scholarly journals Icephobic Performance of Combined Fluorine-Containing Composite Layers on Al-Mg-Mn–Si Alloy Surface

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3827
Author(s):  
Vladimir S. Egorkin ◽  
Dmitry V. Mashtalyar ◽  
Andrey S. Gnedenkov ◽  
Valeriia S. Filonina ◽  
Igor E. Vyaliy ◽  
...  
Keyword(s):  
Surface Relief ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion Current Density ◽  
Combined Treatment ◽  
Corrosion Current ◽  
Electrochemical Characteristics ◽  
Composite Layers ◽  
Electrolytic Oxidation ◽  
Subsequent Application ◽  
Plasma Electrolytic

This paper presents the results of an evaluation of anti-icing properties of samples obtained by plasma electrolytic oxidation (PEO) with a subsequent application of superdispersed polytetrafluoroethylene (SPTFE) and polyvinylidenefluoride (PVDF). A combined treatment of the samples with SPTFE and PVDF is also presented. It is revealed that impregnation of a PEO layer with fluoropolymer materials leads to a significant increase in surface relief uniformity. Combined PVDF–SPFTE layers with a ratio of PVDF to SPTFE of 1:4 reveal the best electrochemical characteristics, hydrophobicity and icephobic properties among all of the studied samples. It is shown that the decrease in corrosion current density Ic for PVDF–SPFTE coatings is higher by more than five orders of magnitude in comparison with uncoated aluminum alloy. The contact angle for PVDF–SPFTE coatings attain 160.5°, which allows us to classify the coating as superhydrophobic with promising anti-icing performance. A treatment of a PEO layer with PVDF–SPFTE leads to a decrease in ice adhesion strength by 22.1 times compared to an untreated PEO coating.

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 %.

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.

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°.

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.

Effects of Electrolyte Parameters on Properties of Ceramic Coatings Formed on Aluminum Alloy 7075 by Plasma Electrolytic Oxidation

2013 ◽  
Vol 668 ◽  
pp. 875-879
Author(s):  
Jing Guo Miao ◽  
Run Wu ◽  
Qiu Rong Chen ◽  
Kang Da Hao ◽  
Zhong Ling Wei
Keyword(s):  
Aluminum Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion Current ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
Compact Structure ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Α Al2o3 ◽  
Aluminum Alloy 7075

Four electrolyte (aluminate, silicate, borate and phosphate) solutions were optimized for using in surface treatment of 7075 aluminum alloy by plasma electrolytic oxidation. Microstructure, phase composition and corrosion resistance of ceramic coatings on the surface were analyzed by SEM, X-ray diffraction as well as electrochemical work station. It was showed that ceramic coatings prepared in aluminate solution had excellent continuity, compact structure with micro hardness of HV0.1 1100. The major portion of all coatings consisted of γ-Al2O3 and bits of α-Al2O3, the corrosion potential was increased by a small extent while the corrosion current density was significantly reduced.

scholarly journals Anticorrosive non-crystalline coating prepared by plasma electrolytic oxidation for ship low carbon steel pipes

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Chunsheng Ma ◽  
Jian Liu ◽  
Xinhe Zhu ◽  
Wenbin Xue ◽  
Zhijun Yan ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Plasma Electrolytic Oxidation ◽  
Chemical Elements ◽  
Orthogonal Experiment ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Low Carbon ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings

Abstract A corrosion-resistant non-crystalline coating was fabricated by plasma electrolytic oxidation (PEO) on Q235 low carbon steel for ship pipes. The distribution and composition of chemical elements and phases of PEO coatings were analyzed by an orthogonal experiment, and the formation mechanism of PEO coatings was discussed. The corrosion current densities and corrosion potentials were measured. The results indicated that the formation of a transition layer mainly containing Fe3O4 was crucial for achieving an excellent coating quality. Furthermore, the corrosion current density of coated steel was reduced by 78% compared with the bare steel.

Microstructure and Corrosion Resistance of Al2O3-ZrO2 Composite Coating on Biomedical Magnesium Alloy Fabricated by Cathodic Plasma Electrolytic Oxidation

2012 ◽  
Vol 184-185 ◽  
pp. 1068-1071 ◽  
Author(s):  
Yun Long Wang ◽  
Miao Wang ◽  
Zhao Hua Jiang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Composite Coating ◽  
Bonding Strength ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion Current ◽  
Uncoated Sample ◽  
Electrolytic Oxidation ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

A relatively new method called cathodic plasma electrolytic oxidation (CPEO) was development to fabricate Al2O3–ZrO2 composite coating on AZ91 biomedical magnesium alloy. The microstructure and properties of the composite coating including phase composition, surface and cross section morphology, thickness and bonding strength were investigated. The corrosion behavior of the coated magnesium alloy in simulated body fluids(SBF) was primarily evaluated. The results showed that the coating was composed of c-ZrO2, α-Al2O3 and γ-Al2O3. The coating surface was coarse and porous with the average pores diameters of 5 µm. The thickness of the coating was about 60 µm and the bonding strength of coating to the AZ91 substrate was 22 MPa. The polarization test indicated that corrosion potential (Ecorr) and corrosion current density (icorr) of the coated samples in SBF were −1.56V and 8.89×10-7 A/cm2 , respectively, whose corrosion resistance was significantly improved compared to the uncoated sample.

Growth Mechanism and Corrosion Behavior of Ceramic Coatings on CP-Ti Produced by Plasma Electrolytic Oxidation

2010 ◽  
Vol 154-155 ◽  
pp. 896-901
Author(s):  
Ping Yi Guo ◽  
Yong Shao ◽  
Yuan Xin Ji ◽  
Wen Tai Zhu ◽  
Han Yan
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Corrosion Current ◽  
Ceramic Coatings ◽  
Short Treatment ◽  
Linear Behavior ◽  
Electrolytic Oxidation ◽  
Naoh Solution ◽  
Plasma Electrolytic ◽  
Cp Ti ◽  
Passive Current

Ceramic coatings were prepared in situ on commercial pure Ti(CP-Ti) by Plasma Electrolytic Oxidation(PEO) technology in an environmental-friendly solution. The voltage–time responses were recorded during different PEO processes. For short treatment times, the formation processes of ceramic coatings follow a linear kinetics, while for longer times the kinetics departs from the linear behavior. The surficial morphology and composition of the coatings was studies by X-ray diffraction(XRD) and scanning electron microscopy (SEM). The acted electrochemical method was used to evaluate the corrosion of the coated samples in 1moll-1 NaOH solution. The potentiodynamic polarization curves of coated titanium samples and the untreated metal substrate show that the PEO coated titanium samples possess much higher corrosion potential and lower corrosion current than uncoated aluminum alloy. It is noticed that the passive current density of the samples decreased from 10-4A/cm2, for the titanium, to 10-7 A/cm2, for PEO coated titanium sample.

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.

Sign in / Sign up

Export Citation Format

Share Document