scholarly journals Experimental Studies on Corrosion Behavior of Ceramic Surface Coating using Different Deposition Techniques on 6082-T6 Aluminum Alloy

Processes ◽  
2018 ◽  
Vol 6 (12) ◽  
pp. 240 ◽  
Author(s):  
Ali Algahtani ◽  
Essam Mahmoud ◽  
Sohaib Khan ◽  
Vineet Tirth
Keyword(s):  
Aluminum Alloy ◽  
Surface Coating ◽  
Protective Coatings ◽  
Experimental Studies ◽  
Corrosion Current ◽  
Xrd Analysis ◽  
Ceramic Surface ◽  
Cross Sectional ◽  
Hard Anodizing ◽  
Plasma Electrolytic

Aluminum alloys cannot be used in aggressive corrosion environments application. In this paper, three different surface coating technologies were used to coat the 6082-T6 aluminum alloy to increase the corrosion resistance, namely Plasma Electrolytic Oxidation (PEO), Plasma Spray Ceramic (PSC) and Hard Anodizing (HA). The cross-sectional microstructure analysis revealed that HA coating was less uniform compared to other coatings. PEO coating was well adhered to the substrate despite the thinnest layer among all three coatings, while the PSC coating has an additional loose layer between the coat and the substrate. X-ray diffraction (XRD) analysis revealed crystalline alumina phases in PEO and PSC coatings while no phase was detected in HA other than an aluminum element. A series of electrochemistry experiments were used to evaluate the corrosion performances of these three types of coatings. Generally, all three-coated aluminum showed better corrosion performances. PEO coating has no charge transfer under all Inductive Coupled Plasma (ICP) tests, while small amounts of Al3+ were released for both HA and PSC coatings at 80 °C. The PEO coating showed the lowest corrosion current density followed by HA and then PSC coatings. The impedance resistance decreased as the immersion time increased, which indicated that this is due to the degradation and deterioration of the protective coatings. The results indicate that the PEO coating can offer the most effective protection to the aluminum substrate as it has the highest enhancement factor under electrochemistry tests compared to the other two coatings.

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°.

scholarly journals Wearproof Composite Coatings on Ti

2022 ◽  
Author(s):  
D.V. Mashtalyar
Keyword(s):  
Protective Coatings ◽  
Composite Coatings ◽  
Composite Layer ◽  
Pure Titanium ◽  
Corrosion Current ◽  
Commercially Pure Titanium ◽  
High Adhesion ◽  
Structure Morphology ◽  
Plasma Electrolytic ◽  
Peo Coatings

Abstract. In this work the formation of protective coatings on VT1-0 commercially pure titanium by plasma electrolytic oxidation (PEO) and subsequent fluoropolymer treatment is presented. The structure, morphology, corrosion, and mechanical properties of the formed composite coatings were studied. It was established that PEO coatings are an excellent basis for the formation of a solid composite layer with high adhesion to its surface. The presence of polytetrafluoroethylene in the composition of the coating reduces the corrosion current density by 4 orders of magnitude and increases the wear resistance by 2 orders of magnitude in comparison with the base PEO coating.

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.

Characterizations of Cladded 6082-T6 Aluminum Alloy Through Hard Anodizing

2020 ◽  
Vol 12 (7) ◽  
pp. 1034-1045
Author(s):  
Essam R. I. Mahmoud ◽  
Ali Algahtani ◽  
Sohaib Z. Khan ◽  
Gulam Mohammed Sayeed Ahmed
Keyword(s):  
Aluminum Alloy ◽  
Oil And Gas ◽  
Erosion Resistance ◽  
Corrosion Current ◽  
Aluminum Substrate ◽  
Good Adhesion ◽  
Hard Anodizing ◽  
Wide Range ◽  
Hardness Values ◽  
Aluminum Alloy Surface

Aluminum alloys have attractions to be used for a wide range of applications. Although the passive film on aluminum can provide corrosion protection, it has limited wear resistance in oil and gas applications due to the aggressive environment. This work has investigated the enhancements of hard anodizing on the performance of 6082-T6 aluminum alloy surface against erosion and corrosion test environments. The study investigates the surface roughness and hardness of the hard-anodized coating before going deeper in the cross-section to study in details the macro/microstructure of the formed layer. The erosion resistance of the coated layer, in particular, the effect of sand concentration and temperature variations to the aqueous slurry impingement against material properties such as adhesion, ductility, and roughness were investigated. In addition, a series of electrochemistry tests have been conducted to verify the corrosion performance. As a reference, the un-coated aluminum substrate was instigated in all the experiments. The resulted hard anodized coating layer had good adhesion with the aluminum substrate and was consisted of two distinct amorphous sub-layers of almost 50 m thick with some elongated porosity. It has been shown that the erosion resistance of aluminum alloy can be highly improved by hard anodizing, especially at high temperature. The hard-anodized sample shows almost twice hardness values compared with aluminum substrate for both eroded and un-eroded conditions. For the corrosion behavior, the hard-anodizing coating has lower corrosion current density than the aluminum substrate.

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

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°.

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.

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.

Diagnostics of metal samples using the results of experimental and theoretical study of positively charged microparticles formed upon sample destruction

2018 ◽  
Vol 84 (10) ◽  
pp. 23-28
Author(s):  
D. A. Golentsov ◽  
A. G. Gulin ◽  
Vladimir A. Likhter ◽  
K. E. Ulybyshev
Keyword(s):  
Experimental Data ◽  
Early Stage ◽  
Experimental Studies ◽  
Material Model ◽  
Total Charge ◽  
Cross Sectional ◽  
Practical Applications ◽  
Mechanical And Electrical Properties ◽  
Order Of Magnitude ◽  
Using Data

Destruction of bodies is accompanied by formation of both large and microscopic fragments. Numerous experiments on the rupture of different samples show that those fragments carry a positive electric charge. his phenomenon is of interest from the viewpoint of its potential application to contactless diagnostics of the early stage of destruction of the elements in various technical devices. However, the lack of understanding the nature of this phenomenon restricts the possibility of its practical applications. Experimental studies were carried out using an apparatus that allowed direct measurements of the total charge of the microparticles formed upon sample rupture and determination of their size and quantity. The results of rupture tests of duralumin and electrical steel showed that the size of microparticles is several tens of microns, the particle charge per particle is on the order of 10–14 C, and their amount can be estimated as the ratio of the cross-sectional area of the sample at the point of discontinuity to the square of the microparticle size. A model of charge formation on the microparticles is developed proceeding from the experimental data and current concept of the electron gas in metals. The model makes it possible to determine the charge of the microparticle using data on the particle size and mechanical and electrical properties of the material. Model estimates of the total charge of particles show order-of-magnitude agreement with the experimental data.

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