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Corrosion properties of plasma electrolytic oxidation coatings on an aluminium alloy – The effect of the PEO process stage

Published on Jul 1, 2015in Materials Chemistry and Physics2.78
· DOI :10.1016/j.matchemphys.2015.04.058
Vahid Dehnavi5
Estimated H-index: 5
(UWO: University of Western Ontario),
David W. Shoesmith32
Estimated H-index: 32
(UWO: University of Western Ontario)
+ 3 AuthorsSohrab Rohani35
Estimated H-index: 35
(UWO: University of Western Ontario)
Cite
Abstract
Abstract Plasma electrolytic oxidation (PEO) coatings were grown on an aluminium alloy substrate using different processing parameters which enabled samples to be coated to different stages of the PEO process. Electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques were employed to investigate the impedance properties of the resulting oxide coatings which will determine the corrosion performance of the coated alloy. Scanning electron microscopy was used to relate the morphology of the coatings with their corrosion performance. A direct relationship was found between the stage of the PEO process, which affects the microstructure of the coatings, and the corrosion performance. Coating thickness and phase composition did not have any measurable influence on coating corrosion performance. To some degree corrosion performance could be tailored by the processing parameters.
  • References (44)
  • Citations (33)
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References44
Newest
Published on May 1, 2015in Surface & Coatings Technology3.19
Vahid Dehnavi5
Estimated H-index: 5
(UWO: University of Western Ontario),
Ben Li Luan4
Estimated H-index: 4
(UWO: University of Western Ontario)
+ 2 AuthorsSohrab Rohani35
Estimated H-index: 35
(UWO: University of Western Ontario)
Abstract Alumina coatings were deposited on 6061 aluminum alloy substrates using plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte. Different electrical parameters, including frequency, duty cycle, and current density were applied to obtain PEO coatings. Scanning electron microscopy (SEM) and microhardness tests were used to investigate the coating microstructure and properties. For each sample, the voltage–time response of the PEO process was obtained and compared with sur...
Published on Sep 1, 2014in Chemical Engineering & Technology2.42
Jamshid Behin12
Estimated H-index: 12
(Razi University),
Syed Salman Bukhari7
Estimated H-index: 7
(UWO: University of Western Ontario)
+ 2 AuthorsSohrab Rohani35
Estimated H-index: 35
(UWO: University of Western Ontario)
The reuse of industrial wastes from a coal-fired power plant and a plasma electrolytic oxidation process was attempted to realize a zero discharge. The batch composition was adjusted by adding sodium hydroxide and sodium aluminate. A single-mode microwave oven equipped with reflux condenser was used for crystallization under atmospheric pressure. The synthesized samples were characterized by X-ray diffraction, scanning electron microscopy, BET, thermogravimetric analysis, and cation-exchange cap...
Published on Aug 1, 2014in Journal of Alloys and Compounds4.17
Hossein Fadaee2
Estimated H-index: 2
(Shiraz University),
Mehdi Javidi12
Estimated H-index: 12
(Shiraz University)
Abstract Plasma electrolytic oxidation treatment was performed on 2024-T3 aluminium alloy in a simple and inexpensive electrolyte. It was found that treatment time of 30 min resulted in the most noble corrosion potential and lowest corrosion current density. The surface and cross-sectional morphology indicated that the coating has a dense structure without any cracking. Furthermore, the result of X-ray diffraction analysis indicated that the coating was formed mainly from α -Al 2 O 3 , γ -Al 2 O...
Published on Jul 1, 2014in Surface & Coatings Technology3.19
Vahid Dehnavi5
Estimated H-index: 5
(UWO: University of Western Ontario),
Xing Yang Liu7
Estimated H-index: 7
(National Research Council)
+ 2 AuthorsSohrab Rohani35
Estimated H-index: 35
(UWO: University of Western Ontario)
Abstract Oxide coatings were produced on a 6061 aluminum alloy using a pulsed unipolar plasma electrolytic oxidation (PEO) process. The effect of electrical parameters including pulse frequency, duty cycle and current density on phase formation in the coatings was revealed using conventional and glancing angle X-ray diffraction. The results show that PEO coatings are mainly composed of γ-Al 2 O 3 . Depending on the electrical parameters employed, the coatings can also contain α-Al 2 O 3 and mull...
Published on Dec 1, 2013in Surface & Coatings Technology3.19
R.O. Hussein7
Estimated H-index: 7
(U of W: University of Windsor),
Derek O. Northwood37
Estimated H-index: 37
(U of W: University of Windsor),
X. Nie8
Estimated H-index: 8
(U of W: University of Windsor)
Abstract Magnesium alloys are considered one of the more promising materials for future use in many engineering applications. However, due to their high chemical and electrochemical reactivity, magnesium alloys have poor corrosion resistance in aqueous environments. Improving their corrosion resistance by coating can greatly extend their application. One promising coating method is plasma electrolytic oxidation (PEO). The nature of the coating formed, and the ultimate corrosion performance depen...
Published on Oct 1, 2013in Surface & Coatings Technology3.19
Ming-an Chen6
Estimated H-index: 6
(CSU: Central South University),
Si-ying Liu1
Estimated H-index: 1
(CSU: Central South University)
+ 2 AuthorsXin-ming Zhang1
Estimated H-index: 1
(CSU: Central South University)
Abstract In order to improve the corrosion resistance of micro arc oxidized coating on 2519 aluminum alloy, a thin layer of polypropylene (PP) film was prepared on its surface. The structure and corrosion protection properties of the coatings were investigated. The corrosion resistance of micro-arc oxidation (MAO) coating can be improved effectively by forming of this kind of thin film due to the physical barrier effect of PP film and the sealing effect of the micro defects in MAO coating by PP....
Published on Sep 1, 2013in Infrared Physics & Technology2.31
Mohannad M.S. Al Bosta5
Estimated H-index: 5
(CHU: Chung Hua University),
Keng-Jeng Ma2
Estimated H-index: 2
(CHU: Chung Hua University),
Hsi-Hsin Chien2
Estimated H-index: 2
(CHU: Chung Hua University)
Abstract MAO ceramic coatings were prepared on aluminium 6061 surfaces at different treating durations (10, 20, ... 60 min), using alkali silicate electrolyte and pulsed bipolar current mode. The surface microstructures and properties were studied using SEM, XRD, EDX and a surface roughness tester. Image-Pro Plus and MATCH! softwares were used to analyze SEM micrographs and XRD results, respectively. The infrared emissivities of the ceramic coatings were measured at the 70 °C using FTIR spectrom...
Published on Jul 1, 2013in Surface & Coatings Technology3.19
Vahid Dehnavi5
Estimated H-index: 5
(UWO: University of Western Ontario),
Ben Li Luan4
Estimated H-index: 4
(UWO: University of Western Ontario)
+ 2 AuthorsSohrab Rohani35
Estimated H-index: 35
(UWO: University of Western Ontario)
Abstract Ceramic coatings were created on the surface of 6061 aluminum alloy using a plasma electrolytic oxidation (PEO) process employing a pulsed direct current (DC) power mode in an alkaline electrolyte. The effect of electrical parameters including frequency and duty cycle on the microdischarge behavior and coating growth was investigated at constant current. Surface features of coatings were studied using scanning electron microscopy. Energy dispersive spectroscopy was employed to investiga...
Published on Jul 1, 2013in Corrosion1.86
J.B. Bajat2
Estimated H-index: 2
(University of Belgrade),
Vasilić R2
Estimated H-index: 2
+ 1 AuthorsV. Mišković-Stanković1
Estimated H-index: 1
Electrochemical properties of oxide coatings formed by plasma electrolytic oxidation (PEO) on aluminum in sodium tungstate (Na2WO4·2H2O) with respect to process time were investigated using electrochemical impedance spectroscopy (EIS). Presence of tungsten was beneficial for the corrosion stability of obtained oxide coatings. However, neither the amount of tungsten in the oxide coating nor the coatings thickness were identified as important factors in corrosion stability of PEO coatings, i.e., m...
Published on Oct 1, 2012in Applied Surface Science5.16
Junghoon Lee12
Estimated H-index: 12
(PNU: Pusan National University),
Yonghwan Kim7
Estimated H-index: 7
(PNU: Pusan National University),
Won-Sub Chung12
Estimated H-index: 12
(PNU: Pusan National University)
Abstract Argon gas was bubbled during plasma electrolytic oxidation (PEO) treatment of magnesium alloy in a silicate solution. The appearance of arcs and plasma discharging was locally concentrated on the magnesium alloy surface and phase fraction of Mg 2 SiO 4 in the oxide layer was increased due to Argon gas bubbling. The higher energy density of the Ar plasma atmosphere is believed to contribute to the effective formation of the high temperature phase (Mg 2 SiO 4 ), particularly in the inner ...
Cited By33
Newest
Published on Oct 1, 2019in Applied Surface Science5.16
Yulin Ge3
Estimated H-index: 3
(HIT: Harbin Institute of Technology),
Yaming Wang29
Estimated H-index: 29
(HIT: Harbin Institute of Technology)
+ 5 AuthorsYu Zhou43
Estimated H-index: 43
(HIT: Harbin Institute of Technology)
Abstract Plasma electrolytic oxidation (PEO) coatings were formed, respectively in three silicate-based, phosphate-based and aluminate-based electrolytes on niobium, with the aim to explore the relationships between electrolyte composition, dielectric breakdown behavior and corresponding corrosion resistance. The initial growth stages of the anodic coatings were studied, and result shows that an impedance falling stage (from about 200 V to 400 V) starts at the emergence of spark discharge accomp...
Published on May 1, 2019in Electrochimica Acta5.38
Aleksey B. Rogov1
Estimated H-index: 1
(University of Manchester),
A. Matthews60
Estimated H-index: 60
(University of Manchester),
Aleksey Yerokhin21
Estimated H-index: 21
(University of Manchester)
Abstract Advanced surface engineering processes based on polarisation-driven electrochemical reactions can be easily programmed and automated using feedback loops and digital models of the process. Being a distinctive feature of Industry 4.0 manufacturing strategy, such intelligent electrochemical approaches require in-depth understanding of the relations between polarisation conditions, electrical response and surface properties, which are of critical importance for process modelling. In this s...
Published on Sep 1, 2019in Materials Characterization3.22
Jalal Kangazian3
Estimated H-index: 3
(IUT: Isfahan University of Technology),
M. Shamanian25
Estimated H-index: 25
(IUT: Isfahan University of Technology)
Abstract The aim of this research was to study the effect of the welding current mode on the microtexture and corrosion behavior of UNS S32750 stainless steel/UNS N08825 Ni-based superalloy welds. The weldments were fabricated using pulsed current (PC) and continuous current (CC) gas tungsten arc welding. The electron backscatter diffraction analysis was used to evaluate the microtexture and boundaries characteristics of the weldments. Corrosion behavior of the weld metals was also investigated ...
Published on Jun 1, 2019in Surface & Coatings Technology3.19
V. Ntomprougkidis (University of Lorraine), Julien Martin7
Estimated H-index: 7
(University of Lorraine)
+ 1 AuthorsGérard Henrion13
Estimated H-index: 13
(University of Lorraine)
Abstract Oxide coatings were produced on a 2024 aluminium alloy using a pulsed bipolar current plasma electrolytic oxidation (PEO) process in an alkaline electrolyte. The use of sequences including various current waveforms during the same treatment was investigated, mainly by applying various combinations of two different anodic to cathodic charge quantity ratio (RCQ = 0.9 and 6.0). The morphology of the produced PEO coatings was observed using scanning electron microscopy while the behaviour o...
Published in Materials2.97
Andrey S. Gnedenkov7
Estimated H-index: 7
,
S. L. Sinebryukhov18
Estimated H-index: 18
+ -3 AuthorsS. V. Gnedenkov18
Estimated H-index: 18
The paper studies microstructure, chemical composition and corrosion activity of the tungsten inert gas welded joint of the Al-Mg-Sc alloy. An intensive corrosion attack of the heat affected zone (HAZ) was found due to precipitation of secondary phases at recrystallized grain boundaries. The ccorrosion process initiated along the boundary of α-Al grains, where a high concentration of anodic (Mg2Si and Mg2Al3) and cathodic phases ((MnFe)Al6) was observed. Increased temperatures during welding led...
Published on Jun 1, 2019in Key Engineering Materials
A.S. Gnedenkov5
Estimated H-index: 5
(RAS: Russian Academy of Sciences),
S. L. Sinebryukhov18
Estimated H-index: 18
(RAS: Russian Academy of Sciences)
+ 1 AuthorsS. V. Gnedenkov18
Estimated H-index: 18
(RAS: Russian Academy of Sciences)
Published on May 3, 2019in Transactions of The Indian Institute of Metals1.18
Jalal Kangazian3
Estimated H-index: 3
(IUT: Isfahan University of Technology),
M. Shamanian25
Estimated H-index: 25
(IUT: Isfahan University of Technology)
This work addressed the effect of pulsed current (PC) and pass number on the microstructure, mechanical properties and corrosion behavior of Incoloy 825/UNS S32750 welds. The alloys were welded using PC and continuous current techniques. Mechanical properties of the weldments were examined using hardness, Charpy and transverse tensile tests. General corrosion and pitting corrosion behavior of the weld metals were studied using potentiodynamic polarization and electrochemical impedance spectrosco...
Published on Feb 7, 2019
This paper describes a design approach to a control system of power supply for high-voltage electrochemical processes such as plasma electrolytic oxidation (PEO) or high-voltage anodising (HVA), which require alternating polarisation pulses up to 750 V and a typical current density of 50–500 mA/cm2. Complex characteristics of the electrochemical system response on applied polarisations (positive or negative) cause necessity of precise control of polarising pulse shapes for better process operati...