Microstructure and Performance of Nano-Al2O3/Ni-Co Composite Coatings by Electro-Brush Plating

2012 ◽  
Vol 482-484 ◽  
pp. 2371-2375
Author(s):  
Xiao He Wang ◽  
Bin Shi Xu ◽  
Zhen Feng Hu ◽  
Shi Yun Dong
Keyword(s):  
Surface Morphology ◽  
Composite Coating ◽  
Composite Coatings ◽  
Wear Test ◽  
Nano Particles ◽  
Wear Properties ◽  
Properties Of Coatings ◽  
Nano Composite ◽  
Nano Composite Coating ◽  
Brush Plating

To remanufacture hard chromium-plated workpiece, nano-Al2O3/Ni-Co composite coatings and Ni-Co alloy coatings are developed using electric brush plating technology. Scanning electron microscopy (SEM) and transmission electron microscope (TEM) are used to analyze the surface morphology, phase structure and wear properties of coatings. The surface morphology of nano-composite coating is more compact. The nano-particles are well-distributed in the coating and bounded tightly with the substrate. The hardness of composite coating is HV1027, increased approximately 38% compared with Ni-Co alloy coating, overtaking the hard chrome plating. The results of sliding wear test shows that the nano-composite coating reduces friction coefficient, increases wear resistance significantly and exceeds the chromium plating.

Experimental investigation of electrodeposited Ni-Al2O3/ZrO2 nano composite on HSLA ASTM A860 alloy

2021 ◽  
Author(s):  
Chandrasekhara Sastry Chebiyyam ◽  
Pradeep N ◽  
Shaik AM ◽  
Hafeezur Rahman A ◽  
Sandeep Patil
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Composite Coating ◽  
Base Alloy ◽  
Composite Coatings ◽  
Nano Particles ◽  
Alloy Sample ◽  
Nano Composite ◽  
Nano Coating ◽  
Nano Composite Coating

Abstract Nano composite coatings on HSLA ASTM A860 alloy, adds to the barrier efficacy by increase in the microhardness, wear and corrosion resistance of the substrate material. Additionally, reduction of delamination of the nano composite coating sample is ascertained. Ball milling is availed to curtail the coating samples (Al2O3/ZrO2) to nano size, for forming a electrodeposited product on the substrate layer. The curtailment in grain size was ascertained to be 17.62% in Ni-Al2O3/ZrO2 nano composite coating. During the deposition process, due to the presence of Al2O3/ZrO2 nano particles an increase in cathode efficiency is ascertained. An XRD analysis of the nano composite coating indicates a curtailment in grain size along with increase in the nucleation sites causing a surge in the growth of nano coating layer. In correlation to uncoated HSLA ASTM A36 alloy sample, a surge in compressive residual stress by 47.14%, reduction of waviness by 32.14% (AFM analysis), upsurge in microhardness by 67.77% is ascertained in Ni-Al2O3/ZrO2 nano composite coating. Furthermore, in nano coated Ni-Al2O3/ZrO2 composite a reduction is observed pertaining to weight loss and friction coefficients by 27.44% and 13% in correlation to plain uncoated alloy respectively. A morphology analysis after nano coating indicates, Ni-Al2O3/ZrO2 particles occupy the areas of micro holes, reducing the wide gaps and crevice points inside the matrix of the substrate, enacting as a physical barrier to upsurge the corrosion resistance by 67.72% in correlation to HSLA ASTM A860 base alloy.

Forming Mechanism of Composite Coating with Nano-Particles and its Wear Resistance

2013 ◽  
Vol 281 ◽  
pp. 500-504 ◽  
Author(s):  
Xue Song Li ◽  
Long Sheng He ◽  
You Yang
Keyword(s):  
Composite Coating ◽  
Composite Coatings ◽  
Pure Copper ◽  
Copper Substrate ◽  
Nano Particles ◽  
Nano Composite ◽  
Forming Mechanism ◽  
Nickel Coatings ◽  
Electrodeposited Nickel ◽  
Nanometer Particles

Ni-SiC nano composite coatings were prepared on pure copper substrate. The surface morphology and distribution of nanometer particles of the composite coatings were observed by scanning electron microscope (SEM), micro-hardness of coatings was tested by HXD-1000 microharder. The results showed that microstructure of Ni-SiC nano composite coating is different from that of electrodeposited nickel coatings. Its electrodepositing process abided by the principal of adsorption. By adding nanometer particles, the structure of composite coatings can be effectively fined, microhardness of composite coatings is improved apparently by comparing with that of electrodeposited nickel coatings. Abrasion resistance of Ni-SiC nano composite coatings is excellent.

scholarly journals Enhanced Wear Performance of Cu-Carbon Nanotubes Composite Coatings Prepared by Jet Electrodeposition

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 392 ◽  
Author(s):  
Dongdong Ning ◽  
Ao Zhang ◽  
Hui Wu
Keyword(s):  
Carbon Nanotubes ◽  
Surface Morphology ◽  
Composite Coating ◽  
Composite Coatings ◽  
Sodium Dodecyl ◽  
Wear Test ◽  
Uniform Electric Field ◽  
Wear Performance ◽  
Jet Electrodeposition ◽  
Pure Cu

Cu-carbon nanotubes (CNTs) composite coatings with high CNT content and uniformly distributed CNTs were successfully prepared via jet electrodeposition. Pristine CNTs, without any treatment like acid functionalization, were used. Anionic surfactant sodium dodecyl sulfate (SDS) was used to increase the wettability of the CNTs and improve the content of incorporated CNTs. With an appropriate SDS concentration (300 mg/L) in the electrolyte, the incorporated CNT content is as high as 2.84 wt %, much higher than the values reported using conventional electrodeposition (0.42–1.05 wt %). The high-content CNTs were uniformly distributed in the composite coating. The surface morphology of this composite coating (2.84 wt % CNTs) was flat due to the uniform electric field in jet electrodeposition. In the wear test a with load of 1 N and sliding speed of 0.02 m/s, the wear rate of this composite coating was 1.3 × 10−2 mg/Nm, 85.4% lower than that of pure Cu. The enhanced wear performance of Cu-CNTs composite coatings can be attributed to high CNT content and flat surface morphology.

Effects of Current Density on the Microstructure and Properties of Electrodeposited Black Cr-C Nano-Composite Coatings on Steel Substrate

2011 ◽  
Vol 687 ◽  
pp. 641-646 ◽  
Author(s):  
Xue Song Li ◽  
Yue Yang ◽  
You Yang ◽  
Hua Wu
Keyword(s):  
Composite Coating ◽  
Current Density ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Particle Content ◽  
Nano Composite ◽  
X Ray ◽  
Nano Composite Coating

Eelectrodeposited black Cr-C nano-composite coating was prepared on the steel substrate and the effects of current density on the properties of the composite coating were studied in the present paper. The surface morphology and phase composition of the composite coatings were analyzed by means of scanning electronic microscopy (SEM) and X-ray diffractometer (XRD). Microhardness was determined by micrometer and the wear resistance of the coatings was evaluated by CETR using a universal materials tester (UMT). The results showed that formed under the condition of current density of 100A/dm2, temperature of 15°C, and the optimum particle content in electrolyte was 10g/l. The maximum microhardness of black Cr-C nano-composite coating was 10.8 Gpa, simutaneously, the wearing resistance of the coating improved significantly compared to the steel substrate.

scholarly journals Effect of Laser Cladding Stellite 6-Cr3C2-WS2 Self-Lubricating Composite Coating on Wear Resistance and Microstructure of H13

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 785 ◽  
Author(s):  
Wei Chen ◽  
Bo Liu ◽  
Long Chen ◽  
Jiangping Xu ◽  
Yingxia Zhu
Keyword(s):  
Composite Coating ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Wear Test ◽  
Hot Working ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Stellite 6 ◽  
Hot Working Die Steel ◽  
Eutectic Colony

In order to prevent the wear failure of the hot-working die, the composite coatings of Stellite 6-Cr3C2-WS2 was fabricated on H13 hot-working die steel by laser cladding. The composite coating was prepared through the in-situ generation technology, that can give H13 the ability of self-lubricating at the working temperature (about 200 °C). The effect of the various WS2 percentages on the properties of the coating was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness test, friction and wear test. In addition, the phase constitutions, microstructures and wear properties were also investigated systematically. The obtained hardness of the cladding coating is approximately 2.5 times higher than the substrate because of the constituents of γ-(Fe, Co)/Cr7C3 eutectic colony, (Cr, W)C carbide and dendritic crystals in the coating. Furthermore, the friction coefficient decreases to 70% of the substrate due to the CrS self-lubricating phase. The analyses results suggest that an 85% Stellite 6-10% Cr3C2-5% WS2 composite coating has excellent material properties.

Preparation and Study of Novel Nano-Composite Coatings on the Surface of Plastic Moulds

2011 ◽  
Vol 311-313 ◽  
pp. 344-347
Author(s):  
Qian Wang
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Metal Corrosion ◽  
Coating Materials ◽  
Nano Composite ◽  
Optimal Amount ◽  
Wear And Corrosion ◽  
Nano Composite Coating ◽  
Wear And Corrosion Resistance

Compared with ordinary coatings, nano-composite coating usually has a higher hardness and better wear and corrosion resistance. As coating materials, the nano-CeO2/Zn composites were prepared by nano-CeO2 and Zn powder. The microstructure was investigated by XRD and FESEM. The corrosion resistance and hardness of nano-CeO2/Zn composites with different amount of nano-CeO2 were comparatively studied. The results show that the metal corrosion resistance, hardness and density of the composites may be improved significantly by addition of nano-CeO2, and the optimal amount of nano-CeO2 is 1%.

Microstructural, nanomechanical and wear properties of magnetic pulse electrodeposited Ni-TiN composite coatings

2016 ◽  
Vol 23 (5) ◽  
pp. 535-541 ◽  
Author(s):  
Fafeng Xia ◽  
Jiyu Tian ◽  
Chunyang Ma ◽  
Xiuying Xu ◽  
Ming Huang
Keyword(s):  
Electron Microscopy ◽  
Composite Coating ◽  
Composite Coatings ◽  
Wear Test ◽  
Average Diameter ◽  
Magnetic Pulse ◽  
Magnetic Intensity ◽  
Wear Properties ◽  
Average Value ◽  
Transmission Electron

AbstractThe current paper reports successful syntheses of Ni-TiN composite coatings via pulse current (PC) and magnetic PC (MPC) depositions. The microstructural, nanomechanical, wear properties and wear mechanism of the Ni-TiN composite coatings were investigated via scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM), X-ray diffraction (XRD), a nanoindenter (NI) and a high frequency reciprocating wear test instrument. The results showed that the Ni-TiN composite coating deposited at magnetic intensity of 0.3 T had numerous homogeneously dispersed TiN particles. The size of the Ni grains and the TiN particles in the coating were of nanometer size, with an average diameter of ∼65 nm and ∼25 nm, respectively. The maximum hardness and Young’s modulus values for the Ni-TiN composite coatings, deposited at magnetic intensity of 0.3 T, were 34.85 GPa and 165.2 GPa, respectively. The wear results showed that the weight loss of the Ni-TiN composite coating was approximately 47.4 mg at a magnetic density of 0.3 T. Furthermore, the coatings deposited at 0.3 T presented low friction coefficients, with an average value of about 0.43.

scholarly journals Fabrication of Wear Resistance Ni/SiC nano composite Coating by Electro co-deposition

2021 ◽  
Vol 2114 (1) ◽  
pp. 012077
Author(s):  
N Salam ◽  
M A. Jaleel
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Wear Behavior ◽  
Composite Coatings ◽  
Nano Composite ◽  
Sic Nanoparticles ◽  
Electro Deposition ◽  
Nano Composite Coating ◽  
Disk Test ◽  
Deposition Conditions

Abstract In this paper, we succeeded in obtaining a Ni/SiC nano composite coating using conventional electro deposition by adding different amount of SiC nanoparticles to a nickel-watt bath to be co-deposited. The effect of electro deposition conditions was studied by changing the amount of SiC nanoparticles in the nano composite, and the deposition current density which affects on the participation of SiC nanoparticles in the coating. The morphology and mechanical properties of the electrodeposited nano-composite were studied. The wear behavior of the nano-composite coatings was evaluated on a ball-on-disk test. It was found that the increased micro hardness and wear resistance of the nano-composite coatings increased with increasing content of the SiC nano-particulate in bath.

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