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Vahid Dehnavi
University of Western Ontario
9Publications
5H-index
220Citations
Publications 9
Newest
Published on Jan 1, 2019in Corrosion 1.93
W. Jeffrey Binns5
Estimated H-index: 5
(UWO: University of Western Ontario),
Fareshta Zargarzadah1
Estimated H-index: 1
(UWO: University of Western Ontario)
+ 3 AuthorsD.W. Shoesmith27
Estimated H-index: 27
(UWO: University of Western Ontario)
The role of MgH2 in the process of filiform-like corrosion on Mg alloys has been investigated. MgH2 was grown galvanostatically on the Mg ZEK100 alloy at a current density of −5 mA/cm2 for various times in 0.1 M NaOH and the subsequent electrochemical and corrosion behavior compared to that of as-polished specimens. Polarization curves demonstrated cathodic activity under anodic polarization (i.e., the “negative difference effect”) while x-ray diffraction confirmed the presence of MgH2. Dynamic ...
1 Citations Source Cite
Published on Sep 1, 2018in Electrochimica Acta 5.12
Jeffrey D. Henderson5
Estimated H-index: 5
(UWO: University of Western Ontario),
N. Ebrahimi8
Estimated H-index: 8
(UWO: University of Western Ontario)
+ 3 AuthorsJ.J. Noël14
Estimated H-index: 14
(UWO: University of Western Ontario)
Abstract Coupling of metal oxidation in crevice corrosion to both O 2 reduction on surfaces external to the crevice and H + reduction occurring within the crevice, was studied using a galvanostatic crevice corrosion technique in conjunction with weight loss analyses. Results suggest internal H + reduction is a significant contributor to the crevice corrosion of the studied alloys in 5 M NaCl at 120 °C. Repeat experiments suggest damage can be as much as doubled by H + reduction. This process, ho...
3 Citations Source Cite
Published on Sep 1, 2018in Journal of Magnesium and Alloys
Vahid Dehnavi5
Estimated H-index: 5
(UWO: University of Western Ontario),
W.J. Binns1
Estimated H-index: 1
(UWO: University of Western Ontario)
+ 2 AuthorsBen Li Luan4
Estimated H-index: 4
(USTB: University of Science and Technology Beijing)
Abstract Plasma electrolytic oxidation (PEO), a promising surface treatment method to improve the corrosion and wear resistance of magnesium and its alloys, operates at high voltages, resulting in a relatively high energy cost. To make the PEO process more economically viable, its energy efficiency needs to be improved. This study investigates the growth behaviour and microstructural characteristics of low-energy PEO coatings on an AM50 magnesium alloy in a concentrated electrolyte containing so...
2 Citations Source Cite
Published on Jul 1, 2015in Materials Chemistry and Physics 2.21
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)
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 t...
33 Citations Source Cite
Published on May 1, 2015in Surface & Coatings Technology 2.91
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...
23 Citations Source Cite
Published on Sep 1, 2014in Chemical Engineering & Technology 1.59
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...
22 Citations Source Cite
Published on Jul 1, 2014in Surface & Coatings Technology 2.91
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...
41 Citations Source Cite
Published on Jan 1, 2014
Vahid Dehnavi5
Estimated H-index: 5
Plasma Electrolytic Oxidation (PEO) is a surface treatment for the production of ceramic oxide coatings with great properties, such as high wear and corrosion resistance, on metal substrates, particularly aluminum and magnesium alloys. Formation of PEO coatings involves complex processes and mechanisms that are difficult to study. Currently, the PEO process is in a transition phase from research to commercial application, with a primary focus on the corrosion and wear protection of light alloys,...
3 Citations
Published on Jul 1, 2013in Surface & Coatings Technology 2.91
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...
92 Citations Source Cite
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