scholarly journals Metal Ions Supported Porous Coatings by Using AC Plasma Electrolytic Oxidation Processing

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3838 ◽  
Author(s):  
Krzysztof Rokosz ◽  
Tadeusz Hryniewicz ◽  
Steinar Raaen ◽  
Sofia Gaiaschi ◽  
Patrick Chapon ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Orthophosphoric Acid ◽  
Titanium Substrate ◽  
Oxidation States ◽  
Phosphate Coatings ◽  
Cathodic Voltage ◽  
Electrolytic Oxidation ◽  
Anodic Voltage ◽  
Plasma Electrolytic ◽  
Calcium Phosphate Coatings

Coatings enriched with zinc and copper as well as calcium or magnesium, fabricated on titanium substrate by Plasma Electrolytic Oxidation (PEO) under AC conditions (two cathodic voltages, i.e., −35 or −135 V, and anodic voltage of +400 V), were investigated. In all experiments, the electrolytes were based on concentrated orthophosphoric acid (85 wt%) and zinc, copper, calcium and/or magnesium nitrates. It was found that the introduced calcium and magnesium were in the ranges 5.0–5.4 at% and 5.6–6.5 at%, respectively, while the zinc and copper amounts were in the range of 0.3–0.6 at%. Additionally, it was noted that the metals of the block S (Ca and Mg) could be incorporated into the structure about 13 times more than metals of the transition group (Zn and Cu). The incorporated metals (from the electrolyte) into the top-layer of PEO phosphate coatings were on their first (Cu+) or second (Cu2+, Ca2+ and Mg2+) oxidation states. The crystalline phases (TiO and Ti3O) were detected only in coatings fabricated at cathodic voltage of −135 V. It has also been pointed that fabricated porous calcium–phosphate coatings enriched with biocompatible magnesium as well as with antibacterial zinc and copper are dedicated mainly to medical applications. However, their use for other applications (e.g., catalysis and photocatalysis) after additional functionalizations is not excluded.

scholarly journals Characterization of Porous Phosphate Coatings Created on CP Titanium Grade 2 Enriched with Calcium, Magnesium, Zinc and Copper by Plasma Electrolytic Oxidation

2018 ◽  
Author(s):  
Krzysztof Rokosz ◽  
Tadeusz Hryniewicz ◽  
Steinar Raaen ◽  
Sofia Gaiaschi ◽  
Patrick Chapon ◽  
...  
Keyword(s):  
Amorphous Phase ◽  
Plasma Electrolytic Oxidation ◽  
Titanium Substrate ◽  
Porous Coating ◽  
Phosphate Coatings ◽  
Electrolytic Oxidation ◽  
Calcium Magnesium ◽  
Titanium Grade ◽  
Plasma Electrolytic ◽  
Peo Coatings

In the paper, the effect of voltage increasing (from 500 VDC up to 650 VDC) on the structure and chemical composition of porous coating on titanium made by Plasma Electrolytic Oxidation, is presented. In the present paper, phosphates based coatings enriched with calcium, magnesium, zinc and copper in electrolyte based on 1 L of 85% concentrated H3PO4 with additions of Ca(NO3)2·4H2O, and Mg(NO3)2∙6H2O, and Zn(NO3)2∙6H2O, and Cu(NO3)2∙3H2O, are described. The morphology, chemical and phase composition, are evaluated using SEM, EDS, XRD, XPS, GDOES. Based on all the analyses, it was found out that the PEO coatings are porous and enriched with calcium, magnesium, zinc and copper. They consist mainly of the amorphous phase, which is more visible for higher voltages, and it is correlated with the increasing of the total PEO coating thickness (the higher the voltage, the thicker the PEO coating). However, for 650 VDC an amorphous phase and titanium substrate was also recorded with a signal from Ti2P2O7 crystalline, that was not observed for lower voltages. It was also found out that all the obtained coatings may be divided in three sub-layers, i.e. porous, semiporous, and transition one.

scholarly journals COMPARATIVE ANALYSIS OF IMMUNOLOGICAL COMPATIBILITY OF BIOACTIVE CALCIUM PHOSPHATE COATINGS ON TITANIUM AND MAGNESIUM ALLOYS

2017 ◽  
Vol 60 (2) ◽  
pp. 45
Author(s):  
Tatiana S. Zaporozhets ◽  
Tatiana P. Smolina ◽  
Anna K. Gazha ◽  
Artyom V. Puz ◽  
Sergeiy. L. Sinebryukhov ◽  
...  
Keyword(s):  
Innate Immunity ◽  
Calcium Phosphate ◽  
Magnesium Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Phosphate Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
Calcium Phosphate Coatings ◽  
Physical And Chemical

Current strategies for developing the biomaterials suggest passive modulation of osteoinductive and osteoconductive properties of the implant surface through a change in their physical and chemical parameters. Also, the osseointegration of implant depends on the reaction of the immune system, the severity of which is determined by physical and chemical properties of the material and the morphological features of the coating. In this paper, the plasma electrolytic oxidation (PEO) method for the formation of biologically active compositional corrosion resistant calcium phosphate coatings on titanium BT1-0 and magnesium alloy MA8, designed for bone bioengineering was used. Bioactive PEO coatings were additionally treated with superdispersed polytetrafluoroethylene (SPTFE) in order to improve anti-corrosion properties. The cellular and molecular aspects of immunological compatibility of bioactive calcium phosphate coatings formed on titanium and magnesium alloys by promising technology of plasma electrolytic oxidation and intended for bone tissue bioengineering were studied. It is shown that PEO coatings formed on titanium and magnesium induce an activation of human peripheral blood leukocytes in vitro, associated with increased expression of activation of molecules of CD69, CD38, CD11b on the cell membranes while shedding L-selectin (CD62L). Influence of coating process technologies on the intensity of the activation processes was established. Contact cells with calcium-phosphate PEO coatings formed on titanium and magnesium alloys induced a less pronounced activation in comparison with the untreated implants. The minimal reaction of the cells of the innate immunity was observed at using a composite of PEO coatings with SPTFE, obtained by electrophoretic deposition. The composite coating on magnesium alloys induces response of the cells of the innate immunity, comparable with the response to the coatings on titanium alloys. On the whole, immunological characteristics of the PEO coatings on titanium BT1-0 and magnesium alloy of MA8 demonstrate possibility of development of materials and wares for implant surgery, including bioresorbable alloys on magnesium base. For citation:Zaporozhets T.S., Puz A.V., Sinebryukhov S.L., Gnedenkov S.V., Smolina T.P., Gazha A.K. Comparative analysis of immunological compatibility of bioactive calcium phosphate coatings on titanium and magnesium alloys. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 2. P. 45-51.

Cathodic voltage-dependent composition, microstructure and corrosion resistance of plasma electrolytic oxidation coatings formed on Zr-4 alloy

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34616-34624 ◽  
Author(s):  
Yu Wang ◽  
Hui Tang ◽  
Rui Wang ◽  
Yongqiang Tan ◽  
Haibin Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Cathodic Voltage ◽  
Electrolytic Oxidation ◽  
Voltage Dependent ◽  
Plasma Electrolytic

We innovatively regulated the content of t-ZrO2 and m-ZrO2 in the plasma electrolytic oxidation coatings by adjusting the cathodic voltage.

scholarly journals Characterization of Porous Phosphate Coatings Enriched with Magnesium or Zinc on CP Titanium Grade 2 under DC Plasma Electrolytic Oxidation

Metals ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 112 ◽  
Author(s):  
Krzysztof Rokosz ◽  
Tadeusz Hryniewicz ◽  
Sofia Gaiaschi ◽  
Patrick Chapon ◽  
Steinar Raaen ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Dc Plasma ◽  
Phosphate Coatings ◽  
Electrolytic Oxidation ◽  
Titanium Grade ◽  
Plasma Electrolytic ◽  
Porous Phosphate
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