scholarly journals Wearproof Composite Coatings on Ti

2022 ◽  
Author(s):  
D.V. Mashtalyar
Keyword(s):  
Protective Coatings ◽  
Composite Coatings ◽  
Composite Layer ◽  
Pure Titanium ◽  
Corrosion Current ◽  
Commercially Pure Titanium ◽  
High Adhesion ◽  
Structure Morphology ◽  
Plasma Electrolytic ◽  
Peo Coatings

Abstract. In this work the formation of protective coatings on VT1-0 commercially pure titanium by plasma electrolytic oxidation (PEO) and subsequent fluoropolymer treatment is presented. The structure, morphology, corrosion, and mechanical properties of the formed composite coatings were studied. It was established that PEO coatings are an excellent basis for the formation of a solid composite layer with high adhesion to its surface. The presence of polytetrafluoroethylene in the composition of the coating reduces the corrosion current density by 4 orders of magnitude and increases the wear resistance by 2 orders of magnitude in comparison with the base PEO coating.

Formation and Properties of the PVDF/PEO-Coatings on Commercially Pure Titanium

2015 ◽  
Vol 245 ◽  
pp. 144-152
Author(s):  
Vladimir Egorkin ◽  
Igor Vyaliy ◽  
Denis Opra ◽  
Alexander Sokolov ◽  
Sergey Sinebryukhov ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Titanium ◽  
Corrosion Current ◽  
Commercially Pure Titanium ◽  
Oxide Coatings ◽  
Electrochemical Tests ◽  
Commercially Pure ◽  
Anticorrosion Coatings ◽  
Plasma Electrolytic ◽  
Peo Coatings

Plasma electrolytic oxidation (PEO) of commercially pure titanium VT1-0 was performed in phosphate electrolyte. High-frequency 200 kHz bipolar signal at a duty cycle D=0.1 was used to form the oxide coatings. Polymer-containing anticorrosion coatings were formed by applying polyvinylidene fluoride (PVDF) on the base PEO-coating. The results of electrochemical tests have showed a decrease of corrosion current density by 2 orders of magnitude (down to 1.5∙10-10 А∙сm-2) and the corresponding increase of the polarization resistance (up to 1.9∙108 Оhm∙сm2) in comparison with the metallic substrate.

scholarly journals Comparison of Biocompatible Coatings Produced by Plasma Electrolytic Oxidation on cp-Ti and Ti-Zr-Nb Superelastic Alloy

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 401
Author(s):  
Ruzil Farrakhov ◽  
Olga Melnichuk ◽  
Evgeny Parfenov ◽  
Veta Mukaeva ◽  
Arseniy Raab ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Electrochemical Impedance ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
X Ray ◽  
Kinetic Coefficients ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Cp Ti ◽  
Peo Coatings

The paper compares the coatings produced by plasma electrolytic oxidation (PEO) on commercially pure titanium and a novel superelastic alloy Ti-18Zr-15Nb (at. %) for implant applications. The PEO coatings were produced on both alloys in the identical pulsed bipolar regime. The properties of the coatings were examined using scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS). The PEO process kinetics was modeled based on the Avrami theorem and Cottrell equation using a relaxation method. The resultant coatings contain TiO2, for both alloys, and NbO2, Nb2O5, ZrO2 for Ti-18Zr-15Nb alloy. The coating on the Ti-18Zr-15Nb alloy has a higher thickness, porosity, and roughness compared to that on cp-Ti. The values of the kinetic coefficients of the PEO process—higher diffusion coefficient and lower time constant for the processing of Ti-18Zr-15Nb—explain this effect. According to the electrochemical studies, PEO coatings on Ti-18Zr-15Nb alloy provide better corrosion protection. Higher corrosion resistance, porosity, and roughness contribute to better biocompatibility of the PEO coating on Ti-18Zr-15Nb alloy compared to cp-Ti.

Formation of PEO-Coatings for Implants Materials

2020 ◽  
Vol 312 ◽  
pp. 309-313
Author(s):  
Konstantine V. Nadaraia ◽  
Arina I. Pleshkova ◽  
Mariia A. Piatkova ◽  
Igor M. Imshinetsky ◽  
Dmitry V. Mashtalyar ◽  
...  
Keyword(s):  
Bone Mineralization ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Cellular Processes ◽  
Commercially Pure ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
Uncoated Titanium ◽  
Biocompatible Coatings

The paper presents results of investigation of biocompatible coatings on VT1-0 commercially pure titanium formed using plasma electrolytic oxidation (PEO) method. The effects of samples with different surface treatment on the functional activity of cells innate immunity have been studied. The study of enzymes has showed the higher stimulation of cellular metabolism during the first hour of contact with the PEO-coating in comparison with the uncoated titanium. The smallest immunostimulatory influence has been obtained for PEO-coating. It has been established that PEO-layers on titanium affect the functional state of cellular processes accompanying bone mineralization.

scholarly journals Improvement of Mechanical and Corrosion Properties of Commercially Pure Titanium Using Alumina PEO Coatings

Coatings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 29
Author(s):  
Viorel Malinovschi ◽  
Alexandru Horia Marin ◽  
Catalin Ducu ◽  
Sorin Moga ◽  
Victor Andrei ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Corrosion Properties ◽  
Commercially Pure ◽  
Electrolytic Oxidation ◽  
Aluminum Oxide Layer ◽  
Plasma Electrolytic ◽  
Cp Ti ◽  
Peo Coatings

In this study, the surface of commercially pure titanium (Cp-Ti) was covered by a 21–95 µm-thick aluminum oxide layer using plasma electrolytic oxidation. Coating characterization revealed the formation of nodular and granular α- and γ-Al2O3 phases with minor amounts of TiAl2O5 and Na2Ti4O9 which yielded a maximum 49.0 GPa hardness and 50 N adhesive critical load. The corrosion resistance behavior in 3.5 wt.% NaCl solution of all plasma electrolytic oxidation (PEO) coatings was found to be two orders of magnitude higher compared to bare Ti substrate.

Formation of Composite Coatings Using Fluoropolymer Materials

2015 ◽  
Vol 245 ◽  
pp. 103-108 ◽  
Author(s):  
Konstantine Nadaraia ◽  
Dmitry Mashtalyar ◽  
Sergey Gnedenkov ◽  
Sergey Sinebryukhov
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Subsequent Treatment ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings

Surface modification of magnesium alloys by plasma electrolytic oxidation (PEO) and subsequent treatment with suspension of superdispersed polytetrafluoroethylene and tetrafluoroethylene telomeric solution are presented. Electrochemical, mechanical properties and wettability of obtained composite coatings were investigated. The polymer-containing coatings decrease the corrosion current and wear by orders of magnitude as compared to unprotected magnesium alloy and base PEO-coatings.

scholarly journals Self-Lubricating PEO–PTFE Composite Coating on Titanium

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 170 ◽  
Author(s):  
Limei Ren ◽  
Tengchao Wang ◽  
Zhaoxiang Chen ◽  
Yunyu Li ◽  
Lihe Qian
Keyword(s):  
Composite Coating ◽  
Tribological Properties ◽  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Pure Titanium ◽  
Tio2 Coating ◽  
Commercially Pure Titanium ◽  
Ptfe Composite ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

A self-lubricating plasma electrolytic oxidation–polytetrafluoroethylene (PEO–PTFE) composite coating was successfully fabricated on the surface of commercially pure titanium by a multiple-step method of plasma electrolytic oxidation, dipping and sintering treatment. The microstructure and tribological properties of the PEO–PTFE composite coating were investigated and compared with the PEO TiO2 coating and the PTFE coating on titanium. Results show that most of the micro-pores of the PEO TiO2 coating were filled by PTFE and the surface roughness of PEO–PTFE composite coating was lower than that of the PEO TiO2 coating. Furthermore, the PEO–PTFE composite coating shows excellent tribological properties with low friction coefficient and low wear rate. This study provides an insight for guiding the design of self-lubricating and wear-resistant PEO composite coatings.

Protective Coatings Formed by PEO and Fluorine-Containing Compound

2018 ◽  
Vol 386 ◽  
pp. 343-348
Author(s):  
Konstantine V. Nadaraia ◽  
Sergey V. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Dmitry V. Mashtalyar
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Protective Coatings ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Subsequent Treatment ◽  
Organofluorine Compound ◽  
Hydrophobic Properties ◽  
Composite Layers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Composite coatings have been obtained by plasma electrolytic oxidation method and subsequent treatment with fluorine-containing compound: suspension of superdispersed polytetrafluoroethylene. A method of formation of the protective coating by dipping into the suspension of organofluorine compound with subsequent heat treatment has been developed. The surface morphology of samples, their electrochemical and tribological properties, as well as wettability have been studied. Formed composite coatings reduce the corrosion current density and wear more than two orders of magnitude in comparison with the base PEO-coating. Additionally, composite layers have hydrophobic properties: for polymer-containing coatings the value of contact angle attains to 143±2°.

scholarly journals Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4121 ◽  
Author(s):  
Dmitry V. Mashtalyar ◽  
Konstantine V. Nadaraia ◽  
Andrey S. Gnedenkov ◽  
Igor M. Imshinetskiy ◽  
Mariia A. Piatkova ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Electrochemical Impedance ◽  
Pure Titanium ◽  
Corrosion Current ◽  
Bare Metal ◽  
Commercially Pure Titanium ◽  
Bioactive Coatings ◽  
Commercially Pure ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Bioactive coatings on VT1-0 commercially pure titanium were formed by the plasma electrolytic oxidation (PEO). A study of the morphological features of coatings was carried out using scanning electron microscopy. A composition of formed coatings was investigated using energy-dispersive spectroscopy and X-ray diffractometry analysis. It was shown that PEO-coatings have calcium phosphate in their composition, which increases the bioactivity of the surface layer. Electrochemical properties of the samples were studied by potentiondynamic polarization and electrochemical impedance spectroscopy in different physiological media: simulated body fluid and minimum essential medium. The data of electrochemical studies indicate more than 15 times decrease in the corrosion current density for the sample with coating (5.0 × 10−9 A/cm2) as compared to the bare titanium (7.7 × 10−8 A/cm2). The formed PEO-layers have elastoplastic properties close to human bone (12–30 GPa) and a lower friction coefficient in comparison with bare metal. The wettability of PEO-layers increased. The contact angle for formed coatings reduced by more than 60° in comparison with bare metal (from 73° for titanium to 8° for PEO-coating). Such an increase in surface hydrophilicity contributes to the greater biocompatibility of the formed coating in comparison with commercially pure titanium. PEO can be prospective as a method for improving titanium surface bioactivity.

Composite Coatings Formed on PEO Pretreated MA8 Magnesium Alloy in Aqueous Suspension of PTFE

2021 ◽  
Vol 885 ◽  
pp. 95-102
Author(s):  
Evgeny A. Belov ◽  
Konstantine V. Nadaraia ◽  
Dmitry V. Mashtalyar ◽  
Igor M. Imshinetsky ◽  
Andrey P. German ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Aqueous Suspension ◽  
Corrosion Current ◽  
Composite Polymer ◽  
Corrosion Properties ◽  
Composite Layers ◽  
Electrolytic Oxidation ◽  
Subsequent Application ◽  
Plasma Electrolytic ◽  
Scratch Tests

The paper presents results of the composite polymer-containing layers formation by plasma electrolytic oxidation (PEO) with subsequent application of the superdispersed polytetrafluoroethylene (SPTFE) aqueous suspension. The corrosion properties and adhesion of coatings have been investigated using potentiodynamic polarization and scratch tests. Incorporation of SPTFE decreased the corrosion current density for composite layers by more than 3 orders of magnitude in comparison with the base PEO-coating and increased the coatings adhesion by 30 %.

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

2017 ◽  
Vol 17 (2) ◽  
pp. 41-54 ◽  
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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