Electrodeposition and Characterization of Cr-Fe-ZrO2 Composite Coating from Trivalent Chromium Chloride Electrolyte

2011 ◽  
Vol 239-242 ◽  
pp. 3056-3061 ◽  
Author(s):  
Xiang Zhu He ◽  
Xin Li Zhou ◽  
Lin Yuan Huang
Keyword(s):  
Composite Coating ◽  
Composite Coatings ◽  
Trivalent Chromium ◽  
Complexing Agent ◽  
Bending Tests ◽  
Chromium Chloride ◽  
Chloride Electrolyte ◽  
Appearance Quality ◽  
Nano Size

Cr-Fe-ZrO2composite coatings were electrodeposited in trivalent chromium chloride electrolyte containing glycine as complexing agent. The effects of electrodeposition parameters such as current density and electroplating time on appearance, surface morphology and composition of the Cr-Fe-ZrO2composite coatings were investigated mainly. The obtained Cr-Fe-ZrO2composite coatings were characterized by means of scanning electron microscope (SEM) and energy disperse spectroscopy (EDS) techniques; the appearance quality was evaluated by range estimation; and the bonding force was analyzed by bending tests. The SEM results showed that the nano-size ZrO2powder were fairly distributed through out in the composite coating, and the composite coating contained only few fine cracks. The EDS results indicated that the composite coating contained chromium, iron, zirconium, oxygen, carbon and chlorine. The deposited coating was glossy and the results of bending tests showed that the bonding between the composite coating and the substrate was good

scholarly journals Characterization of Cr–ZrO2 composite coatings electrodeposited from Cr(III) bath

Chemija ◽  
2018 ◽  
Vol 29 (2) ◽  
Author(s):  
G. Bikulčius ◽  
A. Češūnienė ◽  
A. Selskienė ◽  
A. Grigucevičienė ◽  
V. Jasulaitienė ◽  
...  
Keyword(s):  
Cross Section ◽  
Metal Matrix ◽  
Corrosion Behaviour ◽  
Composite Coatings ◽  
Research Work ◽  
Trivalent Chromium ◽  
Complexing Agent ◽  
Protective Properties ◽  
Cr Coating

The aim of this work was to incorporate ZrO2 particles into a Cr matrix within the research work aimed at obtaining metal matrix composite coatings (Cr–ZrO2) under direct current and to evaluate their protective properties. A Cr–ZrO2 composite coating was deposited from an electrolyte based on trivalent chromium sulphate with formate-urea as a complexing agent containing various concentrations of ZrO2. Cross-section investigations have revealed that ZrO2 particles incorporated into the Cr coating are uniformly distributed. The results indicate that ZrO2 particles influence the microhardness, morphology and corrosion behaviour of Cr–ZrO2 composite coatings obtained from the Cr(III) bath.

Preparation and characterization of superhydrophobic composite coatings on a magnesium–lithium alloy

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90587-90596 ◽  
Author(s):  
Zhijun Li ◽  
Yi Yuan
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Alloy Surface ◽  
Water Repellent ◽  
Lithium Alloy

We report a superhydrophobic organophosphonate composite coating on a magnesium–lithium alloy surface, which exhibits excellent water-repellent and corrosion resistance properties.

Characterization of the Cr-C/Si 3 N 4 Composite Coatings Electroplated from a Trivalent Chromium Bath

2016 ◽  
Vol 209 ◽  
pp. 244-253 ◽  
Author(s):  
Chia-Wen Liao ◽  
Hung-Bin Lee ◽  
Kung-Hsu Hou ◽  
Shun-Yi Jian ◽  
Chen-En Lu ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Trivalent Chromium

scholarly journals Effect of Carbon Fiber Addition on the Microstructure and Wear Resistance of Laser Cladding Composite Coatings

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 684 ◽  
Author(s):  
Jianfeng Li ◽  
Zhencai Zhu ◽  
Yuxing Peng ◽  
Gang Shen
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Carbon Fibers ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Alloy Coating ◽  
X Ray ◽  
Nano Size ◽  
Original Coating

In this study, the effect of carbon fibers (CFs) on the microstructure and wear resistance of Fe-based alloy coating produced by laser cladding was investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometer (EDS), and wear tester. The results indicated that with the addition of CFs, the microstructure of the composite coating mainly transformed from α-Fe cellular dendrites and γ-Fe/(Cr, Fe)7C3/CrB eutectics to bulk-like (Cr, Fe)7C3, nano-size B4C, and γ-(Fe, Ni)/(Cr, Fe)23C6 lamellar eutectics. Additionally, the microhardness and wear resistance of the composite coating compared with the original coating both increased by approximately two times. The original coating showed the dominant wear mechanisms of micro-cutting and serious brittle spalling, while the composite coating with CFs showed the main wear mechanism of slight scratching.

scholarly journals Characterization of Nb2O5-Ni Coating Prepared by DC Sputtering

2021 ◽  
Vol 39 (4A) ◽  
pp. 565-572
Author(s):  
Hiyam M. Jedy ◽  
Rana A. Anaee ◽  
Abdullah A. Abdulkarim
Keyword(s):  
Surface Roughness ◽  
Structural Steel ◽  
Composite Coating ◽  
Composite Coatings ◽  
Microhardness Test ◽  
Dc Sputtering ◽  
Uncoated Surface ◽  
Afm Analysis ◽  
Coated Surface

The Nb2O5-Ni coating was processed using DC sputtering on structural steel and study characterization of composite coating SEM/EDS inspection indicated clearly perfect incorporation of Nb2O5 within the nickel rich. Increasing in surface roughness and decreasing in average diameters of particles were obtained for coated surface compared with uncoated surface from AFM analysis, in addition, microhardness test and thickness test showed that increasing of the hardness value to 163 HV for Nb2O5 - Ni composite coating compared to 132 HV for uncoated samples, the hardness for Ni coating also increasing to155 HV and the thickness for Nb2O5-Ni composite coatings increased significantly compared to uncoated samples.

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

Materials ◽  
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.

scholarly journals Fabrication and Characterization of Antimicrobial Magnetron Cosputtered TiO2/Ag/Cu Composite Coatings

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 473
Author(s):  
Dilyana Gospodonova ◽  
Iliana Ivanova ◽  
Todorka Vladkova
Keyword(s):  
Antimicrobial Activity ◽  
Composite Coatings ◽  
Surface Characteristics ◽  
Standard Test ◽  
Most Probable Number ◽  
Bacterial Strains ◽  
Probable Number ◽  
Fabrication And Characterization

The aim of this study was to prepare TiO2/Ag/Cu magnetron co-sputtered coatings with controlled characteristics and to correlate them with the antimicrobial activity of the coated glass samples. The elemental composition and distribution, surface morphology, wettability, surface energy and its component were estimated as the surface characteristics influencing the bioadhesion. Well expressed, specific, Ag/Cu concentration-dependent antimicrobial activity in vitro was demonstrated toward Gram-negative and Gram-positive standard test bacterial strains both by diffusion 21 assay and by Most Probable Number of surviving cells. Direct contact and eluted silver/coper nanoparticles killing were experimentally demonstrated as a mode of the antimicrobial action of the studied TiO2/Ag/Cu thin composite coatings. It is expected that they would ensure a broad spectrum bactericidal activity during the indwelling of the coated medical devices and for at least 12 h after that, with the supposition that the benefits will be over a longer time.

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

Coatings ◽  
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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