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RISS 인기검색어
- 검색키워드
- 저자 : Sinebryukhov (검색결과 6 건)
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Anticorrosion Coatings Obtained by Plasma Electrolytic Oxidation on Implant Metals and Alloys
( S. L. Sinebryukhov ),( S. V. Gnedenkov ),( O. A. Khrisanfova ),( A. V. Puz’ ),( V. S. Egorkin ),( A. G. Zavidnaya ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.3
Development of biodegradable implants for treatment of complex bone fractures has recently become one of the priority areas in biomedical materials research. Multifunctional corrosion resistant and bioactive coatings containing hydroxyapatite Ca<sub>10</sub>(PO<sub>4</sub>)6(OH)<sub>2</sub> and magnesium oxide MgO were obtained on Mg-Mn-Ce magnesium alloy by plasma electrolytic oxidation. The phase and elemental composition, morphology, and anticorrosion properties of the coatings were investigated by scanning electron microscopy, energy dispersive spectroscopy, potentiodynamic polarization, and electrochemical impedance spectroscopy. The PEO-layers were post-treated using superdispersed polytetrafluoroethylene powder. The duplex treatment considerably reduced the corrosion rate (>4 orders of magnitude) of the magnesium alloy. The use of composite coatings in inducing bioactivity and controlling the corrosion degradation of resorbable Mg implants are considered promising. We also applied the plasma electrolytic oxidation method for the formation of the composite bioinert coatings on the titanium nickelide surface in order to improve its electrochemical properties and to change the morphological structure. It was shown that formed coatings significantly reduced the quantity of nickel ions released into the organism.
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Corrosion Monitoring of PEO-Pretreated Magnesium Alloys
Gnedenkov, A.S.,Sinebryukhov, S.L.,Mashtalyar, D.V.,Gnedenkov, S.V.,Sergienko, V.I. The Corrosion Science Society of Korea 2017 Corrosion Science and Technology Vol.16 No.2
The MA8 alloy (formula Mg-Mn-Се) has been shown to have greater corrosion stability than the VMD10 magnesium alloy (formula Mg-Zn-Zr-Y) in chloride-containing solutions by Scanning Vibrating Electrode Technique (SVET) and by optical microscopy, gravimetry, and volumetry. It has been established that the crucial factor for the corrosion activity of these samples is the occurrence of microgalvanic coupling at the sample surface. The peculiarities of the kinetics and mechanism of the corrosion in the local heterogeneous regions of the magnesium alloy surface were investigated by localized electrochemical techniques. The stages of the corrosion process in artificial defects in the coating obtained by plasma electrolytic oxidation (PEO) at the surface of the MA8 magnesium alloy were also studied. The analysis of the experimental data enabled us to determine that the corrosion process in the defect zone develops predominantly at the magnesium/coating interface. Based on the measurements of the corrosion rate of the samples with PEO and composite polymer-containing coatings, the best anticorrosion properties were displayed by the composite polymer-containing coatings.
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Corrosion Monitoring of PEO-Pretreated Magnesium Alloys
( A. S. Gnedenkov ),( S. L. Sinebryukhov ),( D. V. Mashtalyar ),( S. V. Gnedenkov ),( V. I. Sergienko ) 한국부식방식학회 2017 Corrosion Science and Technology Vol.16 No.3
The MA8 alloy (formula Mg-Mn-Се) has been shown to have greater corrosion stability than the VMD10 magnesium alloy (formula Mg-Zn-Zr-Y) in chloride-containing solutions by Scanning Vibrating Electrode Technique (SVET) and by optical microscopy, gravimetry, and volumetry. It has been established that the crucial factor for the corrosion activity of these samples is the occurrence of microgalvanic coupling at the sample surface. The peculiarities of the kinetics and mechanism of the corrosion in the local heterogeneous regions of the magnesium alloy surface were investigated by localized electrochemical techniques. The stages of the corrosion process in artificial defects in the coating obtained by plasma electrolytic oxidation (PEO) at the surface of the MA8 magnesium alloy were also studied. The analysis of the experimental data enabled us to determine that the corrosion process in the defect zone develops predominantly at the magnesium/coating interface. Based on the measurements of the corrosion rate of the samples with PEO and composite polymer-containing coatings, the best anticorrosion properties were displayed by the composite polymer-containing coatings.
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Composite PEO-Coatings as Defence Against Corrosion and Wear: A Review
S. V. Gnedenkov,S. L. Sinebryukhov,V. I. Sergienko,A. S. Gnedenkov 한국부식방식학회 2019 Corrosion Science and Technology Vol.18 No.5
This paper reviews recent approaches to develop composite polymer-containing coatings by plasma electrolyticoxidation (PEO) using various low-molecular fractions of superdispersed polytetrafluoroethylene (SPTFE). The features of the unique approaches to form the composite polymer-containing coating on the surfaceof MA8 magnesium alloy were summarized. Improvement in the corrosion and tribological behavior ofthe polymer-containing coating can be attributed to the morphology and insulating properties of the surfacelayers and solid lubrication effect of the SPTFE particles. Such multifunctional coatings have high corrosionresistance (Rp = 3.0×107 Ω cm2) and low friction coefficient (0.13) under dry wear conditions. The effectof dispersity and x-potential of the nanoscale materials (ZrO2 and SiO2) used as electrolyte componentsfor the plasma electrolytic oxidation on the composition and properties of the coatings was investigated. Improvement in the protective properties of the coatings with the incorporated nanoparticles was explainedby the greater thickness of the protective layer, relatively low porosity, and the presence of narrow non-throughpores. The impedance modulus measured at low frequency for the zirconia-containing layer (|Z|f=0.01 Hz =1.8×106 Ω·cm2) was more than one order of magnitude higher than that of the PEO-coating formed inthe nanoparticles-free electrolyte (|Z|f=0.01 Hz = 5.4×104 Ω·cm2).
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Sergey V. Gnedenkov,Denis P. Opra,Sergey L. Sinebryukhov,Alexander K. Tsvetnikov,Alexander Y. Ustinov,Valentin I. Sergienko 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Electrochemical energy production has been extensively used in large scale applications. At present,organic compounds are considered as efficient and environmentally friendly electrode materials. Thepaper describes the study of the possibility of using hydrolysis lignin as the lithium battery cathodematerial. Hydrolysis lignin features have been investigated by the impedance spectroscopy, scanningelectron microscopy, and energy-dispersive X-ray spectroscopy. The discharge performance ofhydrolysis lignin-based lithium battery was investigated at room temperature using 1 M LiBF4 in gbutyrolactonelectrolyte system. It was found that the specific capacity of hydrolysis lignin was equal to450 mAh g1 at a discharge current density of 25 mA/cm2. Two main voltage plateaus located at ~1.8 and~1.1 V were observed. The chemical composition of cathode materials upon battery discharge down to0.9 V was studied by the X-ray photoelectron spectroscopy and infrared spectroscopy. The suggestionson possible electrochemical reactions occurring in the lithium/hydrolysis lignin system were made onthe basis of the products composition analysis. The results demonstrate the potential of hydrolysis ligninbased batteries to be used as low-rate power sources.
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