The Experts below are selected from a list of 8553 Experts worldwide ranked by ideXlab platform
Farzin Ghadami - One of the best experts on this subject based on the ideXlab platform.
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Comparative tribological study of air plasma sprayed WC–12%Co coating versus conventional hard chromium Electrodeposit
Tribology International, 2010Co-Authors: M. Heydarzadeh Sohi, Farzin GhadamiAbstract:Abstract In this work, the properties of air plasma sprayed WC–12%Co coating before and after heat treatment were compared with the properties of the hard chromium Electrodeposit. WC–12%Co coatings were heat treated at 650, 900 and 1150 °C for 1 h in an argon atmosphere. XRD patterns confirmed the formation of an amorphous phase in the as-sprayed coating. This amorphous phase gradually transformed to η -carbides in the course of heat treatment of the coating. This transformation was confirmed by the XRD analysis of the coatings heat treated above 900 °C. Pin-on-disc wear test results showed that WC–12%Co coatings had a significantly better tribological performance as compared with that of the hard chromium Electrodeposits. The results also indicated that heat treatment of the WC–12%Co coatings at 900 °C gave the highest wear resistance among the coatings, which was due to the formation of hard η -carbides at this temperature.
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comparative tribological study of air plasma sprayed wc 12 co coating versus conventional hard chromium Electrodeposit
Tribology International, 2010Co-Authors: Heydarzadeh M Sohi, Farzin GhadamiAbstract:Abstract In this work, the properties of air plasma sprayed WC–12%Co coating before and after heat treatment were compared with the properties of the hard chromium Electrodeposit. WC–12%Co coatings were heat treated at 650, 900 and 1150 °C for 1 h in an argon atmosphere. XRD patterns confirmed the formation of an amorphous phase in the as-sprayed coating. This amorphous phase gradually transformed to η -carbides in the course of heat treatment of the coating. This transformation was confirmed by the XRD analysis of the coatings heat treated above 900 °C. Pin-on-disc wear test results showed that WC–12%Co coatings had a significantly better tribological performance as compared with that of the hard chromium Electrodeposits. The results also indicated that heat treatment of the WC–12%Co coatings at 900 °C gave the highest wear resistance among the coatings, which was due to the formation of hard η -carbides at this temperature.
Heydarzadeh M Sohi - One of the best experts on this subject based on the ideXlab platform.
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comparative tribological study of air plasma sprayed wc 12 co coating versus conventional hard chromium Electrodeposit
Tribology International, 2010Co-Authors: Heydarzadeh M Sohi, Farzin GhadamiAbstract:Abstract In this work, the properties of air plasma sprayed WC–12%Co coating before and after heat treatment were compared with the properties of the hard chromium Electrodeposit. WC–12%Co coatings were heat treated at 650, 900 and 1150 °C for 1 h in an argon atmosphere. XRD patterns confirmed the formation of an amorphous phase in the as-sprayed coating. This amorphous phase gradually transformed to η -carbides in the course of heat treatment of the coating. This transformation was confirmed by the XRD analysis of the coatings heat treated above 900 °C. Pin-on-disc wear test results showed that WC–12%Co coatings had a significantly better tribological performance as compared with that of the hard chromium Electrodeposits. The results also indicated that heat treatment of the WC–12%Co coatings at 900 °C gave the highest wear resistance among the coatings, which was due to the formation of hard η -carbides at this temperature.
Gery R Stafford - One of the best experts on this subject based on the ideXlab platform.
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Electrodeposition of silver aluminum alloys from a room temperature chloroaluminate molten salt
Journal of The Electrochemical Society, 2001Co-Authors: Charles L Hussey, Gery R StaffordAbstract:The Electrodeposition of silver-aluminum alloys was investigated at platinum and tungsten electrodes in the Lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride (AlCl 3 -EtMelmCl) molten salt containing electrogenerated silver(I) at 25°C. Sampled-current voltammetry indicated that it is possible to Electrodeposit Ag-Al alloys at potentials positive of that where the bulk deposition of aluminum is normally observed (∼0 V). The aluminum content of these alloys varied with the applied potential and displayed an inverse dependence on the silver(I) concentration, indicating that the alloy formation process was kinetically limited. Experiments conducted in melts with different compositions revealed that at a fixed potential and silver(I) concentration. the atomic fraction of aluminum in the alloy is virtually independent of the melt composition. At high concentrations, silver(I) adsorbs on platinum and tungsten, but this process is inhibited by the addition of benzene. The adsorption process does not appear to affect the codeposition of aluminum with silver. X-ray diffraction analysis of bulk Ag-Al alloy Electrodeposits prepared in melt containing benzene as a cosolvent indicated the presence of both face-centered cubic Ag and hexagonal close-packed δ-Ag 2 Al.
Suojiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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surface morphology crystal structure and orientation of aluminium coatings Electrodeposited on mild steel in ionic liquid
Chemical Engineering Journal, 2009Co-Authors: Xingmei Lu, Xiangping Zhang, Suojiang ZhangAbstract:Galvano-static Electrodeposition was used to Electrodeposit aluminium on mild steel in AlCl(3)/[bmim]Cl (1-butyl-3-methylimidazolium chloride) ionic liquid at variable temperatures (308-328 K). Effects of variations in current density and temperature on surface morphology and crystal orientations were systematically studied. Results show current density certainly caused changes in the morphology and deposit microstructure, and the type of deposit microstructure changed rapidly as a function of temperature, especially at higher current density. It was indicated that all of the Electrodeposits exhibited a strong preferred (2 0 0) crystallographic orientation. Compared with the (2 00) reflection, the preferred (2 2 2) orientation was relatively weak for most samples. and under higher temperature and Current density it disappears. The (I 1 11), (2 2 0). and (3 1 1) reflections were relatively weak. (C) 2008 Elsevier B.V. All rights reserved.
A. Chitharanjan Hegde - One of the best experts on this subject based on the ideXlab platform.
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Corrosion behavior of composition modulated multilayer Zn–Co Electrodeposits produced using a single-bath technique
Journal of Applied Electrochemistry, 2008Co-Authors: V. Thangaraj, N. Eliaz, A. Chitharanjan HegdeAbstract:Composition modulated alloy (CMA) Electrodeposits of Zn–Co were produced from acid chloride baths by the single-bath technique. Their corrosion behavior was evaluated as a function of the switched cathode current densities and the number of layers. The process was optimized with respect to the highest corrosion resistance. Enhanced corrosion resistance was obtained when the outer layer was slightly richer with cobalt. At the optimum switched current densities 40/55 mA cm^−2, a coating with 600 layers showed ~6 times higher corrosion resistance than monolithic Zn–Co Electrodeposit having the same thickness. The CMA coating exhibited red rust only after 1,130 h in a salt-spray test. The increased corrosion resistance of the multilayer alloys was related to their inherent barrier properties, as revealed by Electrochemical Impedance Spectroscopy. The corrosion resistance was explained in terms of n -type semiconductor films at the interface as supported by Mott–Schottky plots.