Duty Cycle of the Polarizing Signal Influence on Morphology and Properties of the PEO-Coating on Aluminium Alloy

2015 ◽  
Vol 245 ◽  
pp. 121-129 ◽  
Author(s):  
Vladimir Egorkin ◽  
Igor Vyaliy ◽  
Sergey Sinebryukhov ◽  
Sergey Gnedenkov
Keyword(s):  
Aluminum Alloy ◽  
Chemical Composition ◽  
Aluminium Alloy ◽  
Duty Cycle ◽  
Plasma Electrolytic Oxidation ◽  
Protective Coatings ◽  
Short Pulse ◽  
Signal Parameter ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Influence of the polarizing signal parameter used during plasma electrolytic oxidation (PEO) on the composition, morphology and properties of protective coatings formed on aluminum alloy in tartrate-containing electrolyte has been presented. It was established, that using of the short-pulse bipolar polarizing signal (τ=5 μs) facilitates the reduction of porosity and roughness of the formed PEO-layers. This, in turn, increases wearproof and protective corrosion characteristics of the treated alloy surface. Increasing the duty cycle (D) affects on the chemical composition and the thickness of the obtained coatings.

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.

Use of waste foundry sand (WFS) to produce protective coatings on aluminum alloy by plasma electrolytic oxidation

2019 ◽  
Vol 222 ◽  
pp. 584-592 ◽  
Author(s):  
Carime dos Santos Souza ◽  
Maria Lúcia Pereira Antunes ◽  
Luiz Veriano Oliveira Dalla Valentina ◽  
Elidiane Cipriano Rangel ◽  
Nilson Cristino da Cruz
Keyword(s):  
Aluminum Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Protective Coatings ◽  
Foundry Sand ◽  
Electrolytic Oxidation ◽  
Waste Foundry Sand ◽  
Plasma Electrolytic

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.

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