical impedance spectroscopy （EIS） and the equivalent circuit parameters of the associated system, the corrosion products were found to exhibit a two-layer structured feature and the microorganisms could induce pitting and erosion corrosion of the inner layer. In addition, the passivating film of the inner layer was absolutely destroyed by microbial metabolic products.

关键词： electrochemical behavior Fe3Al Microbiologically influenced corrosion Marine

electrochemical behavior of Mg-Al-Pb alloy in 3.5% NaCl solution

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Journal of Central South University 2016年第10期23卷 2475-2482页

作者：文利余琨房洪杰熊汉青尹翔朱化龙马家骥姜大越 Department of Materials Science and Engineering Yantai Nanshan University School of Materials Science and Engineering Central South University

An investigation on electrochemical behavior of Mg-5%Pb alloy, Mg-6%Al alloy and Mg-6%Al-5%Pb alloy(mass fraction) in 3.5% Na Cl(mass fraction) solution was conducted using electrochemical measurements and corroded morphology observation, in which solid solution and the as-aged state of each alloy were compared to discuss the influence mechanism of lead and aluminium on the electrochemical properties of alloys. The X-ray diffraction(XRD) analysis was performed to make microstructure characterization. The electrochemical results indicate that the corrosion of Mg-5%Pb alloy is predominated by homogeneous pitting and dissolution of PbCl_2 film due to Cl ions attack, while corrosion crevice propagates along grain boundaries in solid solution of Mg-6%Al alloy and the micro galvanic corrosion also plays vital role in Mg_(17)Al_(12) phase containing experimental alloys. The co-existence of lead and aluminium in magnesium alloy increases corrosion current density and electrochemical activity as well. The comparison between solid solution and the as-aged state demonstrates that Mg_2 Pb and Mg_(17)Al_(12) somewhat increase corrosion resistance but lighten anodic polarization by facilitating corrosion product flaking off.

关键词： Mg-Al-Pb alloy electrochemical behavior corrosion solid solution as-aged state

electrochemical behavior of CoSb_3-based Electrodes Using Binary PAni/PVDF Binder

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Journal of Materials Science & Technology 2007年第1期23卷 142-144页

作者： Jian XIE Xinbing ZHAO Gaoshao CAO Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

The polyaniline （PAni）/polyvinylidene fluoride （PVDF） hybrid was served as a novel binder for CoSb3-based alloy electrode. The effect of PAni content on the electrochemical performances of the alloy electrode was investigated. It was found that the CoSb3 electrode using the binary PAni/PVDF binder exhibits higher reversible capacity than that using the single PVDF binder, especially in the initial cycles. As a result, the PAni/PVDF hybrid could be a promising binder for the alloy electrode.

关键词： PAni/PVDF binder CoSb3 electrode electrochemical behavior Lithium ion batteries

electrochemical behavior of tantalum in ethylene carbonate and aluminum chloride solvate ionic liquid

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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2283-2292页

作者： Ai-min LIU Meng-xia GUO Zi-yang LÜ Bao-guo ZHANG Feng-guo LIU Wen-ju TAO You-jian YANG Xian-wei HU Zhao-wen WANG Yu-bao LIU Zhong-ning SHI Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

To investigate the electrochemical reduction mechanism of Ta(Ⅴ)in ethylene carbonate and aluminum chloride(EC-AlCl3)solvate ionic liquid,cyclic voltammetry experiments were conducted on a tungsten working *** reduction peaks were observed in the cyclic voltammogram of the EC-AlCl3-TaCl5 ionic *** reduction peaks at-0.55,-0.72,and-1.12 V(vs Al)were related to the reduction of Ta(Ⅴ)to tantalum metal by three stages including the formation of Ta(Ⅳ)and Ta(Ⅲ)complex *** reduction of Ta(Ⅲ)to tantalum metal was an irreversible diffusion-controlled reaction with a diffusion coefficient of 3.7×10^-7 cm^2/s at 323 K,and the diffusion activation energy was 77 k J/***,the cathode products at 323 K were characterized by scanning electron microscopy,energy-dispersive spectroscopy,and X-ray photoelectron *** results showed that tantalum metal and tantalum oxides were obtained by potentiostatic electrodeposition at-0.8 V for 2 h.

关键词： electrochemical behavior ionic liquid cyclic voltammetry aluminum chloride tantalum

electrochemical behavior and electrolytic preparation of lead in eutectic NaCl−KCl melts

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2568-2576页

作者： Zeng-li ZHU Huan LIU Jie-shuang-yang CHEN Hui KONG Liang XU Zhong-sheng HUA Zhuo ZHAO School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032China Jinguan Copper Branch Tongling Nonferrous Metals Group Holding Co.Ltd.Tongling 244000China Anhui Provincial Key Laboratory of Metallurgical Engineering&Resources Recycling Anhui University of TechnologyMa’anshan 243002China

A novel molten salt extraction process consisting of chlorination roasting and molten salt electrolysis was proposed to develop a more efficient and environmental friendly technology for recovering lead from spent lead acid batteries(LABs).The feasibility of this process was firstly assessed based on thermodynamics *** electrochemical behavior of Pb(II)on a tungsten electrode in the eutectic NaCl−KCl melts at 700℃ was then investigated in detail by transient electrochemical *** results indicated that the reduction reaction of Pb(II)in NaCl−KCl melts was a one-step process exchanging two electrons,and it was determined to be a quasi-reversible diffusion-controlled ***,potentiostatic electrolysis was carried out at−0.6 V(vs Ag/AgCl)in the NaCl−KCl−PbCl2 melts,and the obtained cathodic product was identified as pure Pb by X-ray diffraction *** investigation demonstrated that it is practically feasible to produce pure Pb metal by electrochemical reduction of PbCl2 in eutectic NaCl−KCl melts,and has provided important fundamental for the further study on lead recovery from spent LABs via molten salt extraction process.

关键词： electrochemical behavior Pb(II) reduction spent lead acid batteries eutectic NaCl−KCl melt