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electroless nickel fabrication on surface modified magnesium substrates

Defence Technology（防务技术） 2019年第4期15卷 636-644页

作者： Ayushi Thakur Swaroop Gharde Balasubramanian Kandasubramanian Department of Metallurgical and Materials Engineering National Institute of Technology Hazratbal Srinagar Jammu & Kashmir 190006 India Department of Metallurgical & Materials Engineering DIAT (DU) Ministry of Defence Girinagar Pune 411025 Maharashtra India

In recent years,magnesium(Mg)has evolved as a salient material,in affiliation with electroless nickel(Ni)coating,which have found applications in automobiles,aerospace and confederate fields attributing to its excellent inherent weight sensitive ***,being acknowledged for its remarkable auxiliary properties like flexible machining,appreciable weight sensitivity and ability to be patently diecast into mesh constructs,magnesium is prejudiced by aeronautical standards predominantly for its inferior corrosion resistance *** this sense,electroless nickel plating on magnesium and its alloys has been suggested to extricate it from corrosion problem and make it more competitive in industrial and defence *** fixation of metal ions onto respective substrates accrues and alters their mechanical,electrochemical and tribological properties,destitute of any electric current *** proficiently identified technique is prosecuted with the assistance of a series of sequenced operations involving a prior pretreatment,which corresponds to the chemical cleaning of the substrate surface;electroless coating;and a later activation process which is a mild etching of the electroless coated *** susceptibility of magnesium to this methodology has advanced and propagated its exercise and applicability in aircraft,satellites and allied aeronautical ***,researchers have proposed various eco-friendly and modified duplex and composite coatings which have transmuted properties of these appendages by tailoring alloy compositions and reagents *** review article systematically colligates various considerations and evaluations on electroless nickel applications of magnesium and its alloys and explicates how it anchors its practice in the respective ***,a comprehensive analysis is devised based on the pre-existing treatment methods for accomplishing the same.

关键词： electroless nickel plating Magnesium Magnesium alloys Corrosion-resistance Micro arc oxidation(MAO)

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electroless plating of Ni-Zn(Fe)-P alloy on carbon steel sheets

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中国有色金属学会会刊：英文版 2004年第z1期14卷 157-161页

作者： WANG Sen-lin WU Hui-huang College of Materials Science and Engineering Huaqiao University Quanzhou 362021 China State Key Laboratory for Physical Chemistry of Solid Surface Department of ChemistryXiamen University Xiamen 361005 China State Key Laboratory for Physical Chemistry of Solid Surface Department of ChemistryXiamen University Xiamen 361005 China

The autocatalytic deposition of Ni-Zn(Fe)-P alloys were carried out on carbon steel sheets from bath containing nickel sulfate, zinc sulfate, sodium hypophosphite, sodium citrate and boric acid. The effects of pH and mole ratio of NiSO4/ZnSO4 on the deposition rate and the composition of deposit were studied. It is found that the presence of zinc sulfate in the bath has an inhibitory effect on the alloy deposition. As a consequence, the mole fraction of zinc in the deposits never reaches high value, which is less than 18.0%. The structure and surface morphology of Ni-Zn(Fe)-P coatings were charactered by XRD and SEM. The alloys plated at all conditions consist of amorphous phase coexisting with a crystalline cubic Ni phase. The surface morphology of coating is dependent on the deposition parameters.

关键词： electroless plating nickel zinc

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electroless deposition of Ni on template of halloysite and its magnetic property

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中国有色金属学会会刊：英文版 2004年第z1期14卷 152-156页

作者： FU Yu-bin ZHANG Li-de ZHENG Ji-yong Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Luoyang Ship Material Research Institute Luoyang 471039 China Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Luoyang Ship Material Research Institute Luoyang 471039 China

Halloysite template, a ceramic substrate, is of a hollow cylindric structure, on which the fine Pd nanoparticles are uniformly formed by the reduction of palldate chloride to initiate electroless deposition. The electroless deposition of Ni is catalyzed by the Pd particles, which results in a uniform layer of Ni-P alloy on halloysite. The alloy is of a nanocrystalline structure, of which the average diameter is about 6 nm. After being heat-treated at 400 ℃, it contains both Ni and Ni12P5 crystal, meanwhile, the Ni crystal gets larger with an average size of 51.9 *** content of phosphorous in the Ni layer has a great influence on crystal structure. The metallized halloysite has a higher inherent coercive force, and a much lower saturation magnetization in its as-plated state, while after heattreatment, the inherent coercive force decreases drastically. These magnetic properties have great relationship with the superparamagnetism of Ni nanocrystalline and the stress anisotropy in Ni layer.

关键词： halloysite template electroless deposition Ni nanocrystalline inherent coercive force

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electroless deposition of Au nanoparticles on reduced graphene oxide/polyimide film for electrochemical detection of hydroquinone and catechol

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Frontiers of Materials Science 2017年第3期11卷 262-270页

作者： Xuan SHEN Xiaohong XIA Yongling DU Chunming WANG College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China

An electrochemical sensor for determination of hydroquinone （HQ） and catechol （CC） was developed using Au nanoparticles （AuNPs） fabricated on reduced graphene oxide/polyimide （PIIRGO） film by electroless deposition. The electrochemical behaviors of HQ and CC at PIIRGO-AuNPs electrode were investigated by cyclic voltammetry （CV） and differential pulse voltammetry （DPV）. Under the optimized condition, the current responses at PI/RGO-AuNPs electrode were linear over ranges from 1 to 654 mol/L for HQ and from 2 to 1289 mol/L for CC, with the detection limits of 0.09 and 0.2 mollL, respectively. The proposed electrode exhibited good reproducibility, stability and selectivity. In addition, the proposed electrode was successfully applied in the determination of HQ and CC in tap water and the Yellow River samples.

关键词： electroless Au nanoparticles hydroquinone catechol sensor

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Optimizing electroless Plating of Ni-Mo-P Coatings Toward Functional Ceramics

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 437-445页

作者： N.Ma.Rosas-Laverde A.Pruna J.Cembrero M.Pascual J.Orozco-Messana Department of Materials and Mechanical Engineering Universitat Politecnica de ValenciaValenciaSpain Department of Materials Escuela Politecnica NacionalQuitoEcuador Center for Surface Science and Nanotechnology Polytechnic University of BucharestBucharestRomania Instituto de Tecnologia de Materiales Universitat Politecnica de ValenciaValenciaSpain

Ni-Mo-P coatings are obtained at the surface of ceramic substrate by electroless deposition using palladium as a surface *** influence of catalyst activation conditions on coatings’ properties was assessed by structural,morphological,electrical,mechanical measurements and adhesion strength by using X-ray diffraction,field emission scanning electron microscopy,atomic force microscopy,Hall effect and nanoindentation techniques,*** results indicated the formation of dense,continuous and uniform coatings consisting mainly of *** coatings obtained at 300℃for 12 h exhibited the best electrical properties,namely resistivity of 9.32 μΩ cm,smaller roughness(Ra 0.090 μm) and average mechanical *** adhesion tests showed a firm adherence of the Ni-Mo-P coatings to the ceramic *** results of this study could offer an approach for obtaining conducting ceramic substrates in order to be employed in photovoltaic *** performance of demonstrative heterojunction solar cell obtained with such metallized ceramic is indicative of the high potential of the Ni-Mo-P electroless coatings for functional ceramics.

关键词： electroless plating Ni-Mo-P Ceramic Solar cell

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Highly sensitive and selective electrochemical immunosensors by substrate-enhanced electroless deposition of metal nanoparticles onto three-dimensional graphene@Ni foams

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Science Bulletin 2019年第17期64卷 1272-1279页

作者： Changrong Zhao Xiaoli Li Shixia An Dongliang Zheng Shuaili Pei Xiao Zheng Yu Liu Qingqing Yao Mei Yang Liming Dai Institute of Advanced Materials for Nano-Bio Applications School of Ophthalmology ■ Optometry Wenzhou Medical University Wenzhou 325027 China Department of Macromolecule Science and Engineering Case Western Reserve University Cleveland OH 44106 USA

In this study, we have for the first time preformed the facile substrate-enhanced electroless deposition(SEED) of metal nanoparticles onto monolithic graphene@Ni foams for construction of disposable three-dimensional(3 D) electrochemical immunosensors. Specifically, we firstly used the SEED method to deposit gold nanoparticles(AuNPs) onto the graphene@Ni foam for immobilization of antibody(Ab1). This is followed by a second step SEED deposition to produce silver nanoparticles(AgNPs) for electrochemical stripping detection. Using a-fetoprotein antigen(AFP) as a module analyte, the newly-developed sensor showed a wide linear response, ranging from 5.0 pg/mL to 5.0 ng/mL and a low detection limit down to 2.3 pg/mL. The newly-developed 3 D-immunosensor is sensitive, reliable,and easy to be fabricated, showing great potential for clinic applications.

关键词： Electrochemical immunosensor Substrate-enhanced electroless deposition Graphene Ni foam Metal nanoparticles a-Fetoprotein antigen

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Coupling a titanium dioxide based heterostructure photoanode with electroless-deposited nickel-phosphorus alloy coating on magnesium alloy for enhanced corrosion protection

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Journal of Materials Science & Technology 2022年第31期126卷 252-265页

作者： Yue Liu Feng Peng Guang-Ling Yang Zhi-Hui Xie Wenxin Dai Yuejun Ouyang Liang Wu Chuan-Jian Zhong Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Medical Research Center Department of OrthopedicsGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Department of Chemistry State University of New York at BinghamtonBinghamtonNY13902United States

The utilization of photoelectrochemical cathodic protection(PECCP)enables an indirect corrosion pro-tection of metals with low self-corrosion potential by introducing a metallic nickel ***,the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the ***,this ability is demonstrated by coupling a covalent organic framework(TpBD)dec-orated TiO 2 photoanode(TiO 2/TpBD)with nickel coating on magnesium alloy for an effective corrosion *** composite photoanode showed direct PECCP for the nickel interlayer and indirect corro-sion protection of the magnesium *** composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The en-hanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves,photoinduced potential variations,and electrochemical impedance spectroscopy(EIS).Lastly,a corrosion protection mechanism is proposed,where the enhanced PECCP efficiency is at-tributed to the formation of a direct Z-scheme heterojunction,which is substantiated by the results from valence band(VB)XPS and electron spin resonance characterizations.

关键词： Magnesium alloy Corrosion Nickel coating electroless Photoelectrochemical cathodic protection

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High corrosion and wear resistant electroless Ni–P gradient coatings on aviation aluminum alloy parts

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 155-164页

作者： Bo Wang Jiawei Li Zhihui Xie Gengjie Wang Gang Yu College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410012China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province/College of Chemistry and Chemical Engineering China West Normal UniversityNanchong 637002China Zhongchuan Machinery Ltd.Co. Aero Engine Corporation of ChinaChangsha 410200China

A Ni–P alloy gradient coating consisting of multiple electroless Ni–P layers with various phosphorus contents was prepared on the aviation aluminum alloy. Several characterization and electrochemical techniques were used to characterize the different Ni–P coatings’ morphologies, phase structures, elemental compositions, and corrosion protection. The gradient coating showed good adhesion and high corrosion and wear resistance, enabling the application of aluminum alloy in harsh environments. The results showed that the double zinc immersion was vital in obtaining excellent adhesion (81.2 N). The optimal coating was not peeled and shredded even after bending tests with angles higher than 90°and was not corroded visually after 500 h of neutral salt spray test at 35℃. The high corrosion resistance was attributed to the misaligning of these micro defects in the three different nickel alloy layers and the amorphous structure of the high P content in the outer layer. These findings guide the exploration of functional gradient coatings that meet the high application requirement of aluminum alloy parts in complicated and harsh aviation environments.

关键词： aluminum alloy electroless nickel coating corrosion adhesion

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Novel technology of electroless Ni-W-P on plastics and its interface behavior

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中国有色金属学会会刊：英文版 2004年第z1期14卷 136-139页

作者： WANG Tian-xu HU Yong-jun MENG Ji-long College of Mechanical Engineering South China University of TechnologyGuangzhou 510641 China College of Mechanical Engineering South China University of TechnologyGuangzhou 510641 China College of Mechanical Engineering South China University of TechnologyGuangzhou 510641 China

The electroless Ni-W-P coatings on polyoxymethylene(POM) were prepared. The POM was pretreated by hot spraying Al powder on it. Before the electroless Ni-W-P deposition, the POM with Al coating was flash plated in alkaline bath. The mechanism of Ni-W-P deposition was studied and the technology was optimized. The XRD analysis shows that the "as-deposited" Ni-W-P plating has mixed crystalline structure. The hardness value of deposits is more than HV700. The abrasion resistance of deposits is six times more than that of POM. Bending test was used to determine the cohesion between the deposits and the substrates. SEM was used to study the behavior of surface abrasion and interface bonding condition. The reason for the excellent cohesion was interpreted.

关键词： plastics electroless plating interface Ni alloy

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electroless PLATING COMPOSITE COATINGS OF Ni-Ti-Re ON THE SURFACE OF DIAMOND

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Journal of Central South University 1999年第1期11卷 14-16页

作者： Guorong Hu Yexiang Liu Jianhong Yang Kaihua Yang Fenglin Tang Jihong Jin 1. Department of Nonferrous Metallurgy Central South University of Technology 410083 Changsha China 2. Institute of Technology China University of Geosciences 430074 Wuhan China

The coating of Ni W P was deposited as base layer, and then the composite coating of Ni Ti(particles) Re(rare earth) was deposited subsequently on the surface of diamond using electroless plating by adding 2～3 μm Ti particles and trace rare earth salt to bath solution. Ti particles deposited on the surface of diamond were found by SEM and formation of TiC was verified by X ray diffraction analysis after heat treatment of the coatings in vacuum at 900 ℃. The binding strength between the coated diamond and the metal matrix was improved effectively in the diamond composite based on metal cement.

关键词： diamond electroless plating composite coatings Ti particles rare earth

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