The Experts below are selected from a list of 87279 Experts worldwide ranked by ideXlab platform
Derek O. Northwood - One of the best experts on this subject based on the ideXlab platform.
-
The role of heat treatment on the erosion–corrosion behavior of AISI 52100 steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Jianhui Xie, Ahmet T. Alpas, Derek O. NorthwoodAbstract:Abstract The role of heat treatment on the erosion and corrosion behavior of 52100 steel was investigated in terms of: (i) Electrochemical parameter measurements, (ii) identification of microstrain and strain energy induced by erosion, and (iii) the characterization of synergistic Effect between erosion and corrosion. Heat-treatment both thermodynamically and kinetically affects the Electrochemical reaction of eroded 52100 steel. Based on both the polarization resistance and corrosion rate measurements, it was found that a tempering treatment gives rise to the slowest corrosion kinetics. For both the annealed and tempered specimens, where the microstrain is created solely from mechanical deformation during erosion, there is a reasonable agreement between the calculated corrosion rate based on a mechano-Electrochemical Effect and the experimentally measured corrosion rate. However, for the quenched specimens in which a high level of microstrain is generated on quenching, there is a significant difference between the calculated (from mechano-Electrochemical Effect) and experimentally measured corrosion rates.
-
The Effect of erosion on the Electrochemical properties of AISI 1020 steel
Journal of Materials Engineering and Performance, 2003Co-Authors: Jianhui Xie, Ahmet T. Alpas, Derek O. NorthwoodAbstract:The mechanisms and characteristics of the mechano-Electrochemical Effect were investigated for eroded AISI 1020 steel specimens. The Effect of erosion on open-circuit potential, corrosion potential, linear polarization resistance, and corrosion rate was determined. The corrosion rate was exponentially related to the decrease in corrosion potential and increase in the strain energy. The corrosion rate was quantitatively calculated using a mechano-Electrochemical dynamic equation, which is based on the decrease in corrosion potential and increase in strain energy. The calculated rate agrees well with the experimentally measured corrosion rate.
-
Mechano-Electrochemical Effect between erosion and corrosion
Journal of Materials Science, 2003Co-Authors: Jianhui Xie, Ahmet T. Alpas, Derek O. NorthwoodAbstract:The characteristics and mechanisms of the mechano-Electrochemical Effect were investigated both theoretically and experimentally for two steels (AISI 1020 and 52100) in various heat-treated conditions subjected to sequential erosion and corrosion. A mathematical equation is developed to describe the mechano-Electrochemical Effect in which the corrosion rate is exponentially related to the change of corrosion potential and increased stored strain energy.
Jung-ki Park - One of the best experts on this subject based on the ideXlab platform.
-
Electrochemical Effect of coating layer on the separator based on PVdF and PE non-woven matrix
Journal of Power Sources, 2005Co-Authors: Yong Min Lee, Nam-soon Choi, Je An Lee, Wan-ho Seol, Ki-yun Cho, Ho-young Jung, Jun-woo Kim, Jung-ki ParkAbstract:Abstract The coated separator was prepared by coating poly(vinyl acetate) (PVAc) on the surface of the novel separator based on poly(vinylidene fluoride) (PVdF) and polyethylene (PE) non-woven matrix. The ionic conductivity of the coated separator was 1.1 × 10 −3 S cm −1 at 25 °C, a little higher than that of bare separator. The coated separator showed smoother surface morphology and better adhesion property toward electrodes, and thereby it resulted in lower total resistance than the bare separator. The discharge capacity of the unit cell with coated separator at C/2 rate was maintained at about 84% of the theoretical capacity, which is quite higher than that of the unit cell with the bare separator.
-
Electrochemical Effect of coating layer on the separator based on PVdF and PE non-woven matrix
Journal of Power Sources, 2005Co-Authors: Yong Min Lee, Nam-soon Choi, Je An Lee, Wan-ho Seol, Ki-yun Cho, Ho-young Jung, Jun-woo Kim, Jung-ki ParkAbstract:The coated separator was prepared by coating poly(vinyl acetate) (PVAc) on the surface of the novel separator based on poly(vinylidene fluoride) (PVdF) and polyethylene (PE) non-woven matrix. The ionic conductivity of the coated separator was 1.1 × 10-3 S cm-1 at 25 °C, a little higher than that of bare separator. The coated separator showed smoother surface morphology and better adhesion property toward electrodes, and thereby it resulted in lower total resistance than the bare separator. The discharge capacity of the unit cell with coated separator at C/2 rate was maintained at about 84% of the theoretical capacity, which is quite higher than that of the unit cell with the bare separator.close151
Jianhui Xie - One of the best experts on this subject based on the ideXlab platform.
-
The role of heat treatment on the erosion–corrosion behavior of AISI 52100 steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Jianhui Xie, Ahmet T. Alpas, Derek O. NorthwoodAbstract:Abstract The role of heat treatment on the erosion and corrosion behavior of 52100 steel was investigated in terms of: (i) Electrochemical parameter measurements, (ii) identification of microstrain and strain energy induced by erosion, and (iii) the characterization of synergistic Effect between erosion and corrosion. Heat-treatment both thermodynamically and kinetically affects the Electrochemical reaction of eroded 52100 steel. Based on both the polarization resistance and corrosion rate measurements, it was found that a tempering treatment gives rise to the slowest corrosion kinetics. For both the annealed and tempered specimens, where the microstrain is created solely from mechanical deformation during erosion, there is a reasonable agreement between the calculated corrosion rate based on a mechano-Electrochemical Effect and the experimentally measured corrosion rate. However, for the quenched specimens in which a high level of microstrain is generated on quenching, there is a significant difference between the calculated (from mechano-Electrochemical Effect) and experimentally measured corrosion rates.
-
The Effect of erosion on the Electrochemical properties of AISI 1020 steel
Journal of Materials Engineering and Performance, 2003Co-Authors: Jianhui Xie, Ahmet T. Alpas, Derek O. NorthwoodAbstract:The mechanisms and characteristics of the mechano-Electrochemical Effect were investigated for eroded AISI 1020 steel specimens. The Effect of erosion on open-circuit potential, corrosion potential, linear polarization resistance, and corrosion rate was determined. The corrosion rate was exponentially related to the decrease in corrosion potential and increase in the strain energy. The corrosion rate was quantitatively calculated using a mechano-Electrochemical dynamic equation, which is based on the decrease in corrosion potential and increase in strain energy. The calculated rate agrees well with the experimentally measured corrosion rate.
-
Mechano-Electrochemical Effect between erosion and corrosion
Journal of Materials Science, 2003Co-Authors: Jianhui Xie, Ahmet T. Alpas, Derek O. NorthwoodAbstract:The characteristics and mechanisms of the mechano-Electrochemical Effect were investigated both theoretically and experimentally for two steels (AISI 1020 and 52100) in various heat-treated conditions subjected to sequential erosion and corrosion. A mathematical equation is developed to describe the mechano-Electrochemical Effect in which the corrosion rate is exponentially related to the change of corrosion potential and increased stored strain energy.
Rainer Waser - One of the best experts on this subject based on the ideXlab platform.
-
ISCAS - Recent progress in redox-based resistive switching
2012 IEEE International Symposium on Circuits and Systems, 2012Co-Authors: Rainer Waser, Stephan Menzel, Vikas RanaAbstract:Recent advancements in resistive switching cell are based on three conduction mechanisms - Electrochemical (ECM), Valence-change (VCM) and thermo-chemical (TCM). In the ECM type cells, migration of anions, typically oxygen ions, towards the anode, and reduction of the cation sublattice provide either metallically or semiconducting phases and triggers a bipolar memory operation. The major factors determining the functionality of the ECM cells are the electrode reaction and the transport kinetics. The VCM type switching is generally observed in metal oxides. Finally, the resistive switching based on the TCM mechanism is discussed. Whenever, this thermo-chemical Effect dominates over the Electrochemical Effect, a unipolar switching behavior is observed. Conductive filament formed during the electroforming process is interpreted as a sequence of threshold switching and subsequent Joule heating, which triggers local redox reactions.
-
on the origin of bistable resistive switching in metal organic charge transfer complex memory cells
Applied Physics Letters, 2007Co-Authors: Thorsten Kever, U Bottger, C Schindler, Rainer WaserAbstract:Electrical characteristics of Cu:tetracyanoquinodimethane (TCNQ) devices with different electrodes were studied. The comparison of impedance spectroscopic measurements on devices with Al and Pt top electrodes proved the existence of a high resistive interface layer between Cu:TCNQ and Al. An equivalent circuit was modeled and the resulting values suggest that the interface layer is composed of naturally formed aluminum oxide. Devices with deliberately formed aluminum oxide and without Cu:TCNQ were fabricated and revealed a similar behavior. The authors propose that the switching Effect in Cu:TCNQ thin film devices is a Cu ion based Electrochemical Effect occurring in a thin aluminum oxide layer.
Niyaz Mohammad Mahmoodi - One of the best experts on this subject based on the ideXlab platform.
-
Electrochemical Effect of Gemini Surfactant and Co-Surfactants on Corrosion Inhibition of Steel in Acid Medium
ECS Transactions, 2019Co-Authors: Dourna Asefi, Mokhtar Arami, Niyaz Mohammad MahmoodiAbstract:The Effect of chain length compatibility on corrosion inhibition Effect of mixed inhibitor systems of cationic gemini surfactant, l,3-butan-bis(Dodecyl Dimethyl Ammonium Bromide) (designated as 12-4-12) with nonionic co-surfactants, C7OH (1-heptanol), C12OH (1dodecanol) and C15OH (1-pentadecanol), on low carbon steel in acid medium was studied using weight loss, open circuit potential (OCP) and Electrochemical impedance spectroscopy (EIS) measurements.
-
Electrochemical Effect of cationic gemini surfactant and halide salts on corrosion inhibition of low carbon steel in acid medium
Meeting Abstracts, 2011Co-Authors: Dourna Asefi, Mokhtar Arami, Niyaz Mohammad MahmoodiAbstract:In this paper, the corrosion inhibition of cationic gemini surfactant 1,4-butan-bis(dimethyl dodecyl ammonium bromide), in the absence and presence of halide salts (NaCl, NaBr and NaI) on steel in HCl was investigated at 20±1 0C. The Effects of pH, immersion time and salt concentration on the corrosion inhibition of steel were studied using weight loss, open circuit potential and Electrochemical impedance spectroscopy. Inhibition efficiency was found to increase with increasing surfactant concentration. Synergistic Effects between the surfactant and the salts were studied. The inhibition efficiency was found to increase with increasing salt concentration. This composite inhibitor containing gemini surfactant and halide was efficient and low-cost for steel corrosion inhibition in HCl.
-
Electrochemical Effect of cationic gemini surfactant and halide salts on corrosion inhibition of low carbon steel in acid medium
Corrosion Science, 2010Co-Authors: Dourna Asefi, Mokhtar Arami, Niyaz Mohammad MahmoodiAbstract:Abstract In this paper, the corrosion inhibition of cationic gemini surfactant, in the absence and presence of halide salts (NaCl, NaBr and NaI) on steel in HCl was investigated at 20 ± 1 °C. The Effects of pH, immersion time and salt concentration on the corrosion inhibition of steel were studied using weight loss, open circuit potential and Electrochemical impedance spectroscopy. Inhibition efficiency increases by increasing surfactant concentration. Synergistic Effect between surfactant and salts was studied. The inhibition efficiency increases by increasing salt concentration. This composite inhibitor containing gemini surfactant and halide was efficient and low-cost for steel corrosion inhibition in HCl.