Effect of Zn content on cytoactivity and bacteriostasis of micro-arc oxidation coatings on pure titanium

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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SEM and EDS Characterization of Porous Coatings Obtained On Titaniumby Plasma Electrolytic Oxidation in Electrolyte Containing Concentrated Phosphoric Acid with Zinc Nitrate

Advances in Materials Science ◽

10.1515/adms-2017-0010 ◽

2017 ◽

Vol 17 (2) ◽

pp. 41-54 ◽

Cited By ~ 6

Author(s):

K. Rokosz ◽

T. Hryniewicz ◽

K. Pietrzak ◽

W. Malorny

Keyword(s):

Phosphoric Acid ◽

Plasma Electrolytic Oxidation ◽

Pure Titanium ◽

Zinc Nitrate ◽

Porous Coatings ◽

Electrolytic Oxidation ◽

Micro Arc Oxidation ◽

Plasma Electrolytic ◽

Peo Coatings

AbstractThe SEM and EDS results of porous coatings formed on pure titanium by Plasma Electrolytic Oxidation (Micro Arc Oxidation) under DC regime of voltage in the electrolytes containing of 500 g zinc nitrate Zn(NO3)2·6H2O in 1000 mL of concentrated phosphoric acid H3PO4at three voltages, i.e. 450 V, 550 V, 650 V for 3 minutes, are presented. The PEO coatings with pores, which have different shapes and the diameters, consist mainly of phosphorus, titanium and zinc. The maximum of zinc-to-phosphorus (Zn/P) ratio was found for treatment at 650 V and it equals 0.43 (wt%) | 0.20 (at%), while the minimum of that coefficient was recorded for the voltage of 450 V and equaling 0.26 (wt%) | 0.12 (at%). Performed studies have shown a possible way to form the porous coatings enriched with zinc by Plasma Electrolytic Oxidation in electrolyte containing concentrated phosphoric acid H3PO4with zinc nitrate Zn(NO3)2·6H2O.

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Electrochemical Surface Biofunctionalization of Titanium through Growth of TiO2 Nanotubes and Deposition of Zn Doped Hydroxyapatite

Coatings ◽

10.3390/coatings12010069 ◽

2022 ◽

Vol 12 (1) ◽

pp. 69

Author(s):

Diana Maria Vranceanu ◽

Elena Ungureanu ◽

Ionut Cornel Ionescu ◽

Anca Constantina Parau ◽

Adrian Emil Kiss ◽

...

Keyword(s):

Anatase Phase ◽

Pure Titanium ◽

Chemical Properties ◽

Secondary Phase ◽

Xrd Analysis ◽

Electrochemical Treatment ◽

Titania Nanotubes ◽

Nanostructured Surface ◽

Nanostructured Surfaces ◽

Zn Content

The current research aim is to biofunctionalize pure titanium (Ti, grade IV) substrate with titania nanotubes and Zn doped hydroxyapatite-based coatings by applying a duplex electrochemical treatment, and to evaluate the influence of Zn content on the physico-chemical properties of hydroxyapatite (HAp). The obtained nanostructured surfaces were covered with HAp-based coatings doped with Zn in different concentrations by electrochemical deposition in pulsed galvanostatic mode. The obtained surfaces were characterized in terms of morphology, elemental and phasic composition, chemical bonds, roughness, and adhesion. The nanostructured surface consisted of titania nanotubes (NT), aligned, vertically oriented, and hollow, with an inner diameter of ~70 nm. X-Ray Diffraction (XRD) analysis showed that the nanostructured surface consists of an anatase phase and some rutile peaks as a secondary phase. The morphology of all coatings consisted of ribbon like-crystals, and by increasing the Zn content the coating became denser due to the decrement of the crystals’ dimensions. The elemental and phase compositions evidenced that HAp was successfully doped with Zn through the pulsed galvanostatic method on the Ti nanostructured surfaces. Fourier Transform Infrared spectroscopy (FTIR) and XRD analysis confirmed the presence of HAp in all coatings, while the adhesion test showed that the addition of a high quantity leads to some delamination. Based on the obtained results, it can be said that the addition of Zn enhances the properties of HAp, and through proper experimental design, the concentration of Zn can be modulated to achieve coatings with tunable features.

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Titania coating formation on hydrostatically extruded pure titanium by micro-arc oxidation method

Journal of Material Science and Technology ◽

10.1016/j.jmst.2021.09.019 ◽

2021 ◽

Author(s):

Ł. Maj ◽

D. Wojtas ◽

A. Jarzębska ◽

M. Bieda ◽

K. Trembecka-Wójciga ◽

...

Keyword(s):

Pure Titanium ◽

Oxidation Method ◽

Micro Arc Oxidation ◽

Coating Formation ◽

Titania Coating

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Tribological functionalization of titanium alloys by Micro-Arc Oxidation for marine applications

MATEC Web of Conferences ◽

10.1051/matecconf/202032109001 ◽

2020 ◽

Vol 321 ◽

pp. 09001

Author(s):

Aude MATHIS ◽

Thierry MILLOT ◽

Vincent BRANGER ◽

Remy MULLER ◽

Jean-Yves GUENEHEUX

Keyword(s):

Friction Coefficient ◽

Titanium Alloys ◽

Pure Titanium ◽

Dynamic Contact ◽

Electrochemical Process ◽

Commercially Pure Titanium ◽

Tribological Behaviour ◽

Stick Slip ◽

Micro Arc Oxidation ◽

Slip Phenomenon

Micro-arc Oxidation (MAO) process is a plasma assisted electrochemical process, which allows formation of ceramic-like dry oxides on top of light alloys surfaces. The good corrosion resistance as well as the low density of titanium alloys are recognized and so required for conception of structural parts in marine environment. However, their tribological behaviour reveals an important tendency to stick-slip phenomenon, which makes use of these alloys for dynamic contact mechanisms difficult. Through the MAO project from IRT M2P, formation of a MAO coating composed of aluminium titanate has been investigated to improve tribological behaviour of a commercially pure titanium (Grade 2) and an α+β alloy (TA6V, Grade 5). Pin-on-disc testing has been carried out to evaluate friction coefficient and the presence or not of stick-slip phenomenon in various contact configurations (involving non-treated titanium surfaces, MAO treated surfaces, with steel or titanium balls …) in dry or artificial seawater media. Those test campaigns are completed by evaluation of fatigue behaviour, and tribological testing on a demonstrator. Finally, this study highlights influence of MAO coating on diminishing (to removed) stick-slip phenomenon, accompanied by a reduction of friction coefficient, whatever the kind of contact (single treated surface or both ones) and the medium.

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Zn- or Cu-Containing CaP-Based Coatings Formed by Micro-arc Oxidation on Titanium and Ti-40Nb Alloy: Part I—Microstructure, Composition and Properties

Materials ◽

10.3390/ma13184116 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4116 ◽

Cited By ~ 2

Author(s):

Ekaterina G. Komarova ◽

Yurii P. Sharkeev ◽

Mariya B. Sedelnikova ◽

Konstantin A. Prosolov ◽

Igor A. Khlusov ◽

...

Keyword(s):

Mechanical Properties ◽

Adhesive Strength ◽

Applied Voltage ◽

Oxidation Process ◽

Pure Titanium ◽

Atomic Ratio ◽

Linear Increase ◽

Microcrystalline Structure ◽

Micro Arc Oxidation ◽

Alloy Part

Zn- and Cu-containing CaP-based coatings, obtained by micro-arc oxidation process, were deposited on substrates made of pure titanium (Ti) and novel Ti-40Nb alloy. The microstructure, phase, and elemental composition, as well as physicochemical and mechanical properties, were examined for unmodified CaP and Zn- or Cu-containing CaP coatings, in relation to the applied voltage that was varied in the range from 200 to 350 V. The unmodified CaP coatings on both types of substrates had mainly an amorphous microstructure with a minimal content of the CaHPO4 phase for all applied voltages. The CaP coatings modified with Zn or Cu had a range from amorphous to nano- and microcrystalline structure that contained micro-sized CaHPO4 and Ca(H2PO4)2·H2O phases, as well as nano-sized β-Ca2P2O7, CaHPO4, TiO2, and Nb2O5 phases. The crystallinity of the formed coatings increased in the following order: CaP/TiNb < Zn-CaP/TiNb < Cu-CaP/TiNb < CaP/Ti < Zn-CaP/Ti < Cu-CaP/Ti. The increase in the applied voltage led to a linear increase in thickness, roughness, and porosity of all types of coatings, unlike adhesive strength that was inversely proportional to an increase in the applied voltage. The increase in the applied voltage did not affect the Zn or Cu concentration (~0.4 at%), but led to an increase in the Ca/P atomic ratio from 0.3 to 0.7.

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Morphology and Wear Resistance of Composite Coatings Formed on a TA2 Substrate Using Hot-Dip Aluminising and Micro-Arc Oxidation Technologies

Materials ◽

10.3390/ma12050799 ◽

2019 ◽

Vol 12 (5) ◽

pp. 799 ◽

Cited By ~ 5

Author(s):

Shaopeng Wang ◽

Lian Zhou ◽

Changjiu Li ◽

Zhengxian Li ◽

Hongzhan Li

Keyword(s):

Wear Resistance ◽

Surface Composition ◽

Pure Titanium ◽

Titanium Substrate ◽

Ceramic Coatings ◽

Oxide Ceramic ◽

Pure Aluminium ◽

X Ray ◽

Micro Arc Oxidation

Aluminium layers were coated onto the surface of pure titanium using hot-dip aluminising technology, and then the aluminium layers were in situ oxidised to form oxide ceramic coatings, using the micro-arc oxidation (MAO) technique. The microstructure and composition distribution of the hot-dip aluminium coatings and ceramic layers were studied by using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The phase structure of the MAO layers was studied using X-ray diffraction. The surface composition of the MAO layer was studied by X-ray photoelectron spectroscopy. The wear resistance of the pure titanium substrate and the ceramic layers coated on its surface were evaluated by using the ball-on-disc wear method. Therefore, aluminising coatings, which consist of a diffusion layer and a pure aluminium layer, could be formed on pure titanium substrates using the hot-dip aluminising method. The MAO method enabled the in-situ oxidation of hot-dip pure aluminium layers, which subsequently led to the formation of ceramic layers. Moreover, the wear resistance values of the ceramic layers were significantly higher than that of the pure titanium substrate.

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Studies on Effect Factors of Porous Titanium Dioxide Film Degrading Azo Dyes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.531.403 ◽

2012 ◽

Vol 531 ◽

pp. 403-406 ◽

Cited By ~ 1

Author(s):

Sheng Min Sun

Keyword(s):

Titanium Dioxide ◽

Ph Value ◽

Uv Light ◽

Pure Titanium ◽

Degradation Process ◽

Porous Titanium ◽

Titanium Dioxide Film ◽

Effect Factors ◽

Micro Arc Oxidation ◽

Dioxide Film

In pure titanium body, through the method of micro-arc oxidation (MAO) on the surface of porous titanium dioxide film and study on factors of methyl orange in the light influence of catalytic degradation process, the results show that: with uv light for the source, pH value of 5, micro-arc oxidation voltage is 400 V, the catalytic activity of porous titanium dioxide film was the highest.

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