Electrochemical behavior of Zn–graphene composite coatings

This work illustrates the role of graphene in enhancing the corrosion resistant properties of chromium–graphene composite coating when compared to the corrosion resistant properties of pure chromium coating containing ZnO nanoparticles.

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Microstructure, morphology and electrochemical properties of ZnFe-Graphene composite coatings

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.12.354 ◽

2019 ◽

Vol 783 ◽

pp. 820-827 ◽

Cited By ~ 13

Author(s):

M.K. Punith Kumar ◽

M.Y. Rekha ◽

Juhi Agrawal ◽

Tushar Mani Agarwal ◽

Chandan Srivastava

Keyword(s):

Electrochemical Properties ◽

Composite Coatings ◽

Graphene Composite ◽

Microstructure Morphology

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Influence of Thermal Treatment on the Electrochemical Properties of Ni+Mo Composite Coatings in an Alkaline Solution

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.228.231 ◽

2015 ◽

Vol 228 ◽

pp. 231-236 ◽

Cited By ~ 1

Author(s):

Magdalena Popczyk ◽

B. Łosiewicz ◽

Eugeniusz Łągiewka ◽

A. Budniok

Keyword(s):

Thermal Treatment ◽

Electrochemical Properties ◽

Composite Coatings ◽

Electrochemical Corrosion ◽

X Ray Diffraction ◽

Corrosion Resistant ◽

X Ray ◽

Electrochemical Corrosion Resistance ◽

Galvanostatic Conditions ◽

Xrd Method

The Ni+Mo composite coatings were prepared by electrodeposition under the galvanostatic conditions (jdep= -300 mA cm-2) from the nickel bath containing molybdenum powders of different granulation (3-7 μm, <150 μm, <100 nm). Thermal treatment of the obtained coatings was conducted in the argon atmosphere. The surface morphology of the coatings was studied using a scanning electron microscopy (SEM). Chemical composition of the electrodeposits was determined by X-ray fluorescence spectroscopy (XRF). Phase composition investigations were conducted by X-ray diffraction (XRD) method. Investigations of hydrogen evolution reaction (HER) and electrochemical corrosion resistance were carried out in 5 M KOH solution. It was found that for the Ni+Mo thermally treated coatings the decrease in activity towards the HER was observed. Simultaneously these coatings are more corrosion resistant than Ni+Mo as-deposited coatings. The reasons for the electrochemical properties of these coatings have been discussed.

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Electroless Ni-P/Diamond/Graphene Composite Coatings and Characterization of their Wear and Corrosion Resistance in Sodium Chloride Solution

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.656-657.51 ◽

2015 ◽

Vol 656-657 ◽

pp. 51-56 ◽

Cited By ~ 4

Author(s):

Cheng Kuo Lee ◽

Chi Lun Teng ◽

An Hung Tan ◽

Ching Yi Yang ◽

Sheng Long Lee

Keyword(s):

Wear Resistance ◽

Aluminum Alloy ◽

Composite Coating ◽

Composite Coatings ◽

Surface Hardness ◽

Corrosion And Wear ◽

Nacl Solution ◽

Graphene Composite ◽

Plating Solution ◽

Electroless Ni

The purpose of the present study is to evaluate the effect of the electroless Ni-P/diamond/graphene composite coating on the structure and surface hardness of 2024-T6 aluminum alloy as well as their effect on the corrosion and wear resistance of the alloy in 3.5 % NaCl solution. The electroless Ni-P plating solution was prepared by adding different size diamond (6-12 μm and 0.2 μm) and nanographene into the electroless Ni-P plating solution to obtain Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings for comparison. Experimental results indicated that the Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings can be successfully electroless deposited on anodized 2024-T6 aluminum alloy. The anodically oxidized films, that formed on the aluminum alloy using phosphoric acid as the electrolyte, was porous with high density of pores, and thus could enhance the adhesion of the composite coatings. The Ni-P/daimond/graphene hybrid coating had a higher hardness as well as better corrosion and wear resistance of 2024-T6 alloy in 3.5 wt.% NaCl solution as compared with other composite coatings. When the combination of nanographene and smaller diamond particles added this beneficial effect was significantly raised, especially the composite coating was further vacuum annealed at 400 °C for 24 h to obtain a more smooth and defect-free coating structure.

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Microstructure and properties of rare earth CeO2-doped graphene composite coatings prepared by MAO on AA7050

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.3139/146.111871 ◽

2020 ◽

Vol 111 (11) ◽

pp. 923-930

Author(s):

Yu Zong ◽

Renguo Song ◽

Tianshun Hua ◽

Siwei Cai

Keyword(s):

Rare Earth ◽

Composite Coatings ◽

Microstructure And Properties ◽

Graphene Composite ◽

Doped Graphene

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Influence of Pulse Current Forward-Reverse Duty Cycle on Structure and Performance of Electroplated W–Cu Composite Coatings

Materials ◽

10.3390/ma14051233 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1233

Author(s):

Yuchao Zhao ◽

Nan Ye ◽

Haiou Zhuo ◽

Chaolong Wei ◽

Weiwei Zhou ◽

...

Keyword(s):

Composite Coating ◽

Duty Cycle ◽

Electrode Materials ◽

Pulse Current ◽

Electrical Discharge Machining ◽

Composite Coatings ◽

Electrical Contact ◽

Pulse Plating ◽

Fusion Welding ◽

Raw Material

Tungsten-copper (W–Cu) composites are widely used as electrical contact materials, resistance welding, electrical discharge machining (EDM), and plasma electrode materials due to their excellent arc erosion resistance, fusion welding resistance, high strength, and superior hardness. However, the traditional preparation methods pay little attention to the compactness and microstructural uniformity of W–Cu composites. Herein, W–Cu composite coatings are prepared by pulse electroplating using nano-W powder as raw material and the influence of forward-reverse duty cycle of pulse current on the structure and mechanical properties is systematically investigated. Moreover, the densification mechanism of the W–Cu composite coating is analyzed from the viewpoints of forward-pulse plating and reverse-pulse plating. At the current density (J) of 2 A/dm2, frequency (f) of 1500 Hz, forward duty cycle (df) of 40% and reverse duty cycle (dr) of 10%, the W–Cu composite coating rendered a uniform microstructure and compact structure, resulting in a hardness of 127 HV and electrical conductivity of 53.7 MS/m.

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Preparation and Degradation Characteristics of MAO/APS Composite Bio-Coating in Simulated Body Fluid

Coatings ◽

10.3390/coatings11060667 ◽

2021 ◽

Vol 11 (6) ◽

pp. 667

Author(s):

Zexin Wang ◽

Fei Ye ◽

Liangyu Chen ◽

Weigang Lv ◽

Zhengyi Zhang ◽

...

Keyword(s):

Simulated Body Fluid ◽

Composite Coating ◽

Body Fluid ◽

Composite Coatings ◽

Degradation Process ◽

Ceramic Coatings ◽

Immersion Test ◽

Substrate Material ◽

Atmospheric Plasma

In this work, ZK60 magnesium alloy was employed as a substrate material to produce ceramic coatings, containing Ca and P, by micro-arc oxidation (MAO). Atmospheric plasma spraying (APS) was used to prepare the hydroxyapatite layer (HA) on the MAO coating to obtain a composite coating for better biological activity. The coatings were examined by various means including an X-ray diffractometer, a scanning electron microscope and an energy spectrometer. Meanwhile, an electrochemical examination, immersion test and tensile test were used to evaluate the in vitro performance of the composite coatings. The results showed that the composite coating has a better corrosion resistance. In addition, this work proposed a degradation model of the composite coating in the simulated body fluid immersion test. This model explains the degradation process of the MAO/APS coating in SBF.

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