One-step electrodeposited Ni-graphene composite coating with excellent tribological properties

Li, Xiang; Shen, Qianqian; Zhang, Yu; Bai, Wei; Nie, Chaoyin

doi:10.1016/j.surfcoat.2019.05.074

Cited by 79 publications

(40 citation statements)

References 36 publications

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“…The XRD pattern of the natural graphite presents peaks located at 2θ ≈ 26° and 54° corresponding to the plane of (002), (004), respectively 60‐62 . The diffraction peaks observed at 2θ = 44.4°, 51.8°, 76.38° are attributed to (111), (200), (220) lattice plane, respectively, indicating face‐centered cubic (fcc) Ni crystal plane 63 . The diffraction peaks at 38.1°, 44.3°, 77.4°, and 83.4° can be, respectively, indexed to be (111), (200), (311), and (222) lattice planes indicating fcc Ag crystal plane 64,65 …”

Section: Resultsmentioning

confidence: 99%

“…[60][61][62] The diffraction peaks observed at 2θ = 44.4 , 51.8 , 76.38 are attributed to (111), (200), (220) lattice plane, respectively, indicating face-centered cubic (fcc) Ni crystal plane. 63 The diffraction peaks at 38.1 , 44.3 , 77.4 , and 83.4 can be, respectively, indexed to be (111), (200), (311), and (222) lattice planes indicating fcc Ag crystal plane. 64,65 The morphologies of the bare and modified graphite electrodes with Ni, Ag, and Ni/Ag are given in Figure 2.…”

Section: Experimental Analysismentioning

confidence: 99%

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Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode

et al. 2020

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Summary In this study, graphite (G) electrode was coated with nickel and decorated with silver nanoparticles (G/Ni/Ag) with the help of galvanostatic method, and electrodes were used as a cathode in alkaline water electrolysis system. The characterization was achieved using X‐ray diffraction and field emission scanning electron microscopy. Hydrogen evolution performance of electrodes was investigated via cyclic voltammetry, chronoamperometry, cathodic polarization curves, and electrochemical impedance measurements. Electrochemical results showed that hydrogen production efficiency significantly increased and charge transfer resistance decreased via G/Ni/Ag. The electrochemical water splitting performance of G/Ni/Ag, was established in a joint experimental and computational effort. Water and proton adsorption on Ag‐decorated Ni surface were investigated using density functional theory. Electronic structure calculations identified the role of Ag adatom and Ni surface on water and proton adsorptions. From the computational studies, O in water was more reliable to adsorb at the bridge position of the Ag and Ni atoms, leading improved orbital overlap between H and Ni atoms and maximized chemical and physical interactions between the H2O molecules. Therefore, the Ag‐decorated Ni(111) surface provides preferable adsorption site for the O atom in water and direct interactions between water Hs and available surface Ni atoms promote water dissociation.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Analysismentioning

confidence: 99%

Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode

et al. 2020

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“…At the same time, this behavior will lead to the increase of friction coefficient, which will lead to the increase of friction coefficient. Of course, the average friction coefficient of LC1 is slightly higher than that of LC2 and LC3, although the friction coefficient generally decreases with the increase of hardness [39].…”

Section: Microhardness and Wear Behaviormentioning

confidence: 86%

Microstructure and Wear Resistance of Multi-Layer NI-Based Alloy Cladding Coating on 316l SS Under Different Laser Power

Su¹,

Zhang²,

Dai³

et al. 2020

Preprint

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Three kinds of Ni based alloy cladding coatings were prepared on 316L stainless steel at different power. The microstructure of the cladding layer was observed and analyzed by XRD, metallographic microscope and SEM. The hardness of the cladding layer was measured, and the wear resistance of the cladding layer was tested by friction instrument. The results show that the effect of laser cladding is good and the cladding layer has a good metallurgical bonding with the substrate. Different microstructures such as dendritic and equiaxed grains can be observed in the cladding layer. With the increase of laser power, more equiaxed and columnar dendrites can be observed. The phase composition of the cladding layer is mainly composed of γ - Ni solid solution and some intermetallic compounds such as Ni3B, Cr5B3 and Ni17Si3. The results of EDS show that there are some differences in the distribution of C and Si between dendrites. The hardness of the cladding layer is about 600 HV0.2, which is about three times of the substrate (~ 200 HV0.2). Through the analysis of the wear morphology, the substrate wear is serious, there are serious shedding, mainly adhesive wear and abrasive wear. However, the wear of cladding layer is slight, which is abrasive wear, and there are some grooves on the surface.

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“…За последние пять лет наблюдается интерес исследователей к получению и исследованию свойств композиционных электрохимических покрытий на основе никелевой, цинковой, оловянной матриц с включением наночастиц графена [15][16][17][18][19][20][21][22][23]. Включение наночастиц приводит, как правило, к значительному изменению кристаллической структуры осадков и размеров зерен осаждаемого металла, улучшению коррозионной стойкости композиционных покрытий, снижению коэффициентов трения и износа, приданию эффекта сухой смазки [19].…”

Section: Abstract: Graphene Composite Coatingsunclassified

Production and Properties of Composite Electrochemical Coatings With Electrochemically Dispersed Graphene Based on Nickel Matrix

Bratkov¹,

Yudina²,

Мельников³

et al. 2020

IVKKT

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In this work, the effect of addition of colloidal solutions of electrochemical exfoliated graphene (EEG) to the Watts bath on the process of obtaining composite coatings based on a nickel matrix was studied. It was found that the introduction of nanoparticle additives has a significant effect on the value of cathodic overvoltage during electro reduction of Ni2+. The strongest inhibition of the cathode process takes place with the introduction of 0.2 g/l of additives investigated. Further increase in the concentration of nanoparticles in the bath reduces the effect. The inhibition of the cathodic reduction of Ni2+ is associated with the adsorption of graphene nanoparticles on the active faces of growing nickel crystallites and the blocking of the accessible surface for Ni2+ reduction. Due to the increase in cathodic polarization during the deposition of the composite coating, the crystallites of the deposited nickel decrease in size and the texture of the crystal structure of the coating changes. According to energy dispersive spectroscopy data, carbon has been included in the composite coating. The carbon content in the coating increases with increasing concentration of nanoparticles in the working electrolyte. The inclusion of negatively charged nanoparticles of electrochemically dispersed graphene in the resulting precipitate becomes possible due to adsorption of Ni2+ and recharging of graphene nanoparticles. It was found that the optimal concentration of electrochemically dispersed graphene in the working electrolyte is 0.1-0.2 g/l. At a given nanoparticle content in the working bath, the porosity and roughness of the coatings decreases. The Tafel polarization curves for composite coating samples obtained in a 0.5M NaCl solution showed that the inclusion of graphene nanoparticles in the resulting coating leads to a shift of the corrosion potential to the negative area. With an increase in the carbon content in the coating, the shift in corrosion potentials increases, and the value of corrosion currents increases. For samples of composite coatings obtained at an EEG additive concentration of 0.1 g/l, a slight improvement in the protective properties is noted, which is associated with a decrease in the porosity of the coatings.

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One-step electrodeposited Ni-graphene composite coating with excellent tribological properties

Cited by 79 publications

References 36 publications

Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode

Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode

Microstructure and Wear Resistance of Multi-Layer NI-Based Alloy Cladding Coating on 316l SS Under Different Laser Power

Production and Properties of Composite Electrochemical Coatings With Electrochemically Dispersed Graphene Based on Nickel Matrix

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