scholarly journals Plasma electrolytic oxidation technology for producing protective coatings of aluminum alloys

2021 ◽  
Vol 317 (2) ◽  
pp. 78-93
Author(s):  
G.B. Yeshmanova ◽  
◽  
D.U. Smagulov ◽  
C. Blawert ◽  
◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
High Performance ◽  
Protective Coatings ◽  
Chemical Properties ◽  
High Hardness ◽  
Ceramic Coatings ◽  
Oxide Ceramic ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Today, the technology of hardening the surface layers of parts and the creation of protective coatings on the surface with high physical, mechanical and chemical properties is particularly effective. The article reviews the most promising innovative technologies for surface hardening of aluminum alloys – plasma electrolytic oxidation (PEO). Possible conditions and mechanisms for the formation of protective coatings on the surface of aluminum alloys are considered. The influence of the main parameters of PEO processing (electrical parameters, composition and concentration of electrolyte, the influence of alloying elements) on the structure and properties of oxide-ceramic coatings has been studied. The qualitative characteristics of the surface layer of samples and finished products made of aluminum alloys have shown the effectiveness of the PEO technology, which makes it possible to obtain ceramic coatings with high hardness, strength, increased wear and corrosion resistance. Possible areas of application of high-performance technologies for the deposition of protective PEO coatings on the surface of products made of aluminum alloys are proposed.

Simultaneous Reduction of Wear and Corrosion of Titanium, Magnesium and Zirconium Alloys by Surface Plasma Electrolytic Oxidation Treatment

2008 ◽  
Vol 38 ◽  
pp. 27-35 ◽  
Author(s):  
H.M. Nykyforchyn ◽  
V.S. Agarwala ◽  
M.D. Klapkiv ◽  
V.M. Posuvailo
Keyword(s):  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Synthesis Method ◽  
Zirconium Alloys ◽  
Ceramic Coatings ◽  
Oxide Ceramic ◽  
Wear And Corrosion ◽  
Electrolytic Oxidation ◽  
Wear And Corrosion Resistance ◽  
Plasma Electrolytic

Titanium, magnesium and zirconium alloys are widely used in industrial applications, which require high wear and corrosion resistance. However current methods of improving these properties often do not satisfy the requirements of service and functional properties. An alternative approach is the application of oxide-ceramic coatings using high temperature process. The coatings are applied by spark discharge plasma in the metal-electrolyte system at high voltages - PEO (plasma electrolytic oxidation) as an oxide synthesis method. This method has shown good results for aluminium alloys and with good prospects to be used for titanium, magnesium and zirconium alloys. Development of PEO technology to improve the wear and corrosion resistance of titanium, magnesium and zirconium alloys is discussed in this paper. It describes the methods for obtaining the required layer-thickness for a specified hardness, porosity, wear and corrosion resistance, sets up the optimal process parameters (voltage/current) by taking the relation of anodic to cathodic currents into account, and establishing the electrolyte content of different dopants.

scholarly journals The role of hydrogen in the formation of oxide-ceramic layers on aluminum alloys during their plasma-electrolytic oxidation

2021 ◽  
Author(s):  
Volodymyr Hutsaylyuk ◽  
Mykhailo Student ◽  
Volodymyr Posuvailo ◽  
Oleksandra Student ◽  
Volodymyr Hvozdets’kyi ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Oxide Ceramic ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

scholarly journals Introduction to Plasma Electrolytic Oxidation—An Overview of the Process and Applications

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 628 ◽  
Author(s):  
Frank Simchen ◽  
Maximilian Sieber ◽  
Alexander Kopp ◽  
Thomas Lampke
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Strong Electric Field ◽  
Ceramic Coatings ◽  
Substrate Material ◽  
Oxide Ceramic ◽  
Plasma State ◽  
Electrolytic Oxidation ◽  
Oxide Ceramic Coatings ◽  
Micro Arc Oxidation ◽  
Plasma Electrolytic

Plasma electrolytic oxidation (PEO), also called micro-arc oxidation (MAO), is an innovative method in producing oxide-ceramic coatings on metals, such as aluminum, titanium, magnesium, zirconium, etc. The process is characterized by discharges, which develop in a strong electric field, in a system consisting of the substrate, the oxide layer, a gas envelope, and the electrolyte. The electric breakdown in this system establishes a plasma state, in which, under anodic polarization, the substrate material is locally converted to a compound consisting of the substrate material itself (including alloying elements) and oxygen in addition to the electrolyte components. The review presents the process kinetics according to the existing models of the discharge phenomena, as well as the influence of the process parameters on the process, and thus, on the resulting coating properties, e.g., morphology and composition.

scholarly journals Corrosion properties of amg3 aluminum alloy treated by short-pulse plasma electrolytic oxidation in marine conditions

2021 ◽  
pp. 117-121
Author(s):  
В.С. Егоркин ◽  
И.Е. Вялый ◽  
Н.В. Изотов ◽  
А.Н. Минаев ◽  
С.Л. Синебрюхов ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Sea Water ◽  
Protective Coatings ◽  
Short Pulse ◽  
Salt Spray ◽  
Corrosion Properties ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Алюминиевые сплавы находят все более широкое применение в морской технике как для строительства корпусов судов, так и для изготовления различного судового оборудования, трубопроводов и других устройств. Однако применение алюминиевых сплавов в элементах морской техники, подвергающихся прямому контакту с морской водой или работающих в условиях морской атмосферы, требует дополнительного изучения и разработки мер по улучшению антикоррозионных свойств. Формирование защитных покрытий на поверхности алюминиевых сплавов методом плазменного электролитического оксидирования (ПЭО) позволяет повысить антикоррозионные характеристики. В работе представлены результаты комплексных исследований коррозионной стойкости и морфологии ПЭО-покрытий, сформированных на алюминиевом сплаве АМг3, в камере соляного тумана и при натурных испытаниях в морской воде и в морской атмосфере. Показано, что обработка алюминиевого сплава АМг3 методом плазменного электролитического оксидирования с использованием короткоимпульсного поляризующего сигнала приводит к улучшению коррозионных характеристик формируемого покрытия. Aluminum alloys are increasingly used in marine engineering both for the construction of ship hulls and for the manufacture of various ship equipment, pipelines and other devices. However, the use of aluminum alloys in elements of marine technology exposed to direct contact with sea water or operating in the sea atmosphere requires additional study and development of ways to improve anticorrosion properties. The formation of protective coatings on the surface of aluminum alloys by the method of plasma electrolytic oxidation (PEO) enable one to increase the anticorrosive characteristics. The paper presents the results of comprehensive studies of the corrosion resistance and morphology of PEO coatings formed on the AMg3 aluminum alloy in a salt spray chamber and during field tests in sea water and in the marine atmosphere. It is shown that the treatment of the AMg3 aluminum alloy by the method of plasma electrolytic oxidation with the use of a short-pulse polarizing signal leads to an improvement in the corrosion characteristics of the formed coating.

scholarly journals Surface Modification of Aluminum 6061-O Alloy by Plasma Electrolytic Oxidation to Improve Corrosion Resistance Properties

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 4
Author(s):  
Dmitry V. Dzhurinskiy ◽  
Stanislav S. Dautov ◽  
Petr G. Shornikov ◽  
Iskander Sh. Akhatov
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Electrochemical Impedance ◽  
High Strength ◽  
Electrolytic Oxidation ◽  
Coating Layers ◽  
Plasma Electrolytic ◽  
High Strength Aluminum Alloys

In the present investigation, the plasma electrolytic oxidation (PEO) process was employed to form aluminum oxide coating layers to enhance corrosion resistance properties of high-strength aluminum alloys. The formed protective coating layers were examined by means of scanning electron microscopy (SEM) and characterized by several electrochemical techniques, including open circuit potential (OCP), linear potentiodynamic polarization (LP) and electrochemical impedance spectroscopy (EIS). The results were reported in comparison with the bare 6061-O aluminum alloy to determine the corrosion performance of the coated 6061-O alloy. The PEO-treated aluminum alloy showed substantially higher corrosion resistance in comparison with the untreated substrate material. A relationship was found between the coating formation stage, process parameters and the thickness of the oxide-formed layers, which has a measurable influence on enhancing corrosion resistance properties. This study demonstrates promising results of utilizing PEO process to enhance corrosion resistance properties of high-strength aluminum alloys and could be recommended as a method used in industrial applications.

Plasma Electrolytic Oxidation (PEO) Coatings on Aluminum Alloys: Kinetics and Formation Mechanism

2019 ◽  
Author(s):  
Alex Lugovskoy ◽  
Lyubov Snizhko
Keyword(s):  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Anodic Polarization ◽  
Point Of View ◽  
Alkaline Solutions ◽  
Inorganic Polymers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
First Time

In this review, the main kinetics and mechanism regularities of plasma electrolytic oxidation (PEO) of aluminum alloys are discussed. The material and heat balances of the PEO process, including anomalous gas evolution and possible thermochemical reactions are presented for the first time. Side effects accompanying spark discharges from both the surface and the electrolyte sides are analyzed. The influences of electrical regime (direct, alternative, and pulse current) on the rate of coatings growth are summarized from the electrochemical point of view. Different modes of anodic polarization and electrolyte composition (alkaline solutions with inorganic polymers and dispersed constituents) are discussed in the applicative aspect.

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