Inhibitor-Containing Composite Coatings on Mg Alloys: Corrosion Mechanism and Self-Healing Protection

2015 ◽  
Vol 245 ◽  
pp. 89-96 ◽  
Author(s):  
Andrey S. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Dmitry V. Mashtalyar ◽  
Sergey V. Gnedenkov
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Healing Process ◽  
Corrosion Mechanism ◽  
Self Healing ◽  
Protective Properties ◽  
Oxidation Method ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Electrode Technique

The way of self-healing coating formation at the surface of magnesium alloys by means of plasma electrolytic oxidation method (PEO) with subsequent filling of the obtained layer with inhibitor has been suggested. The electrochemical properties of such coatings have been described in details. The obtained experimental results indicate that the protective properties of the samples with inhibitor-containing coating were increased (IC = 8.6×10–8 A/cm2) in comparison with the samples without coating (5.3×10–5 A/cm2) and the base coating obtained by plasma electrolytic oxidation method (PEO) (3.4×10–7 A/cm2). The local scanning electrochemical methods of surface investigation, notably Scanning Vibrating Electrode Technique (SVET) and Scanning Ion-Selective Electrode Technique (SIET) were used for determining the kinetics and mechanism of the self-healing process. The treatment by the solution containing 8-hydroxyquinoline, which inhibits the corrosion process, enables one to increase the protective properties of the composite coating in 30 times in the corrosion-active environment in comparison with the base PEO-coating and avert the intensive destruction of the material.

scholarly journals Change in the properties of composite coatings during climatic tests in a salt spray chamber

2020 ◽  
pp. 84-90
Author(s):  
Д.В. МАШТАЛЯР ◽  
К.В. НАДАРАИА ◽  
Е.А. БЕЛОВ ◽  
С.Л. СИНЕБРЮХОВ ◽  
С.В. ГНЕДЕНКОВ
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Aqueous Suspension ◽  
Salt Spray ◽  
Composite Layer ◽  
Composite Polymer ◽  
Protective Properties ◽  
Electrolytic Oxidation ◽  
Order Of Magnitude ◽  
Plasma Electrolytic

В статье представлен анализ изменения в ходе климатических испытаний в камере соляного тумана защитных свойств композиционных покрытий, полученных на магниевом сплаве МА8 методом плазменного электролитического оксидирования с последующей обработкой в водной суспензии ультрадисперсного политетра­фторэтилена. Изучена динамика изменения электрохимических свойств композиционных полимерсодержащих покрытий. Оценено влияние кратности нанесения композиционного слоя на стойкость покрытий к коррозии. Установлено, что полимерсодержащее покрытие, полученное плазменным электролитическим оксидированием и трехкратной обработкой в суспензии ультрадисперсного политетрафторэтилена, обладает наибольшей стойкостью к коррозионному разрушению в связи с высокой однородностью получаемого композиционного слоя. После 40 сут нахождения в агрессивной коррозионной среде значения поляризационного сопротивления и модуля импеданса для данного вида покрытия выше на один порядок в сравнении с базовым ПЭО-покрытием до начала испытаний. The paper presents analysis of changes in the protective properties of composite coatings obtained on the MA8 magnesium alloy by plasma electrolytic oxidation followed by treatment in an aqueous suspension of superdispersed polytetrafluoroethylene, during salt spray test. The dynamics of changes in the electrochemical properties of composite polymer-containing coatings was studied. The effect of the multiplicity of the application of the composite layer on the corrosion resistance of the coatings was estimated. It was established that the polymer-containing coating obtained by the plasma electrolytic oxidation and threefold treatment in the superdispersed polytetrafluoroethylene suspension has the highest resistance to corrosion due to the greater homogeneity of the obtained composite layer. After 40 days of exposure to an aggressive corrosive environment, the values of polarization resistance and impedance modulus for this type of coating are one order of magnitude higher than those for the base PEO-coating before test.

Composite coatings formed using plasma electrolytic oxidation and fluoroparaffin materials

2018 ◽  
Vol 767 ◽  
pp. 353-360 ◽  
Author(s):  
D.V. Mashtalyar ◽  
S.V. Gnedenkov ◽  
S.L. Sinebryukhov ◽  
I.M. Imshinetskiy ◽  
A.S. Gnedenkov ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Formation of Protective Coatings on AMg3 Aluminum Alloy Using Fluoropolymer Nanopowder

2020 ◽  
Vol 312 ◽  
pp. 330-334
Author(s):  
Valeriia S. Filonina ◽  
Konstantine V. Nadaraia ◽  
Dmitry V. Mashtalyar ◽  
Andrey S. Gnedenkov ◽  
Igor M. Imshinetsky ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Isopropyl Alcohol ◽  
Protective Coatings ◽  
Composite Coatings ◽  
Protective Properties ◽  
Composite Layers ◽  
Electrolytic Oxidation ◽  
Order Of Magnitude ◽  
Plasma Electrolytic ◽  
Subsequent Modification

The paper presents the results of a study of the protective properties of composite coatings obtained on AMg3 aluminum alloy by plasma electrolytic oxidation (PEO) and subsequent modification of formed oxide layer with superdispersed polytetrafluoroethylene (SPTFE) from a suspension based on isopropyl alcohol. The incorporation of fluoropolymer decreased the porosity of base PEO-coating more than one order of magnitude. Formed composite layers increased wearproof of the samples by more than two orders of magnitude in comparison with PEO-coating. Additionally, polymer-containing coatings has higher adhesion compared to substrate. Formed composite layers possess superhydrophobic properties: contact angle attains 155°.

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.

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