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Microstructure and depositional mechanism of Ni-P coatings with nano-ceria particles by pulse electrodeposition 认领 引用 被引量：4
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作者 周小卫 沈以赴 +1 位作者 靳惠明 郑莹莹 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期1981-1988,共8页
Nano-CeO2 （RE） particles were co-deposited into Ni-P binary composite coatings by applying pulse current （PC） under ultrasonic （U） field. Morphology, chemical content and crystal microstructure were characterize... Nano-CeO2 （RE） particles were co-deposited into Ni-P binary composite coatings by applying pulse current （PC） under ultrasonic （U） field. Morphology, chemical content and crystal microstructure were characterized by environmental scanning electron microscopy （E-SEM） with energy dispersive X-ray analysis （EDXA）, XRD diffractometry and transmission electron microscopy （TEM）. Experimental results show that Ni-P coating reinforced with 15g/L nano-CeO2, in amorphous state and with compact structure, can be improved in the microhardness from HV0.2580 to HV0.2780 by annealing at 600 °C for 2 h. The highest content of codeposited Ce and deposition rate can reach 2.3% and 68 μm/h, respectively. Furthermore, the effect of RE adsorption and pulse overpotential on depositional mechanism was investigated. n-CeO2 particles or Ce4＋ ions with strong adsorption capacity acted as the catalytic nucleus to improve densification effectively. During annealing at 600 °C for 2 h, n-CeO2 particles will uniformly adsorb on crystal grain to preferentially pad and heal up gaps of cracking Ni boundaries, promoting dispersion strengthening with refiner-grained structure. 展开更多
关键词 Ni-P coating pulse electrodeposition overpotential depositional mechanism CeO2
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Study on characteristics of Ni-W-B composites containing CeO_2 nano-particles prepared by pulse electrodeposition 认领 引用 被引量：5
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作者 WANG Junli XU Ruidong ZHANG Yuzhi 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第1期43-47,共5页
Ni-W-B composites containing CeO2 nano-particles on the surface of 45 steel were prepared by pulse electrodeposition,and the in-fluence of pulse frequency,pulse duty circle and heat treatment temperature on the struct... Ni-W-B composites containing CeO2 nano-particles on the surface of 45 steel were prepared by pulse electrodeposition,and the in-fluence of pulse frequency,pulse duty circle and heat treatment temperature on the structures and properties were investigated.The results in-dicated that the pulse co-deposition of Ni,W,B and CeO2 nano-particles led to Ni-W-B/CeO2 composites possessing higher microhardness and better wear resistance when heat-treated at 400 oC for 1 h.The microhardness of 636 HV and the deposition rate of 0.0281 mm/h of the as-deposited alloy were the highest at pulse frequency of 1000 Hz,pulse duty circle of 10% and pulse average current density of 10 A/dm2.The composites were mainly in the amorphous state and were partially crystallized as-deposited,and the crystallization trend was strength-ened when heat-treated at 400 oC.Decreasing pulse duty cycle from 75% to 10% was favorable to the refinement in grain structures and im-provement of microstructures.The crystal sizes of the composites were smaller by means of pulse electrodeposition. 展开更多
关键词 pulse electrodeposition composites characteristics rare earths
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Influence of SiO_2 nano-particles on microstructures and properties of Ni-W-P/CeO_2-SiO_2 composites prepared by pulse electrodeposition 认领 引用 被引量：3
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作者 王军丽 徐瑞东 章俞之 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第5期839-843,共5页
Ni-W-P base composites containing CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by pulse co-deposition of Ni,W,P,CeO2 and SiO2 nano-particles.The influence of SiO2 concentrations in bath on... Ni-W-P base composites containing CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by pulse co-deposition of Ni,W,P,CeO2 and SiO2 nano-particles.The influence of SiO2 concentrations in bath on microstructures and properties of Ni-W-P/CeO2-SiO2 composites was studied,and the characteristics were assessed by chemical compositions,element distribution,surface morphologies,deposition rate and microhardness.The results indicate that when SiO2 concentration in bath is controlled at 20 g/L,the composites possess the fastest deposition rate,the highest microhardness,compact microstructures,smaller crystallite sizes and uniform distribution of W,P,Ce and Si within Ni-W-P matrix metal.Increasing SiO2 concentration in bath from 10 to 20 g/L leads to the refinement in grain size and the inhomogeneity of microstructures.While when SiO2 concentration is increased to 30 g/L,the crystallite sizes increase again and some bosses with nodulation shape appear on the surface of composites. 展开更多
关键词 pulse electrodeposition nano-particle composite microstructure and property
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In vitro biodegradability and biocompatibility of porous Mg-Zn scaffolds coated with nano hydroxyapatite via pulse electrodeposition 认领 引用 被引量：3
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作者 Z.S.SEYEDRAOUFI Sh.MIRDAMADI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第12期4018-4027,共10页
The biodegradability and biocompatibility of porous Mg-2Zn（mass fraction, %） scaffolds coated with nano hydroxyapatite（HAP） were investigated. The nano HAP coating on Mg-2Zn scaffolds was prepared by the pulse ele... The biodegradability and biocompatibility of porous Mg-2Zn（mass fraction, %） scaffolds coated with nano hydroxyapatite（HAP） were investigated. The nano HAP coating on Mg-2Zn scaffolds was prepared by the pulse electrodeposition method. The as-deposited scaffolds were then post-treated with alkaline solution to improve the biodegradation behavior and biocompatibility for implant applications. The microstructure and composition of scaffold and nano HAP coating, as well as their degradation and cytotoxicity behavior in simulated body fluid（SBF） were investigated. The post-treated coating is composed of needle-like HAP with the diameter less than 100 nm developed almost perpendicularly to the substrate, which exhibits a similar composition to natural bone. It is found that the products of immersion in SBF are identified to be HAP,（Ca,Mg）3（PO4）2 and Mg（OH）2. The bioactivity, biocompatibility and cell viabilities for the as-coated and post-treated scaffold extracts are higher than those for the uncoated scaffold. MG63 cells are found to adhere and proliferate on the surface of the as-coated and post-treated scaffolds, making it a promising choice for medical application. The results show that the pulse electrodeposition of nano HAP coating and alkaline treatment is a useful approach to improve the biodegradability and bioactivity of porous Mg-Zn scaffolds. 展开更多
关键词 porous Mg-Zn scaffold hydroxyapatite coating pulse electrodeposition biodegradability biocompatibility
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Effect of bath composition and pulse electrodeposition condition on characteristics and microhardness of cobalt coatings 认领 引用 被引量：6
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作者 S.MAHDAVI S.R.ALLAHKARAM 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第10期2017-2027,共11页
Nanocrystalline cobalt coatings were produced from cobalt sulfate based electrolytes by using pulse current electrodeposition technique.The effects of bath composition and electrodeposition condition on current effici... Nanocrystalline cobalt coatings were produced from cobalt sulfate based electrolytes by using pulse current electrodeposition technique.The effects of bath composition and electrodeposition condition on current efficiency,morphology,structure and hardness of the coatings were investigated and the optimum deposition condition was determined.It was found that increment of cobalt sulfate concentration and sodium dodecyl sulfate(SDS)concentration in the bath had a negligible effect on microhardness of the coatings,while they were effective on electrodeposition current efficiency.Adding saccharin to electrodeposition bath decreased crystallite size of hexagonal close-packed(hcp)cobalt films and increased their microhardness without significant effect on current efficiency.Smoother and less defective coatings were also obtained from baths containing SDS and saccharin.The results revealed that both the current efficiency and microhardness were changed by variation of peak current density and duty cycle.Besides change of smooth morphology of the coatings to needle-shaped one,crystallite sizes and preferred orientation also varied with increasing the current density and duty cycle. 展开更多
关键词 cobalt coating pulse electrodeposition saccharin sodium dodecyl sulfate characterization current efficiency microhardness
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Novel Nanostructured MnO_2 Prepared by Pulse Electrodeposition:Characterization and Electrokinetics 认领 引用 被引量：2
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作者 H.Adelkhani M.Ghaemi S.M.Jafari 《Journal of Materials Science & Technology》 SCIE EI CAS 2008年第6期857-862,共6页
Pulse current technique was applied for the preparation of novel electroactive manganese dioxide and possible influences of different electrokinetic phenomena on material characteristics were discussed. The characteri... Pulse current technique was applied for the preparation of novel electroactive manganese dioxide and possible influences of different electrokinetic phenomena on material characteristics were discussed. The characterizations of pulse deposited sample （pcMD） were carried out by different techniques： Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET） method, Raman spectroscopy, and atomic force microscopy （AFM）. SEM image revealed that pulse current could improve the current distribution. This was confirmed by AFM images showing a decrease in surface roughness of pcMDs in comparison to amorphous samples, which were deposited by direct current （dcMD）. Higher distortion of MnO6 octahedral environment of dcMD was detected by FTJR and Raman spectroscopy. Cyclic voltammetric （CV） measurements showed a generally higher energy level drained from the second electron discharge of pcMD. This is mainly attributed to a higher surface area and a lower diffusion pass of electrons and protons arisen via a rather unique nanostructural arrangement of pcMD grains. Results indicate a higher surface area available for the non homogenous second electron discharge of pcMD grains. 展开更多
关键词 Manganese dioxide Pulse electrodeposition Nano-structures Electrocrystallization
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Pulse Electrodeposition and Nanoindentation Test of ZrO2/Ni Nanocomposite 认领 引用 被引量：3
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作者 DING Shui ZHANG Kaifeng WANG Changli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第3期462-465,共4页
ZrO2/Ni nanocomposite was produced via pulse electrodeposition using a nickel sulfmate bath.The effects of main factors including pH value,temperature T,current density Dk and ZrO2 content p on the electrodeposit were... ZrO2/Ni nanocomposite was produced via pulse electrodeposition using a nickel sulfmate bath.The effects of main factors including pH value,temperature T,current density Dk and ZrO2 content p on the electrodeposit were dealt with by the Taguchi method.Experimental results show that the current density and ZrO2 content affect the electrodepositing process significantly.Nanocomposite with an average grain size of about 50 nm and ZrO2 content of up to 0.4 wt%was produced under the optimal condition.The Young's modulus of the achieved composite is similar to that of polycrystalline Ni.The microhardness is much higher than that of common pure Ni,primarily due to the ultrafine grains of Ni matrix by the Hall-Petch mechanism.The homogeneous dispersion of stiff ZrO2 particles in the Ni matrix acting as dislocation pinning and microcrack pinning also results in the strengthening effect. 展开更多
关键词 pulsed electrodeposition nickel zirconia nanocomposite nanoindentation
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Study on the Structures and Properties of Ni-W-B-CeO_2 Composite Coatings Prepared by Pulse Electrodeposition 认领 引用 被引量：1
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作者 徐瑞东 王军丽 +1 位作者 郭忠诚 王华 《Journal of Rare Earths》 SCIE EI CAS 2007年第S2期76-80,共5页
The aim of this research is to pulse co-deposit nano-CeO2 particles into Ni-W-B alloy coatings in order to improve the surface properties. The influence of pulse frequency and duty circle on deposition rate, microhard... The aim of this research is to pulse co-deposit nano-CeO2 particles into Ni-W-B alloy coatings in order to improve the surface properties. The influence of pulse frequency and duty circle on deposition rate, microhardness and microstructures, and the influence of heat treatment temperature on phase structures, microhardness and abrasivity of Ni-W-B-CeO2 composite coatings were investigated. The results indicated that the pulse co-deposition of nickel, tungsten, boron and nano-CeO2 particle from the bath which nano-CeO2 particle was suspended by high speed mechanical stirring led to the Ni-W-B-CeO2 composite coatings, possessing better microhardness and abrasion resistance when heat-treated at 400 ℃ for 1 h. The microhardness as-deposited with 636 Hz and the deposition rate with 0.0281 mm·h-1 was the highest at pulse frequency with 1000 Hz and pulse duty circle with 10%. Microstructures analysis displays that decreasing pulse duty cycle leads to refinement in grain structures and the improvement of microstructures. X-ray diffraction shows that the composite coating as-deposited was mainly in the amorphous state and partially crystallized, but when heat treated at 400 ℃, the crystallization trend was strengthened further. 展开更多
关键词 pulse electrodeposition composite coatings deposition rate microhardness microstructures rare earths
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Coupling regulation for achieving high-efficient UOR performance of amorphous Ni-P catalyst by pulse electrodeposition 认领 引用 被引量：1
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作者 Chaoqun Pei Yuyang Qian +5 位作者 Shuangqin Chen Jing Hu Shangshu Wu Mingjie Zhou Baoan Sun Tao Feng 《Science China Materials》 SCIE EI CAS CSCD 2025年第3期820-829,共10页
The pursuit of highly efficient catalysts for the urea oxidation reaction(UOR)represents a pivotal and sustainable approach to the generation of renewable energy.Structural regulation has emerged as a particularly eff... The pursuit of highly efficient catalysts for the urea oxidation reaction(UOR)represents a pivotal and sustainable approach to the generation of renewable energy.Structural regulation has emerged as a particularly effective approach to achieving superior catalytic performance.However,in the realm of amorphous catalysts with disordered structure and remarkable catalytic potential,identifying effective regulation strategies to enhance the UOR performance remains a formidable yet critical challenge.In this study,we present a coupling modulation strategy based on the growth mode and pulse current,utilizing pulse electrodeposition(PED)to achieve amorphous Ni-P catalysts with high-efficiency UOR performance.Amorphous Ni/Ni-P catalyst engineered by Stranski-Krastanov(SK)growth mode along with low pulse current exhibits unprecedented catalytic activity for UOR,as evidenced by its overpotential of 1.35 V at 10 mA/cm2 and 1.37 V@100 mA/cm2.We reveal the regulation-relationship among the growth modes,catalyst structure and UOR performance by PED.We also show that low-pulse current can efficiently enhance UOR performance by elevating energy states in amorphous Ni-P,and further demonstrate the broad applicability across diverse growth modes.Therefore,by integrating film growth modes with a pulse current,we have established a novel method for significantly enhancing catalytic performance,setting the stage for the advancement of superior catalysts. 展开更多
关键词 metallic glass catalyst pulsed electrodeposition structure regulation urea oxidation reaction
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Pulse electrodeposited NiMoZn alloy hydrophobicized with PTFE for high performance alkaline water electrolysis 认领 引用
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作者 Yuan Sheng Wenxing Zhu +3 位作者 Zhijian Li Shuo Li Liangbin Shao Jianguo Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第10期254-266,共13页
Green hydrogen production by alkaline water electrolysis is an important technology in the decarbonization of the current industry.However,its large-scale application is limited by mediocre performance of conventional... Green hydrogen production by alkaline water electrolysis is an important technology in the decarbonization of the current industry.However,its large-scale application is limited by mediocre performance of conventional Raney Ni electrocatalysts.Herein,high-performance NiMoZn alloy catalysts of the Raney Ni type are developed by pulse electrodeposition for the hydrogen evolution reaction(HER).The optimized catalyst,NMZ-CA,exhibits an overpotential of 37 mV at 10 mA·cm-2 and a Tafel slope of 27 mV·dec-1 in 1 mol·L-1 KOH.Tafel slope measurements,X-ray photoelectron spectroscopy,and H2 temperatureprogrammed desorption experiments show that the incorporation of Mo and Zn in Ni weakens the binding of HER intermediate(Hads)on strongly adsorbing sites,leading to improved electrochemical kinetics.Electron microscopy and X-ray diffraction study reveals that a phase-pure Mo-doped Ni2Zn11 intermetallic precatalyst formed via pulse electrodeposition and subsequent heat treatment is key to the structure integrity and performance of the catalyst after activation by alkaline leaching.Modificationof NMZ-CA with PTFE enhances its HER performance by facilitating gas removal and improving structure integrity.A practical alkaline water electrolyzer built on the modifiedNMZ/PTFE-CA electrode delivers 2.0 A·cm-2 at 1.92 V cell voltage and operates for 250 h without decay.This work provides insights into the synergy between Ni,Mo,and Zn in Raney Ni-type catalysts,and demonstrates the hydrophobic modification as an effective strategy for electrode development in high-performance alkaline water electrolysis. 展开更多
关键词 Hydrogen production Electrolysis Non-noble metal High current density Stability Pulse electrodeposition
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Electrodeposition and characterization of nanocrystalline Fe-Ni-Cr alloy coatings synthesized via pulse current method 认领 引用 被引量：5
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作者 Ebrahim YOUSEFI Ahmad IRANNEJAD Shahriar SHARAFI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第12期2591-2603,共13页
The nanocrystalline Fe-Ni-Cr coatings were electrodeposited by using the pulse current technique.The SEM results showed that the coatings had a mixed morphology of small nodules and fine cauliflower structures at low ... The nanocrystalline Fe-Ni-Cr coatings were electrodeposited by using the pulse current technique.The SEM results showed that the coatings had a mixed morphology of small nodules and fine cauliflower structures at low current densities.Also,the Cr content was increased at expense of Fe and Ni contents at high current densities.XRD patterns confirmed that the pulse current density had a positive effect on the grain refinement.The results of vibrating sample magnetometer(VSM)measurements demonstrated that by increasing the current density,the saturation magnetization was decreased and the coercivity was increased due to the enhancement of Cr content and the reduction of the grain size.The friction coefficient and wear rate values were decreased by increasing the pulse current density.Also,both the adhesive and abrasive wear mechanisms were observed on the worn surfaces.The abrasive grooves and the amount of wear debris were decreased by increasing the pulse current density. 展开更多
关键词 pulse electrodeposition current density nanocrystalline Fe-Ni-Cr coatings magnetic behavior tribological properties
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Microstructure and properties of nanocrystalline nickel coatings prepared by pulse jet electrodeposition 认领 引用 被引量：19
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作者 田宗军 王东生 +3 位作者 王桂峰 沈理达 刘志东 黄因慧 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第6期1037-1042,共6页
The fabrication of nanocrystalline nickel coatings was conducted by pulse jet electrodeposition on the substrate of 45# carbon steel.The effects of average current density on the surface morphology,microstructure,aver... The fabrication of nanocrystalline nickel coatings was conducted by pulse jet electrodeposition on the substrate of 45# carbon steel.The effects of average current density on the surface morphology,microstructure,average grain size and microhardness of nickel coatings were investigated by scanning electron microscopy(SEM),X-ray diffractometry(XRD)and microhardness measurement.In addition,the corrosion resistances of coating and substrate were compared.It is revealed that the nickel coatings prepared by pulse jet electrodeposition exhibit a fine-grained structure with a smooth surface and a high density,although some pores and defects are still present in coatings.With the increase of average current density,the average grain size of nickel coatings is reduced at first and then increased.The coating with the optimum compactness,the smallest average grain size(13.7 nm)and the highest microhardness are obtained at current density of 39.8 A/dm2.The corrosion resistance is obviously increased for the coatings prepared by pulse jet electrodeposition;however,the corrosion rate is increased after a certain period due to the penetration of the corrosive media. 展开更多
关键词 pulse jet electrodeposition nanocrystalline nickel coating microstructure microhardness corrosion resistance
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Preparation of SnS∶Ag Thin Films by Pulse Electrodeposition 认领 引用
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作者 杨永丽 程树英 《Journal of Semiconductors》 CAS 北大核心 2008年第12期2322-2325,共4页
SnS：Ag thin films were deposited on ITO by pulse electro-deposition. They were characterized with X-ray diffraction spectroscopy and atomic force microscope. The as-deposited films have a new phase （Ag8SnS6） with g... SnS：Ag thin films were deposited on ITO by pulse electro-deposition. They were characterized with X-ray diffraction spectroscopy and atomic force microscope. The as-deposited films have a new phase （Ag8SnS6） with good crystallization and big grain size. The conductivity of the films was measured by photoelectrochemical test. It is proved that the SnS：Ag films are p-type of semiconductor. Hall measurement shows that the carrier concentration of the films increases, while their resistivity decreases after Ag-doping. 展开更多
关键词 pulse electrodeposition SnS：Ag thin films electrical and optical properties
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Effect of Rare Earth on Microstructure and Corrosion Resistance of Pulse Reversal Current Electrodeposition Ni-Co Alloy Coatings 认领 引用 被引量：1
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作者 常立民 安茂忠 马明硕 《Journal of Rare Earths》 SCIE EI CAS 2005年第S1期403-406,共4页
The effect of adding RE to plating bath on microstructure and corrosion resistance of Ni-Co alloy coatings prepared by pulse reversal current electrodeposition was studied by means of SEM/EDS, electrochemical analysis... The effect of adding RE to plating bath on microstructure and corrosion resistance of Ni-Co alloy coatings prepared by pulse reversal current electrodeposition was studied by means of SEM/EDS, electrochemical analysis and corrosion mass loss etc. The results show that adding proper RE to plating solution can promote the microstructure of coatings compacter, the surface smoother and the crystal finer, and improve the corrosion resistance. The coatings exhibite the highest corrosion resistance when the concentration of RE reaches 0.25 g·L -1. The reason of increasing corrosion resistance by adding RE was also investigated. 展开更多
关键词 Ni-Co alloy coatings pulse reversal current electrodeposition corrosion resistance rare earths
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Effect of Duty Cycle on Properties of Pulse-electro-deposited SnS:Ag Thin Films 认领 引用 被引量：1
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作者 LU Peimin JIA Hongjie +1 位作者 YANG Yongi CHENG Shuying 《Semiconductor Photonics and Technology》 2010年第4期132-136,145,共5页
SnS∶Ag thin films were deposited on ITO glasses by pulse electro-deposition.By studying the effect of duty cycle on the properties of SnS∶Ag thin films,the optimum off-time(toff)is obtained to be 5 s,namely,the opti... SnS∶Ag thin films were deposited on ITO glasses by pulse electro-deposition.By studying the effect of duty cycle on the properties of SnS∶Ag thin films,the optimum off-time(toff)is obtained to be 5 s,namely,the optimal duty cycle is about 67%.The primary phase of SnS∶Ag films deposited on optimum parameters condition is SnS compound with good crystallization,and the films prefer to grow towards(111)plane.The films are dense,smooth and uniform with good microstructure,and the grains in the films are densely packed together,and their direct bandgap is about 1.40 eV.In addition,the bandgap of the films first rises and then drops with the increase of the duty cycle. 展开更多
关键词 duty cycle pulse electrodeposition SnS∶Ag thin films optical properties
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Probe into deposition mechanism of double pulse electrodepositing Ni-W-P matrix composite coatings containing CeO_2 and SiO_2 nano-particles 认领 引用 被引量：3
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作者 王军丽 章俞之 +1 位作者 徐瑞东 詹鹏 《Journal of Rare Earths》 SCIE EI CAS 2010年第S1期437-441,共5页
Ni-W-P matrix composite coatings reinforced by CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by double pulse electrodeposition and the deposition mechanism was discussed.The results showed ... Ni-W-P matrix composite coatings reinforced by CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by double pulse electrodeposition and the deposition mechanism was discussed.The results showed that the composite coatings with amorphous structure were obtained as-deposited.The initial growth behavior had alternatives and the nucleation was inhomogeneous because of obvious composition fluctuation.With the pulse deposition time increasing,some pearlite microstructures of the substrate were covered by some deposits and the composition fluctuation disappeared.Forward pulse currents promoted to form a great number of atomic beams composed of Ni,W and P atoms or CeO2 and SiO2 nano-particles as the core,which inhabited the growth of atomic beams.Reverse pulse currents eliminated concentration polarization and dissolved some surface boss of atomic beams.The solution of W and P atoms within Ni grains and embedding of CeO2 and SiO2 nano-particles within Ni-W-P matrix metal made atomic arrangement disordered.Finally,the atomic beams grew to amorphous small particles. 展开更多
关键词 double pulse electrodeposition metal matrix composite coatings nano-particles deposition mechanism rare earths
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Effects of rare earth on microstructures and properties of Ni-W-P-CeO_2-SiO_2 nano-composite coatings 认领 引用 被引量：14
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作者 徐瑞东 王军丽 +1 位作者 郭忠诚 王华 《Journal of Rare Earths》 SCIE EI CAS 2008年第4期579-583,共5页
Ni-W-P-CeO2-SiO2 nano-composite coatings were prepared on common carbon steel surface by pulse electrodeposition of nickel, tungsten, phosphorus, rare earth （nano-CeO2） and silicon carbide （nano-SiO2） particles. T... Ni-W-P-CeO2-SiO2 nano-composite coatings were prepared on common carbon steel surface by pulse electrodeposition of nickel, tungsten, phosphorus, rare earth （nano-CeO2） and silicon carbide （nano-SiO2） particles. The effects of nano-CeO2 concentrations in electrolyte on microstructures and properties of nano-composite coatings were studied. The samples were characterized with chemical compositions, elements distributions, microhardness and microstructures. The results indicated that when nano-CeO2 concentration was controlled at 10 g/L, the nano-composite coatings possessed higher microhardness and compact microstmctures with clear outline of spherical matrix metal crystallites, fine crystallite sizes and uniform distribution of elements W, P, Ce and Si within the Ni-W-P matrix metal. Increasing the nano-CeO2 particles concentrations from 4 to 10 g/L led to refinement in grain structure and improvement of microstructures, while when increased to 14 g/L, the crystallite sizes began to increase again and there were a lot of small boss with nodulation shape appearing on the nano-composite coatings surface. 展开更多
关键词 pulse electrodeposition nano-composite coatings deposition rate microhardness microstructures rare earths
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Effects of polyaniline on electrochemical properties of composite inert anodes used in zinc electrowinning 认领 引用 被引量：11
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作者 詹鹏 徐瑞东 +2 位作者 黄利平 陈步明 周建峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1693-1700,共8页
In order to search for a suitable anode material used in zinc electrowinning in place of Pb-Ag alloy,Al/Pb-PANI（polyaniline）-WC（tungsten carbide） composite inert anodes were prepared on aluminum alloy substrate by... In order to search for a suitable anode material used in zinc electrowinning in place of Pb-Ag alloy,Al/Pb-PANI（polyaniline）-WC（tungsten carbide） composite inert anodes were prepared on aluminum alloy substrate by double pulse electrodeposition（DPE） of PANI and WC particles with Pb2＋ from an original plating bath.Thereafter,anodic polarization curves,cyclic voltammetry curves and Tafel polarization curves for the composite inert anodes obtained under different PANI concentrations in the original plating bath were measured,and the microstructural features were also investigated by scanning electron microscopy（SEM）.The results show that Al/Pb-PANI-WC composite inert anode obtained under PANI concentration of 20 g/L in the original plating bath possesses uniform microstructures and composition distributions,higher electrocatalytic activity,better reversibility of electrode reaction and corrosion resistance in a synthetic zinc electrowinning electrolyte of 50 g/L Zn2＋,150 g/L H2SO4 at 35 °C.Compared with Pb-1%Ag alloy,the overpotential of oxygen evolutions for the composite inert anode are decreased by 185 mV and 166 mV,respectively,under 500 A/m2 and 1000 A/m2. 展开更多
关键词 composite inert anodes double pulse electrodeposition anodic polarization curves cyclic voltammetry curves Tafel polarization curves microstructures
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Crystallization characteristics of Ni-W-P composite coatings reinforced by CeO_2 and SiO_2 nano-particles 认领 引用 被引量：2
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作者 徐瑞东 翟大成 章俞之 《Journal of Central South University》 SCIE EI CAS 2014年第12期4424-4431,共8页
Ni-W-P composite coatings reinforced by Ce O2 and Si O2 nano-particles on the surface of common carbon steels, were prepared by double pulse electrodeposition. The crystallization course was characterized by phase str... Ni-W-P composite coatings reinforced by Ce O2 and Si O2 nano-particles on the surface of common carbon steels, were prepared by double pulse electrodeposition. The crystallization course was characterized by phase structures, crystallinity, grain sizes and microstructures. The results indicate that as-deposited composite coating is amorphous. Whereas it turns into the crystalline structure with 98.25% crystallinity, and Ni3 P, Ni2 P and Ni5P2 alloy phases precipitate from structures at 400 °C. Thereafter, Ni2 P and Ni5P2 metastable alloy phases turn into Ni3 P stable alloy phase at 500 °C. The crystallization course of the composite coating has finished when being heat-treated at 700 °C. The average sizes of Ni grains increase with the rise of heat treatment temperature from400 °C to 700 °C. Ce O2 and Si O2 nano-particles deposited into Ni-W-P alloys can delay the crystallization course and habit the growth of alloy phases. 展开更多
关键词 composite coating double pulse electrodeposition Ni-W-P nano-particles crystallization characteristics
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Effect of Microstructures on Corrosion Behavior of Nickel Coatings:(Ⅰ) Abnormal Grain Size Effect on Corrosion Behavior 认领 引用 被引量：5
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作者 Guozhe Meng Yang Li +6 位作者 Yawei Shao Tao Zhang Yanqiu Wang Fuhui Wang Xuequn Cheng Chaofang Dong Xiaogang Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2015年第12期1186-1192,共7页
Nickel coatings with different microstructures were synthesized by pulse jet electrodeposition technique.Their morphology and microstructure were investigated by scanning electron microscopy（SEM）and transmission ele... Nickel coatings with different microstructures were synthesized by pulse jet electrodeposition technique.Their morphology and microstructure were investigated by scanning electron microscopy（SEM）and transmission electron microscopy（TEM）.The corrosion property of the coatings was studied by using polarization,electrochemical impedance spectroscopy（EIS）,potential of zero free charge（PZFC） measurements and Mott-Schottky（M-S） relationship.The results showed that the coating with grain size of 50 nm possessed higher corrosion resistance than that with grain size of 10 nm.This abnormal behavior may be related to the existence of nanoscale twins in the coatings and the lower concentration of acceptor in the passive films. 展开更多
关键词 Nanocrystalline Pulse jet electrodeposition Corrosion Grain size Growth twins
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