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

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

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

Chemija ◽

10.6001/chemija.v29i2.3712 ◽

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.

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

Coatings ◽

10.3390/coatings11040473 ◽

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.

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Preparation and Characterization of Zn-Containing Hydroxyapatite/TiO2 Composite Coatings on Ti Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.685.367 ◽

2011 ◽

Vol 685 ◽

pp. 367-370 ◽

Cited By ~ 3

Author(s):

Min Qi ◽

Da Yi Yang ◽

Jing Ying Zhang ◽

Hong Jun Ai

Keyword(s):

Adhesion Strength ◽

Composite Coatings ◽

Energy Dispersive Spectrometer ◽

Sol Gel ◽

X Ray Diffraction ◽

Zn Content ◽

Micro Arc Oxidation ◽

Gel Technique ◽

Bacteria Resistance

In order to improve the osteoblast growth and bacteria resistance, Zn-containing hydroxyapatite (Zn-HA) and titanium oxide (TiO2) composite coatings were prepared to improve binding between coating and Ti substrate. TiO2 film was prepared on the surface of Ti by micro-arc oxidation (MAO) and Zn-HA coating was deposited on TiO2 using sol–gel technique. Phase structure, composition and microstructure of the surface coatings were analyzed by X-ray diffraction (XRD) and Energy Dispersive Spectrometer (EDS), respectively. The adhesion strength between the coatings with different Zn content was measured by tensile testing. The results showed that there was no significant influence of Zn content on adhesion strength between coating and Ti substrate.

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