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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 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 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 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 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 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 and corrosion resistance of IrO2–ZrO2 binary oxide coatings for promoting oxygen evolution in sulfuric acid solution

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 264-273页

作者： Bao Liu Shuo Wang Cheng-yan Wang Bao-zhong Ma Yong-qiang Chen School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Rare and Precious Metals Green Recycling and Extraction University of Science and Technology BeijingBeijing 100083China

In this study,we prepared Ti/IrO2–ZrO2 electrodes with different ZrO2 contents using zirconium-n-butoxide(C16H36O4Zr)and chloroiridic acid(H2IrCl6)via a sol–gel *** explore the effect of ZrO2 content on the surface properties and electrochemical behavior of electrodes,we performed physical characterizations and electrochemical *** obtained results revealed that the binary oxide coating was composed of rutile IrO2,amorphous ZrO2,and an IrO2–ZrO2 solid *** IrO2–ZrO2 binary oxide coatings exhibited cracked structures with flat regions.A slight incorporation of ZrO2 promoted the crystallization of the active component ***,the crystallization of IrO2 was hindered when the added ZrO2 content was greater than 30at%.The appropriate incorporation of ZrO2 enhanced the electrocatalytic performance of the pure IrO2 *** Ti/70at%IrO2–30at%ZrO2 electrode,with its large active surface area,improved electrocatalytic activity,long service lifetime,and especially,lower cost,is the most effective for promoting oxygen evolution in sulfuric acid solution.

关键词： electrode IrO2-ZrO2 oxygen evolution reaction electrochemical behavior corrosion resistance

electrochemical behavior of Mitoxantrone and Its Determination at a Pt/C Implanted Modified Microelectrode

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Chemical Research in Chinese Universities 2004年第1期20卷 103-107页

作者： QIANYong-gui SUNZi-jie HUJing-bo LUYi-qiang LIQi-long DepartmentofChemistry BeijingNormalUniversityBeijing100875P.R.China DepartmentofChemistry BeijingUniversityofScienceandTechnologyBeijing100083P.R.China

In a 0.02 mol/L Na_2HPO_4-KH_2PO_4(PBS) buffer solution(pH=6.82), the electrochemical behavior of mitoxantrone was studied by linear-sweep voltammetry and cyclic voltammetry at a Pt/C ion implantation modified microelectrode. A sensitive reduction peak was observed. The peak potential was \{-0.72 V\}(***), the peak current was proportional to the concentration of mitoxantrone within the ranges of 7.0×10 -8—9.0×10 -7 mol/L and 1.0×10 -6—2.4×10 -5 mol/L, with a detection limit of 4.0×10 -8 mol/L. The linear correlation coefficients were 0.9994 and 0.9992, respectively. This method has been applied to the direct determination of mitoxantrone in simulated urine. The recoveries were in the range from 96.2% to 105.9%. The reduction process was a quasi-reversible one with adsorptive characteristics at the Pt/C microelectrode. The electrode reaction rate constant k_s and the electron transfer coefficient α of the system were determined to be 4.5 and 0.65 s -1, respectively. The experiments showed that Pt element had surely been implanted into the surface of the carbon fiber, and the atomic Pt improved the electrocatalytic activity. The Pt/C microelectrode had a good stability and reproducibility.

关键词： Mitoxantrone electrochemical behavior Ion implantation Modified microelectrode

electrochemical behavior of K_3Fe(CN)_6 in water-in-oil microemulsion

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Journal of Central South University 2009年第1期16卷 61-65页

作者：周海晖曾伟英晓芳曾金祥李丹陈金华旷亚非 College of Chemistry and Chemical Engineering Hunan University

A water-in-oil (W/O) microemulsion composed of Triton X-100, n-hexanol, n-hexane and water solution with hydrochloric acid was prepared. K3Fe(CN)6 was added in as a water-soluble electroactive probe, and its electrochemical behavior was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It is found that the H+ concentration of the water phase has a great effect on the conductivity of the W/O microemulsion, and hence influences the electrochemical behavior of K3Fe(CN)6. When the pH value of water phase is about 7, the electrical conductivity of the W/O microemulsion is only 1.2×10-6 S/cm, and K3Fe(CN)6 almost cannot react at the glassy carbon electrode. But when the H+ concentration is more than 3 mol/L, the W/O microemulsion has a good electrical conductivity and K3Fe(CN)6 shows good electrochemical performance in it. The results of CV and EIS studies indicate that the electrochemical behavior of Fe(CN)63-/Fe(CN)64- in the W/O microemulsion is different from that in the aqueous solution. This may be due to the unique liquid structure of the W/O microemulsion and the unique mass transfer in the W/O microemulsion.

关键词： K3Fe(CN)6 electrochemical behavior W/O microemulsion electrical conductivity