Electrochemical and Mechanical Properties of the PVDF/PEO-Coatings on Magnesium Alloy

2015 ◽  
Vol 245 ◽  
pp. 130-136
Author(s):  
Vladimir Egorkin ◽  
Igor Vyaliy ◽  
Denis Opra ◽  
Sergey Sinebryukhov ◽  
Sergey Gnedenkov
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Polarization Resistance ◽  
Polyvinylidene Fluoride ◽  
Oxide Coatings ◽  
Complete Destruction ◽  
Electrolytic Oxidation ◽  
Subsequent Application ◽  
Plasma Electrolytic ◽  
Peo Coatings

The paper presents the results of the study of electrochemical and mechanical properties of PVDF/PEO-coatings formed on magnesium alloy MA8 by plasma electrolytic oxidation (PEO) and subsequent application of polyvinylidene fluoride (PVDF) on the PEO-layer. The oxide coatings were formed using a 300 Hz bipolar signal with duty cycle (D) 0.50. The analysis of electrochemical data has showed a decrease of corrosion currents by 3 orders of magnitude (down to 6.0·10-9 А·сm-2) and an increase of the polarization resistance by 3 orders of magnitude (up to 5.3·106 Оhm·сm2) for the coatings formed by triple dipping (x3) of the PEO-layers into PVDF solution. Evaluation of the tribological properties of the (x3) PVDF/PEO-coatings has showed a significant increase of the wear resistance (the number of abrasion cycles resulting in complete destruction of the coating increased in 25 times) as compared to the base PEO-layer.

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.

Incorporation of Composite Zirconia-Silica Nanoparticles into PEO-Coatings on Magnesium Alloys

2018 ◽  
Vol 386 ◽  
pp. 321-325
Author(s):  
Igor M. Imshinetsky ◽  
Sergey V. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Dmitry V. Mashtalyar ◽  
Andrew V. Samokhin ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Silica Nanoparticles ◽  
Magnesium Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Protective Coatings ◽  
Surface Layers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
The Way

The way of protective coatings formation on MA8 magnesium alloy by plasma electrolytic oxidation (PEO) in the electrolyte containing composite zirconia-silica nanoparticles has been developed. It is shown that the coatings, which contain nanoparticles, have a significant advantage in comparison with the surface layers obtained without their use.

Influence of Plasma Electrolytic Oxidation coating on corrosion characteristics of Friction Stir Welded ZE41 rare earth Magnesium alloy

2021 ◽  
Author(s):  
N Sivashanmugam ◽  
KL Harikrishna ◽  
S R Koteswara Rao ◽  
N Rameshbabu ◽  
P Manojkumar
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Dense Layer ◽  
Metallographic Examination ◽  
Friction Stir ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Abstract Magnesium and its alloys are extensively used in the defence, aerospace and automotive industries, owing to their excellent mechanical properties. But there is a requirement of corrosion prevention treatment before using it for applications, since the corrosion resistance of Mg alloy is poor. In this work, a study on the mechanical properties of friction stir welded ZE41 rare earth magnesium alloy thick plates of 15mm and 25mm, was carried out. A metallographic examination and mechanical tests were conducted on both the welds. Furthermore, Plasma Electrolytic Oxidation (PEO), a surface conversion treatment was carried out on both the base material as well as on the friction stir butt joints. X-ray diffraction and scanning electron microscopy analysis were carried out on all the samples, with and without coating. The coated and uncoated samples were assessed by potentiodynamic polarisation (PDP) tests and electrochemical impedance spectroscopy (EIS) to study the electrochemical corrosion behaviour. An outer porous layer and an inner dense layer, have been identified from the SEM images. From the corrosion tests results it was revealed that there was an improvement in the corrosion resistance of both the base metal as well as the weldments by the PEO coating process.

Electrophoretic Composite Coatings on Magnesium Alloys

2015 ◽  
Vol 245 ◽  
pp. 97-102
Author(s):  
Dmitry V. Mashtalyar ◽  
Sergey V. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Igor M. Imshinetsky
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Electrophoretic Deposition ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion Current Density ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Investigation results of the composite coatings obtained on MA8 magnesium alloy by plasma electrolytic oxidation (PEO) and post-treated by electrophoretic deposition of superdispersed polytetrafluoroethylene (SPTFE) are presented. Comprehensive research of electrochemical and mechanical properties of the obtained polymer-containing coatings on the magnesium alloy has been performed. It has been established that composite coatings to decrease the corrosion current density by three orders of magnitude (down to Ic = 2.0×10-10 A/cm2) and the wear by two orders of magnitude (down to 1.2×10-6 mm3/(N·m)), as compared to the basic PEO-coating.

scholarly journals Formation and Properties of Oxide Coatings with Immobilized Zeolites Obtained by Plasma Electrolytic Oxidation of Aluminum

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1241
Author(s):  
Kristina Mojsilović ◽  
Uroš Lačnjevac ◽  
Srna Stojanović ◽  
Ljiljana Damjanović-Vasilić ◽  
Stevan Stojadinović ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Processing Time ◽  
Water Solution ◽  
Activity Levels ◽  
Oxide Coatings ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Chemical And Phase Compositions ◽  
Plasma Electrolytic ◽  
Peo Coatings

In this paper, we employed plasma electrolytic oxidation (PEO) of aluminum in a water solution of sodium tungstate (Na2WO4∙2H2O) with the addition of the pure and Ce-loaded zeolites clinoptilolite and 13 X for the preparation of oxide coatings. The obtained coatings were characterized with respect to their morphologies and chemical and phase compositions using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, atomic force microscopy, and X-ray diffraction. The prepared coatings contained γ-alumina, WO3, and metallic tungsten. The surface morphologies of the obtained coatings strongly depended on the PEO processing time; the roughness of all coatings increased with PEO time, while porosity decreased with PEO processing time as a result of microdischarge coalescence and growth. All coatings contained elements originating from the substrate and from the electrolytes. Coatings containing zeolites with Ce showed higher photoactivity than those with immobilized pure zeolites. The highest photocatalytic activity levels were observed for coatings containing immobilized Ce-exchanged clinoptilolite processed for 10 min. It was observed that both clinoptilolite and 13X zeolites improved the features of the PEO coatings in a similar manner, making natural and abundant clinoptilolite an excellent candidate for various applications.

scholarly journals Formation of PEO Coatings Modified by SiC Nanoparticles on the MA8 Magnesium Alloy

2021 ◽  
Vol 346 ◽  
pp. 02021
Author(s):  
Dmitry V. Mashtalyar ◽  
Igor M. Imshinetskiy ◽  
Konstantine V. Nadaraia ◽  
Marina V. Sidorova ◽  
Sergey L. Sinebryukhov ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Magnesium Alloy ◽  
Adhesive Strength ◽  
Plasma Electrolytic Oxidation ◽  
Surface Layers ◽  
Properties Of Coatings ◽  
Sic Nanoparticles ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings

The properties of coatings formed on the MA8 magnesium alloy by the plasma electrolytic oxidation in electrolytes containing silicon carbide nanoparticles in concentrations of 2, 4 and 6 g/l have been investigated. It has been shown that coatings, which contain nanoparticles, have a significant advantage in microhardenss and adhesive strength in comparison with the surface layers obtained without their use.

Morphology and Chemical Composition of Organic Coatings Formed Atop PEO-Layers

2020 ◽  
Vol 312 ◽  
pp. 325-329
Author(s):  
Vladimir S. Egorkin ◽  
Ulyana V. Kharchenko ◽  
Nikolay V. Izotov ◽  
Igor E. Vyaliy ◽  
Andrey S. Gnedenkov ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Barrier Properties ◽  
Organic Coating ◽  
Organic Coatings ◽  
High Adhesion ◽  
Electrolytic Oxidation ◽  
Subsequent Application ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
Anticorrosion Properties

The plasma electrolytic oxidation (PEO) process was used to form an oxide layer on an Al5754 aluminum alloy for subsequent application of organic coating. The effect of the oxidation time on the morphology and anticorrosion properties of PEO-coatings was investigated. The oxide layer possess low apparent porosity and provides high adhesion to the paint. The resulting composite coating (CC) is characterized by high barrier properties in chloride solution.

scholarly journals Fabrication of Coatings on the Surface of Magnesium Alloy by Plasma Electrolytic Oxidation Using ZrO2and SiO2Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
S. V. Gnedenkov ◽  
S. L. Sinebryukhov ◽  
D. V. Mashtalyar ◽  
I. M. Imshinetskiy ◽  
A. V. Samokhin ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Polarization Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Morphological Characteristics ◽  
Properties Of Coatings ◽  
Protective Properties ◽  
Electrolytic Oxidation ◽  
Mechanical Performances ◽  
Plasma Electrolytic ◽  
Zirconia Nanoparticles

Results of investigation of the incorporation of zirconia and silica nanoparticles into the coatings formed on magnesium alloy by plasma electrolytic oxidation are presented. Comprehensive research of electrochemical and mechanical properties of obtained coatings was carried out. It was established that the polarization resistance of the samples with a coating containing zirconia nanoparticles is two times higher than that for the sample with base PEO layer. One of the important reasons for improving the protective properties of coatings formed in electrolytes containing nanoparticles consists in enhanced morphological characteristics, in particular, the porosity decrease and increase of thickness and resistivity (up to two orders of magnitude for ZrO2-containing coating) of porousless sublayer in comparison with base PEO layer. Incorporation of silica and zirconia particles into the coating increases the mechanical performances. The layers containing nanoparticles have greater hardness and are more wear resistant in comparison with the coatings formed in the base electrolyte.

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