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Electrochemical Co-reduction of Bi(Ⅲ)and Y(Ⅲ)and Extracting Yttrium from Molten LiCl-KCl Using Liquid Bi as Cathode
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作者 LI Mei LIU Yichuan +4 位作者 SUN Zhongxuan HAN Wei ZHANG Milin YANG Xiaoguang SUN Yang 《高等学校化学研究:英文版》 SCIE CAS CSCD 2019年第1期60-64,共5页
The electrochemical reaction of Bi(Ⅲ)and co-reduction behaviour of Bi(Ⅲ)and Y(Ⅲ)ions were researched in molten LiCl-KCl on a ttmgsten(W)electrode employing a range of electrochemical teclmiques.Cyclic voltammetric ... The electrochemical reaction of Bi(Ⅲ)and co-reduction behaviour of Bi(Ⅲ)and Y(Ⅲ)ions were researched in molten LiCl-KCl on a ttmgsten(W)electrode employing a range of electrochemical teclmiques.Cyclic voltammetric and square-wave voltanunetric results revealed that the reduction of Bi(Ⅲ)was a one-step process,with the exchange of three electrons on a W electrode,and diffusion-controlled.The electrochemical curves showed two reduction peaks pertaining to the formation of Bi-Y alloy compounds,because of the co-reduction of Bi(Ⅲ)and Y(Ⅲ) by metallic Y deposited on the pre-deposited Bi-coated W electrode and reacting with Bi metal in molten LiCl-KCl. Furthermore,galvanostatic electrolysis was conducted using liquid Bi as cathode to extract yttrium at different current intensities,and the extractive products were analyzed by SEM,EDS and XRD.The results indicated that BiY intermetallic compotmd was formed in the molten LiCl-KCl-YCl3 system. 展开更多
关键词 ELECTROCHEMICAL co-reduction:Electrochemical behaviour Bi-Y intennetallic compound GALVANOSTATIC ELECTROLYSIS
Application of electrochemistry to single-molecule junctions: from construction to modulation
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作者 Gan Wang Biao-Feng Zeng +3 位作者 Shi-Qiang Zhao Qiao-Zan Qian Wenjing Hong Yang Yang 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第10期1333-1345,共13页
State-of-the-art molecular electronics focus on the measurement of electrical properties of materials at the single-molecule level.Experimentally, molecular electronics face two primary challenges. One challenge is th... State-of-the-art molecular electronics focus on the measurement of electrical properties of materials at the single-molecule level.Experimentally, molecular electronics face two primary challenges. One challenge is the reliable construction of single-molecule junctions, and the second challenge is the arbitrary modulation of electron transport through these junctions. Over the past decades, electrochemistry has been widely adopted to meet these challenges, leading to a wealth of novel findings. This review starts from the application of electrochemical methods to the fabrication of nanogaps, which is an essential platform for the construction of single-molecule junctions. The utilization of electrochemistry for the modification of molecular junctions,including terminal groups and structural backbones, is introduced, and finally, recent progress in the electrochemical modulation of single-molecule electron transport is reviewed. 展开更多
关键词 SINGLE-MOLECULE electronics molecular JUNCTION ELECTROCHEMICAL deposition ELECTROCHEMICAL GATING
Electrochemical analysis and convection-enhanced mass transfer synergistic effect of MnO_x/Ti membrane electrode for alcohol oxidation
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作者 Hong Wang Xin Wei +3 位作者 Yujun Zhang Ronghua Ma Zhen Yin Jianxin Li 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第1期150-156,共7页
The different electrocatalytic reactors could be constructed for the electrocatalytic oxidation of 2,2,3,3-tetrafluoro-1-propanol(TFP) with two typical MnOx/Ti electrodes, i.e.the electrocatalytic membrane reactor(ECM... The different electrocatalytic reactors could be constructed for the electrocatalytic oxidation of 2,2,3,3-tetrafluoro-1-propanol(TFP) with two typical MnOx/Ti electrodes, i.e.the electrocatalytic membrane reactor(ECMR) with the Ti membrane electrode and the electrocatalytic reactor(ECR) with the traditional Ti plate electrode.For the electro-oxidation of TFP, the conversion with membrane electrode(70.1%) in the ECMR was 3.3 and 1.7 times higher than that of the membrane electrode without permeate flow(40.8%) in the ECMR and the plate electrode(21.5%) in the ECR, respectively.Obviously, the pore structure of membrane and convection-enhanced mass transfer in the ECMR dramatically improved the catalytic activity towards the electro-oxidation of TFP.The specific surface area of porous electrode was 2.22 m2·g-1.The surface area of plate electrode was 2.26 cm2(1.13 cm2× 2).In addition, the electrochemical results showed that the mass diffusion coefficient of the MnOx/Ti membrane electrode(1.80 × 10-6 cm2·s-1) could be increased to 6.87 × 10-6 cm2·s-1 at the certain flow rate with pump, confirming the lower resistance of mass transfer due to the convection-enhanced mass transfer during the operation of the ECMR.Hence, the porous structure and convection-enhanced mass transfer would improve the electrochemical property of the membrane electrode and the catalytic performance of the ECMR,which could give guideline for the design and application of the porous electrode and electrochemical reactor. 展开更多
关键词 Electrocatalytic MEMBRANE REACTOR (ECMR) MnOx/Ti MEMBRANE electrode Electro-oxidation of 2 2 3.3-tetrafluoro-1-propanol(TFP) ELECTROCHEMICAL REACTOR (ECR) ELECTROCHEMICAL measurement
含聚合物污水电化学处理中油珠与气泡的变化及对除油效果的影响 预览
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作者 朱宗全 靖波 +2 位作者 王秀军 杨航 尹先清 《油田化学》 CAS CSCD 北大核心 2019年第1期163-168,共6页
为提高电化学除油效果,通过形态原位识别技术分析电化学方法处理油田含聚合物污水的动态过程中油珠和气泡的聚集形态变化,利用絮体分形理论描述了油珠和气泡的分形成长特征,用分形维数表征了电化学处理时间对二者的影响及变化规律,研究... 为提高电化学除油效果,通过形态原位识别技术分析电化学方法处理油田含聚合物污水的动态过程中油珠和气泡的聚集形态变化,利用絮体分形理论描述了油珠和气泡的分形成长特征,用分形维数表征了电化学处理时间对二者的影响及变化规律,研究了油珠和气泡变化对除油效果的影响。结果表明,气泡分时形态变化较小,其分形维数(Df)在2.05附近波动;油珠分时形态变化较大,随着处理时间的延长油珠粒径变大,其Df在1.804数1.964之间,二者的形态与分形维数呈现良好的相关性。输出电流越大,气泡的平均当量圆直径(de)越小,除油效果越好。在电化学处理过程中,油珠与气泡发生黏附,随着处理时间延长油珠在气泡的作用下快速聚集,加快了油珠的上浮分离,气泡de变小,油珠平均当量圆直径(dn)变大。在处理电流为4A、动态停留时间(t2)为25min时,气泡de为49.72μm,油珠dn为57.39μm,除油率达到86.15%;电流为8A时,t2在10数20min的除油率大于80%。较高输出电流、较短的动态停留时间或较低输出电流、较长的停留时间均有利于改善除油效果。 展开更多
关键词 电化学 污水 聚合物 油珠 气泡 形态分析 分形维数 除油效果
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Vesicular Li3V2(PO4)3/C hollow mesoporous microspheres as an efficient cathode material for lithium-ion batteries
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作者 Hongxia Sun Haoran Du +3 位作者 Mengkang Yu Kuangfu Huang Nan Yu Baoyou Geng 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第8期1937-1942,共6页
Vesicular lithium vanadium phosphate/carbon hollow mesoporous microspheres were fabricated using a facile polyvinylpyrrolidone-assisted aerosol-spray-assisted method and subsequent heat-treatment. While changing the c... Vesicular lithium vanadium phosphate/carbon hollow mesoporous microspheres were fabricated using a facile polyvinylpyrrolidone-assisted aerosol-spray-assisted method and subsequent heat-treatment. While changing the content of polyvinylpyrrolidone, we found that carbon content was adjustable on the surface of lithium vanadium phosphate. By optimizing the carbon content among the composites, the electrochemical performance can be enhanced significantly. The results of electrochemical performance tests suggested that the samples exhibited good cycle performance and high discharge capability in the voltages between 3.0-4.8 V. The observed excellent electrochemical performances could be attributed to the proper content of carbon coating and the vesicular hollow mesoporous microsphere structure, increasing the transmission rate of lithium ions and reducing the structural change during charging and discharging effectively. 展开更多
关键词 U3V2(PO4)3 aerosol-spray-assisted approach POLYVINYLPYRROLIDONE vesicular HOLLOW MICROSPHERE electrochemical properties
Utilization of the superior properties of highly mesoporous PVP modified NiCo2O4 with accessible 3D nanostructure and flower-like morphology towards electrochemical methanol oxidation reaction 预览
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作者 Gracita M.Tomboc Medhen W.Abebe +1 位作者 Anteneh F.Baye Hern Kim 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第2期136-146,共11页
Up to this date,researchers are still facing difficulties to expand the technology of direct methanol fuel cells(DMFCs) because of the high overpotential required to oxidize the methanol and its relatively poor perfor... Up to this date,researchers are still facing difficulties to expand the technology of direct methanol fuel cells(DMFCs) because of the high overpotential required to oxidize the methanol and its relatively poor performance due to CO poisoning of the leading-high cost anode catalyst.In line with this,we have successfully modified the morphological structure and composition of low cost cobalt based-metal oxides,MCo2O4(M = Zn and Ni),with the simple and noble use of polyvinyl pyrrolidone(PVP) as growth modifier and surface stabilizer during the synthesis of nanoparticles in our previous reports,which shown high electrocatalytic activity and strong stability.Due to the good performance of our PVP modified MCo2O4 towards pseudocapacitor and oxygen evolution reaction applications,we decided to extend our research study to methanol oxidation reaction.Remarkably,PVP modified Ni Co2O4 electrode directly grown on nickel foam substrate via a simple hydrothermal process exhibited better performance compared with PVP modified ZnCo2O4 and NiCo2O4 without PVP.It had obtained a remarkably low onset potential of 0.285 V and high current density of 280 m A cm-2,and shown great stability and high poison tolerance during a continuous CV cycling and Chronoamperometry test,which attained high efficiency of 86.86%and 98.52%,respectively.These positive results of PVP modified Ni Co2O4 electrode towards MOR might be attributed to its hierarchical 3 D nanostructures with highly mesoporous surface and large surface area which may have provided numerous electroactive sites,and the exceptional corrosion stability of Ni Co2O4 electrode in alkaline solution. 展开更多
关键词 NiCo2O4 3D NANOSTRUCTURE ELECTROCHEMICAL METHANOL oxidation Current density
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Ti35合金在含氟离子硝酸中电化学腐蚀行为
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作者 徐建平 苏航标 +3 位作者 郭荻子 赵永庆 许并社 周廉 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2019年第4期1124-1129,共6页
采用电化学测试系统测试了Ti35合金在含有不同氟离子浓度的6mol/L硝酸溶液中的开路电位(OCP)、极化曲线、电化学阻抗谱(EIS),探讨了氟离子对Ti35合金耐蚀性能的影响。结果表明:随着氟离子浓度的增加,合金耐蚀性下降,但总体而言合金仍具... 采用电化学测试系统测试了Ti35合金在含有不同氟离子浓度的6mol/L硝酸溶液中的开路电位(OCP)、极化曲线、电化学阻抗谱(EIS),探讨了氟离子对Ti35合金耐蚀性能的影响。结果表明:随着氟离子浓度的增加,合金耐蚀性下降,但总体而言合金仍具有良好的耐蚀性。影响合金耐蚀性转变的氟离子浓度临界值约为1.25 mmol/L,进一步应用混合电位理论,解释合金耐蚀性转变的原因。 展开更多
关键词 钛合金 氟离子 腐蚀行为 电化学
钨铼合金电化学溶解工艺研究 预览
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作者 郭瑞 赵星晨 +4 位作者 李波 许万祥 王靖坤 周严 李进 《广州化工》 CAS 2019年第14期63-65,共3页
采用电化学溶解法对某钨铼合金废料在氢氧化钠电解体系中的溶解过程进行研究。考察了电流密度、电解液碱度、温度、电解液钨离子浓度对电解过程的影响。实验结果表明,在阳极电流密度400A/m^2、氢氧化钠浓度300g/L、电解液温度40~45℃的... 采用电化学溶解法对某钨铼合金废料在氢氧化钠电解体系中的溶解过程进行研究。考察了电流密度、电解液碱度、温度、电解液钨离子浓度对电解过程的影响。实验结果表明,在阳极电流密度400A/m^2、氢氧化钠浓度300g/L、电解液温度40~45℃的条件下平均槽电压为2.5V,合金电化学溶解率可达98%,使得大部分钨、铼以阴离子状态转入溶液中,完成钨铼合金的高效溶解,工艺简单高效,可实现工业化生产。 展开更多
关键词 电化学 钨铼合金 溶解
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稀土元素对镁合金磷酸盐转化膜性能的影响 预览
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作者 王瑶 邵忠财 +2 位作者 王鑫 吴梦岐 李岫元 《电镀与环保》 CAS CSCD 北大核心 2019年第2期30-33,共4页
采用化学转化法在镁合金表面制备了磷酸盐转化膜,并研究了稀土元素钕和铈对磷酸盐转化膜性能的影响。结果表明:向磷酸盐转化液中加入钕元素或铈元素时,磷酸盐转化膜的耐蚀性均显著提高。加入0.4g/L钕元素和0.4g/L铈元素时,磷酸盐转化膜... 采用化学转化法在镁合金表面制备了磷酸盐转化膜,并研究了稀土元素钕和铈对磷酸盐转化膜性能的影响。结果表明:向磷酸盐转化液中加入钕元素或铈元素时,磷酸盐转化膜的耐蚀性均显著提高。加入0.4g/L钕元素和0.4g/L铈元素时,磷酸盐转化膜的耐硫酸铜点滴时间分别可以达到50.2s和54.2s。添加稀土元素未改变磷酸盐转化膜的表面形貌和组成。另外,加入0.4g/L铈元素时,磷酸盐转化膜的耐蚀性最好。 展开更多
关键词 镁合金 磷酸盐转化膜 稀土元素 耐蚀性 电化学
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Effect of chloride ion on corrosion behavior of low carbon steel in 0.1 M NaHCO3 solution with different dissolved oxygen concentrations
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作者 Fang Xue Xin Wei +2 位作者 Junhua Dong Changgang Wang Wei Ke 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第4期596-603,共8页
The corrosion behavior of low carbon steel in 0.1 M NaHCO3+ 0.1 M NaCl solution with different dissolved oxygen concentrations was investigated with gravimetric tests and electrochemical measurements.Results show that... The corrosion behavior of low carbon steel in 0.1 M NaHCO3+ 0.1 M NaCl solution with different dissolved oxygen concentrations was investigated with gravimetric tests and electrochemical measurements.Results show that the corrosion mass loss of steel is remarkably increased with the addition of chloride ion. In the initial stage, the carbon steel tends to active dissolution due to the dissolution effect of chloride ion on the oxide film;as a result, the corrosion potential maintains as low values. With the immersion time going by, the corrosion potential of the steel is promoted as a result of the accumulation of the corrosion products. However, the rust layer is loose and porous due to the deteriorating effect of chloride ion, which decreases the reduction resistance of oxygen. Meanwhile, the porous rust layer could be repaired by the depolarization of oxygen. Under the synergistic effect of chloride ion and oxygen, the corrosion of the steel is accelerated during the repeated process of dissolution and reparation of the oxide film. 展开更多
关键词 Carbon steel CHLORIDE ion Electrochemical measurements RUST characterization LOCALIZED corrosion
Surface modification with oxygen vacancy in Li-rich layered oxide Li1.2Mn0.54Ni0.13Co0.13O2 for lithium-ion batteries
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作者 Bozhou Chen Bangchuan Zhao +4 位作者 Jiafeng Zhou Zhitang Fang Yanan Huang Xuebin Zhu Yuping Sun 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第6期994-1002,共9页
A couple of layered Li-rich cathode materials Li1.2Mn0.54Ni0.13Co0.13O2 without any carbon modification are successfully synthesized by solvothermal and hydrothermal methods followed by a calcination process. The samp... A couple of layered Li-rich cathode materials Li1.2Mn0.54Ni0.13Co0.13O2 without any carbon modification are successfully synthesized by solvothermal and hydrothermal methods followed by a calcination process. The sample synthesized by the solvothermal method(S-NCM) possesses more homogenous microstructure, lower cation mixing degree and more oxygen vacancies on the surface, compared to the sample prepared by the hydrothermal method(H-NCM). The S-NCM sample exhibits much better cycling performance, higher discharge capacity and more excellent rate performance than H-NCM. At 0.2 C rate,the S-NCM sample delivers a much higher initial discharge capacity of 292.3 mAh g^-1 and the capacity maintains 235 m Ah g^-1 after 150 cycles(80.4% retention), whereas the corresponding capacity values are only 269.2 and 108.5 m Ah g^-1(40.3% retention) for the H-NCM sample. The S-NCM sample also shows the higher rate performance with discharge capacity of 118.3 mAh g^-1 even at a high rate of 10 C, superior to that(46.5 m Ah g^-1) of the H-NCM sample. The superior electrochemical performance of the S-NCM sample can be ascribed to its well-ordered structure, much larger specific surface area and much more oxygen vacancies located on the surface. 展开更多
关键词 Li-rich cathode oxide material Oxygen VACANCY SOLVOTHERMAL method Electrochemical performance
Corrosion Behavior of High-Strength Steel for Flexible Riser Exposed to CO2-Saturated Saline Solution and CO2-Saturated Vapor Environments
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作者 Da-Zheng Zhang Xiu-Hua Gao +4 位作者 Lin-Xiu Du Hong-Xuan Wang Zhen-Guang Liu Ning-Ning Yang R. D. K. Misra 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第5期607-617,共11页
The corrosion behavior of high-strength steel used for flexible riser exposed to CO2-saturated saline solution and CO2- saturated vapor environments was studied through immersion experiment and electrochemical corrosi... The corrosion behavior of high-strength steel used for flexible riser exposed to CO2-saturated saline solution and CO2- saturated vapor environments was studied through immersion experiment and electrochemical corrosion experiment. The corrosion behavior and mechanism of the tested steel were analyzed on the basis of corrosion kinetics, nature of corrosion products, corrosion product morphology, elemental distribution and polarization curves. The experimental results showed that the microstructure of the tested steel was bainitic microstructure. The corrosive activity of the tested steel exposed to CO2- saturated vapor environment was significantly lower than that exposed to CO2- saturated saline solution environment.On prolonging the exposure time, the corrosion rate gradually decreased, the corrosion heterogeneity increased, and the dimensions of FeCO3 crystals gradually became small. At later stages of corrosion, the corrosion current density decreased significantly and the anodic Tafel slope increased, indicating that the corrosion process was strongly inhibited. The corrosion mechanism of low-alloy steel with bainitic microstructure was proposed based on experimental results. 展开更多
关键词 Flexible RISER HIGH-STRENGTH bainitic steel CO2 corrosion ELECTROCHEMICAL behavior
Effect of Nb on corrosion behavior of inner bottom plate of cargo oil tankers
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作者 Xiang-yu Xu Long Tian +4 位作者 Yun Zhou Ming-yu Sun Xue-min Wang Cheng-jia Shang R.D.K. Misra 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第6期611-620,共10页
The effect of Nb on the corrosion resistance of steels in simulating an oil-corrosion environment was investigated by means of microstructure observation, electrochemical test, dissolved Nb content measurement and Nb ... The effect of Nb on the corrosion resistance of steels in simulating an oil-corrosion environment was investigated by means of microstructure observation, electrochemical test, dissolved Nb content measurement and Nb segregation observation. The results show that the microstructure of the experimental steels is mainly ferrite with a little pearlite. The dissolved Nb contents of the experimental steels are 0.0235 and 0.0458 wt.%, respectively, while the undissolved Nb content is nearly the same. In addition to enhancing mechanical properties of the steel, dissolved Nb improves the corrosion resistance by enriching Nb in the rust layer. Nb oxides in the rust layer cause a decrease in the corrosion rate due to a decrease in the anodic reaction kinetics. The segregation of Nb at the grain boundaries suppresses the corrosion. Moreover, Nb is enriched at the bottom of the corrosion pit and prevents any further corrosion. 展开更多
关键词 Low-alloy steel Acid CORROSION PITTING CORROSION Electrochemical IMPEDANCE spectroscopy SEGREGATION
地质处置低氧过渡期X65低碳钢腐蚀行为研究
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作者 刘灿帅 田朝晖 +2 位作者 张志明 王俭秋 韩恩厚 《金属学报》 SCIE EI CAS CSCD 北大核心 2019年第7期849-858,共10页
利用实验室自行搭建的低氧手套箱电化学测试体系系统,长期监测X65低碳钢在模拟地质处置过渡期80℃低氧饱和膨润土中的电化学腐蚀行为,发现X65低碳钢的开路电位在150 d内逐渐降低,阻抗模逐渐增加,腐蚀类型从初期的点蚀转变为均匀腐蚀;利... 利用实验室自行搭建的低氧手套箱电化学测试体系系统,长期监测X65低碳钢在模拟地质处置过渡期80℃低氧饱和膨润土中的电化学腐蚀行为,发现X65低碳钢的开路电位在150 d内逐渐降低,阻抗模逐渐增加,腐蚀类型从初期的点蚀转变为均匀腐蚀;利用SEM、EDS和μ-XRD表征了X65低碳钢腐蚀产物的形貌、元素组成和物相组成,发现腐蚀产物有颗粒状、片状、杆状和胞状4种类型,腐蚀产物中的元素均匀分布,产物物相由Fe3O4和α-Fe2O3组成;使用失重法测量X65低碳钢平均腐蚀速率,发现腐蚀速率(V)在150 d内逐渐从195.88μm/a降低到20.58μm/a,V随时间(t)的变化规律符合降幂函数关系式V=8.34t-0.88,腐蚀过程受扩散控制。 展开更多
关键词 地质处置 低碳钢 腐蚀 电化学 扩散
Electrochemical synthesis ofβ-hydroxy-,β-alkoxy-,andβ-carbonyloxy sulfones by vicinal difunctionalization of olefins
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作者 Zhefan Zhang Jiyao Yan +1 位作者 Dengke Ma Jianwei Sun 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第8期1509-1511,共3页
An electrochemical vicinal heterodifunctionalization of olefins for the synthesis ofβ-oxysulfones is described.With suitable choice of the conditions,including current,electrodes,and electrolyte,this oxidation reacti... An electrochemical vicinal heterodifunctionalization of olefins for the synthesis ofβ-oxysulfones is described.With suitable choice of the conditions,including current,electrodes,and electrolyte,this oxidation reaction proceeded efficiently in an undivided cell without the use of a stoichiometric chemical oxidant.In addition to the previously established synthesis ofβ-hydroxysulfones in the presence of water,minor modification of this protocol by using either external alcohol nucleophiles or internal carboxylic acid nucleophile also led to the synthesis ofβ-alkoxysulfones,andβ-sulfonyl lactones. 展开更多
关键词 OLEFINS Difunctionalization ELECTROCHEMICAL synthesis SULFONES
废铁回收利用降低铜冶炼污水处理成本 预览
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作者 陈鑫 李文勇 +2 位作者 柯建林 王官华 李志铎 《硫酸工业》 CAS 2019年第6期27-28,34共3页
介绍了中铝东南铜业公司铜冶炼污水处理流程及改进措施。利用废酸处理工序的硫化后液与废铁反应生成二价铁离子,再将大部分二价铁离子带入一段中和系统,使之与污水中的金属离子反应生成沉淀物,降低了后续工序电化学设备的铁极板消耗量,... 介绍了中铝东南铜业公司铜冶炼污水处理流程及改进措施。利用废酸处理工序的硫化后液与废铁反应生成二价铁离子,再将大部分二价铁离子带入一段中和系统,使之与污水中的金属离子反应生成沉淀物,降低了后续工序电化学设备的铁极板消耗量,从而降低污水处理成本。 展开更多
关键词 铜冶炼 污水处理 电化学 设备
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Passivity breakdown of 13Cr stainless steel under high chloride and CO2 environment 预览
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作者 Hui-xin Li Da-peng Li +3 位作者 Lei Zhang Ya-wen Wang Xiu-yun Wang Min-xu Lu 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第3期329-336,共8页
Herein, the effect of high chloride ion (Cl^-) concentration on the corrosion behavior and passive film breakdown of 13Cr martensitic stainless steel under CO2 environment was demonstrated. The Cl^- concentration was ... Herein, the effect of high chloride ion (Cl^-) concentration on the corrosion behavior and passive film breakdown of 13Cr martensitic stainless steel under CO2 environment was demonstrated. The Cl^- concentration was varied from 30 to 150 g/L and cyclic potentiodynamic polarization was conducted to investigate the influence of the Cl^- concentration on the corrosion potential (Ecorr), passive breakdown potential (Epit), and repassivation potential (Erep). The results of the polarization curves revealed that 13Cr stainless steel is susceptible to pitting under high Cl^- concentration. The passive breakdown potential and repassivation potential decreased with the increase of Cl^- concentration. The semiconducting behavior of the passive film was investigated by Mott-Schottky analysis and the point defect model (PDM). It was observed that the iron cation vacancies and oxygen vacancies were continuously generated by autocatalytic reactions and the higher Cl^- concentration resulted in higher vacancies in the passive film. Once the excess vacancies condensed at the metal/film interface, the passive film became locally detached from the metal, which led to the breakdown of the passive film. 展开更多
关键词 13Cr STAINLESS steel electrochemical characterization PITTING corrosion high CHLORIDE concentration PASSIVE film BREAKDOWN
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Corrosion behavior of Ni-based coating containing spherical tungsten carbides in hydrochloric acid solution
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作者 Shan-shan Liu Hai-yan Chen +3 位作者 Xuan Zhao Li Fan Xiao-ming Guo Yan-sheng Yin 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第2期191-199,共9页
A Ni-based alloy coating with 30 wt.%spherical fungsten carbide particles was prepared through plasma transferred arc welding on 42CrMo steel.The composition and microstructure of the coati ng were examined through X-... A Ni-based alloy coating with 30 wt.%spherical fungsten carbide particles was prepared through plasma transferred arc welding on 42CrMo steel.The composition and microstructure of the coati ng were examined through X-ray diffraction and scanning electron microscopy with energy-dispersive spectrometry.The corrosion behaviors of the coating compared to the Ni coating without tungsten carbide particles and to the bare substrate in a0.5 mol/L HC1 solution were presented through polarization curves,electrochemical impedance spectroscopy(EIS)measurements and long-term immersion tests.The results demonstrated that the composite coating microstructure comprised Ni matrix,Ni-rich phase,tungsten carbide particles,W-rich phase and Cr-rich phase.The polarization curves and EIS measurements presented that a passivation film,which mainly included Ni,Cr,Fe and W oxides,was formed in the composite coating that protected the substrate from corrosion by HC1 solution.In the immersion tests,a micro-galvanic reaction at the new-formed phases and Ni matrix interface caused severe pit corrosion and Ni matrix consumption.The debonding of Ni-rich and W-rich phases could be observed with the immersion time extension.The tungsten carbide particles and Cr-rich phase were still attached on the surface for up to 30 days. 展开更多
关键词 Plasma TRANSFERRED welding SPHERICAL TUNGSTEN CARBIDE NI-BASED coating Corrosion resistance Electrochemical impedanee spectroscopy
Sr^2+/Ni^2+掺杂钼酸镧电解质制备及性能表征
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作者 阳杰 田长安 +3 位作者 程继海 廖文浩 蒙雯 吴凡 《现代化工》 CAS CSCD 北大核心 2019年第6期121-125,共5页
采用溶胶-凝胶法制备了掺杂Sr^2+、Ni^2+的La2Mo2O9基固体电解质材料,通过扫描电镜、热重-差示扫描量热分析、X射线衍射、电化学阻抗谱等方法对样品进行测试表征。结果表明,所制备的电解质均已抑制了相变;在800℃烧结后能得到致密度高于... 采用溶胶-凝胶法制备了掺杂Sr^2+、Ni^2+的La2Mo2O9基固体电解质材料,通过扫描电镜、热重-差示扫描量热分析、X射线衍射、电化学阻抗谱等方法对样品进行测试表征。结果表明,所制备的电解质均已抑制了相变;在800℃烧结后能得到致密度高于95%的陶瓷烧结体;随着Sr^2+、Ni^2+掺杂量增加,氧离子导体电导率均呈现逐渐变小的趋势,σ(x=0.6)<σ(x=0.4)<σ(x=0.2);在温度T=800℃、掺杂Sr^2+离子摩尔比为0.2时,电导率σ[La1.8Sr0.2Mo2O8.9]=0.028 S/cm、活化能Ea=1.32eV、电导率σ[La2Mo1.8Ni0.2O8.6]=0.034 S/cm、活化能Ea=1.08 eV,其均有望应用于中低温固体氧化物燃料电池。 展开更多
关键词 钼酸镧 燃料电池 电解质 电化学 掺杂
基于快速伏安法电化学检测仪设计与实现 预览
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作者 刘鹏 邬杨波 +2 位作者 孟维强 陈庚 郭智勇 《高技术通讯》 CAS 北大核心 2019年第2期195-201,共7页
针对目前大多数便携式电化学检测仪的灵敏度低、检测速度慢、显示操作单一等现状,设计了基于快速伏安法的硬件检测平台。硬件系统包括控制器、恒电位仪电路、I/V转换电路和信号源4部分。控制器用于完成循环伏安图的显示和人机交互工作... 针对目前大多数便携式电化学检测仪的灵敏度低、检测速度慢、显示操作单一等现状,设计了基于快速伏安法的硬件检测平台。硬件系统包括控制器、恒电位仪电路、I/V转换电路和信号源4部分。控制器用于完成循环伏安图的显示和人机交互工作。恒电位仪用来保证电化学池中工作电极与参比电极电位差稳定。I/V转换电路完成电流电压的转换及信号放大。信号源产生电化学检测所需的输入信号。测试表明:信号源输出幅值分辨率高、频率精度高,恒电位仪系统输出具有较好的线性度,通过对10mmol/L二茂铁(Fe(C5H5)2)溶液检测,峰电流大小正比于扫描速率,符合系统设计要求。 展开更多
关键词 硬件检测平台 快速伏安法 恒电位仪 电化学 信号源
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