Mechanical properties of composite coatings of chromium and nanodiamonds on aluminum

Gidikova, N.; Sułowski, M.; Madej, M.; Valov, R.; Petkov, V.

doi:10.1051/matecconf/201814505012

Cited by 2 publications

(2 citation statements)

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“…The electrochemical chromium coatings, modified with diamond nanoparticles, deposited on wrought steel, sintered steel and other metals and alloys increase several times their hardness, wear and corrosion resistance in comparison to the monochromium coatings. Our studies unambiguously showed the influence of the diamond nanoparticles in improvement of the chemical and mechanical properties of the composite Cr + ND coatings [1][2][3]. The role of the diamond nanoparticles in the built-up of the coatings and their presence in the layer are controversial.…”

Section: Introductionmentioning

confidence: 65%

Structure and morphology of composite coating of chromium with diamond nanoparticles on sintered steels

Petkov

Valov

2019

SN Appl. Sci.

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Electrochemical chromium coatings modified with diamond nanoparticles (ND) were deposited on sintered steel materials obtained from iron powder and ultrafine graphite powder. The diamond nanoparticles were produced by detonation synthesis. Their average size is 6 nm. The sintered steel consisted of 0.2, 0.4, 0.6 and 0.8%C (added in the form of graphite) by weight. The produced composite coatings consisting of Cr + ND were compact, tightly adhering to the substrate, with thickness of about 25-35 μm. The surface morphology and microstructure of the coatings were investigated by SEM and EDS analyzes. The main objective of the study was to explore the presence of ND in the coating by the X-ray photoelectron spectroscopy and the impact of the ND concentration in the electrolyte on the presence of the diamond nanoparticles in the coating. The spectra of the C1s photoelectronic line were obtained, the sp 3 /sp 2 ratio and the sp 3 + sp 2 sum were determined electronically on the surface of the coatings (depth 10 nm). The Cr2p photoelectronic line spectra were also obtained. The coatings were deposited from electrolytes with ND concentrations of 10, 25 and 40 g/l. A diamond-like phase has been found in coatings obtained at concentrations of diamond nanoparticles in the electrolyte of 25 and 40 g/l. The sp 3 /sp 2 ratio with a value equal to or greater than 1.2 is an indication of the presence of a diamond-like phase in the coatings and the ratio depends on the concentration of ND in the electrolyte.

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Section: Introductionmentioning

confidence: 65%

Structure and morphology of composite coating of chromium with diamond nanoparticles on sintered steels

Petkov

Valov

2019

SN Appl. Sci.

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“…The deposition of nickel coatings with TiO 2 nanoparticles on aluminum alloys increases their hardness and corrosion resistance [12]. Modified with diamond nanoparticles chromium coating applied on aluminum alloys enhances the mechanical and chemical properties of their surface [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effects of Diamond Nanoparticles on the Microstructure, Hardness and Corrosion Resistance of Chromium Coatings

Petkov¹,

Valov²

2020

AJCHE

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Electrodeposited coatings of chromium and diamond nanoparticles on steel were obtained. The chromium is plated directly on the steel matrix without any intermediate layers. The influence of the electrodeposition current density, the electrodeposition time and the concentration of diamond nanoparticles in the chromium-plating electrolyte on the microstructure, the phase composition, the microhardness and the corrosion resistance of the chromium coatings were investigated. The phase and chemical compositions of the composite coating (chromium and diamond nanoparticles) were examined using X-ray Diffraction (XRD) and Scanning Electron Microscopy -Energy-Dispersive X-ray Spectroscopy (SEM-EDS) techniques. The microstructure and microhardness were examined with a metallographic microscope and a microhardness tester. The corrosion resistance was investigated in 3.5 wt % NaCl solution using the gravimetric method. The bond between the chromium coating and the steel matrix has diffusion character. A sublayer of separate irregular shape formations appears at concentration of diamond nanoparticles 25 g/l and more. The formation of these structures depends only on the concentration of diamond nanoparticles and is not influenced by the other electrodeposition parameters. With the increase of the concentration of diamond nanoparticles in the electrolyte the rate of chromium coating deposition increases and respectively the thickness of the coating increases also. This increase is more than twice the thickness of chromium coating without nanodiamonds. The microhardness of the composite coatings rises also compared to unmodified chromium coating. With the increase of the concentration of the diamond nanoparticles 2 times greater microhardness is achieved and up to 5 times greater corrosion resistance compared to monochromium coating. The values of the other electroplating parameters are constant.

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Mechanical properties of composite coatings of chromium and nanodiamonds on aluminum

Cited by 2 publications

References 1 publication

Structure and morphology of composite coating of chromium with diamond nanoparticles on sintered steels

Structure and morphology of composite coating of chromium with diamond nanoparticles on sintered steels

Effects of Diamond Nanoparticles on the Microstructure, Hardness and Corrosion Resistance of Chromium Coatings

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