Composite Coatings of Chromium and Nanodiamond Particles on Steel

Gidikova, N.; Sułowski, M.; Petkov, V.; Valov, R.; Cempura, Grzegorz

doi:10.1515/amm-2017-0356

Cited by 6 publications

(5 citation statements)

References 11 publications

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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: 68%

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: 68%

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

Petkov

Valov

2019

SN Appl. Sci.

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“…New chemical treatment in acid -alkaline solution was applied on the surface of the samples 7* and 8* in order to improve the de-oxidation process. Our previous research [4] shows that the presence of diamond nanoparticles (NDDS) in the electrolyte increase the metal deposition. Samples 8 and 8* were prepared from electrolyte containing 10 g/l NDDS.…”

Section: Fig 1 Rectangular and Cylindrical Samples Uncoated And Coate...mentioning

confidence: 99%

“…The use of electroplated silver on electronic components is well established and continues to expand into new applications such as on waveguides for cellular telecommunications systems [3]. Depending on the application the thickness of the layer may vary from 2 to 24 µm [4]. Also a technology of depositing silver on aluminum using cyanide baths is proposed [5].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Valov,

Petkov,

Valkano

2019

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Silver coatings have a very high reflection ability. To avoid their darkening from the hydrogen sulphide in the air, a thin layer of heatresistant colorless lacquer is applied to the coatings. Silver plating is mainly used in jewelery, optics, electronics and electrical engineering. Depending on their application the thickness of the layer may vary from 2 to 24 µm. It can be done in several ways: chemical, electrochemical, contact, etc. The most common way of silver plating is the electrochemical deposition using cyanide and non-cyanide electrolytes. The cyanide electrolytes produce light, fine crystalline, dense and plastic coatings upon silver-plating. Usually silver coatings are applied with copper or nickel intermediate layer. In order to improve the de-oxidation of the aluminum surface new chemical treatment in acid -alkaline solution was applied. Our previous research shows that the presence of diamond nanoparticles in the electrolyte increase the metal deposition. Samples were prepared from electrolyte containing 10 g/l diamond nanoparticles. Their properties were compared to the properties of reference samples. The diamonds were obtained by detonation synthesis. The aim of this study is to obtain electrochemically deposited silver layer with high density, adhesion and electric conductivity on aluminum alloys substrate. The coating was directly plated without intermediate layer. Non-cyanide electrolyte composition and electrochemical parameters were determined in order to produce Ag coatings on Al alloy substrate without intermediate layer. The coating is with good adhesion, density and thickness of 14-23 μm.

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“…Therefore, many efforts have been done to increase corrosion resistance and stability of steel materials [3,4]. There are different corrosion protection methods including cathodic/anodic protection, coatings, inhibitors and proper design [5][6][7][8]. Surface treatment is a generic way to protect metals from corrosion, which includes physical vapor deposition, chemical conversion coating, electroless and electroplating and so on [9,10].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Majdi¹,

Danaee²,

Zaarei³

et al. 2020

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Silicate coatings have been considered as an alternative to toxic and carcinogenic other chemical treatments. In this paper, a strengthened silicate coating was formed on the surface of low carbon steel by dip immersion method. The modification and strengthening was done by loading colloidal nano-SiO 2 into the film. The characterizations of nano-SiO 2 were investigated by FESEM, TEM and FT-IR. The effects of nano contents (weight ratio) and drying temperatures on corrosion properties of silicate film were studied. Potentiodynamic polarization, electrochemical impedance spectroscopy and immersion tests have been used to study corrosion behavior of nano-loaded silicate films. Surface morphology, microstructure and its chemical composition were analyzed by means of FESEM, EDS, AFM, XRD, GIXRD, ATR-FTIR and Raman techniques. Results indicated that colloidal nano-SiO 2 properly modified the silicate coatings and significantly improved the corrosion resistance and barrier property. Also drying temperature showed a considerable effect in silicate coating and higher corrosion resistance was obtained with 150°C curing.

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Composite Coatings of Chromium and Nanodiamond Particles on Steel

Cited by 6 publications

References 11 publications

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

Archives of Foundry Engineering

Archives of Metallurgy and Materials

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