The Experts below are selected from a list of 9969 Experts worldwide ranked by ideXlab platform
Guangling Song - One of the best experts on this subject based on the ideXlab platform.
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corrosion mechanism and evaluation of anodized magnesium alloys
Corrosion Science, 2014Co-Authors: Guangling Song, Zhiming ShiAbstract:The corrosion of anodized Mg alloys is investigated by means of immersion, salt spray, Polarization Curve, AC electrochemical impedance spectroscopy (EIS), SEM and optical microscopy analyses. Based on the blocking, retarding and passivating effects of an anodized coating on corrosion of Mg alloys, a corrosion model is proposed to illustrate the corrosion reaction at the coating/substrate interface in coating through-pores. It is found that EIS can sensitively respond to the occurrence of corrosion in anodized Mg alloys and reflect the protection performance of anodized coatings, which may be used as an in situ method of monitoring corrosion for anodized Mg alloys.
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2 hydroxy 4 methoxy acetophenone as an environment friendly corrosion inhibitor for az91d magnesium alloy
Corrosion Science, 2013Co-Authors: Dezhi Zeng, Zhi Zhang, Taihe Shi, Guangling Song, Xingpeng GuoAbstract:Abstract The inhibition behavior of 2-hydroxy-4-methoxy-acetophenone (paeonol) as an environment-friendly corrosion inhibitor for AZ91D magnesium alloy was investigated in 0.05 wt.% NaCl solution by means of Polarization Curve, AC impedance, weight loss measurement, scanning electron microscopy, Fourier transformation infrared spectroscopy, ultraviolet analysis, and computer molecular simulation. The results show that paeonol can inhibit the corrosion of AZ91D. The maximum inhibition efficiency is achieved when paeonol concentration is 50 ppm by weight in this study. It is proposed that paeonol chelates with Mg to form a paeonol-Mg complex mixing with the original Mg(OH) 2 film on the surface to inhibit the anodic dissolution of AZ91D.
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direct electroless nickel boron plating on az91d magnesium alloy
Surface & Coatings Technology, 2012Co-Authors: Zhoucheng Wang, Lu Yu, Zhengbing Qi, Y Tang, Guangling SongAbstract:Abstract A Ni–B coating was electroless-deposited directly on acetic acid pickled AZ91D. The plating rate was found to be influenced by pH, temperature, and bath composition. The electroless Ni–B plating exhibits a uniform surface and an amorphous structure. Polarization Curve and electrochemical impedance spectroscopy measurements in 3.5 wt.% sodium chloride aqueous solution suggest that the plating can protect the magnesium alloy substrate from corrosion attack. It is proposed that different deposition reactions dominate in different stages of the plating process.
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boundary element method predictions of the influence of the electrolyte on the galvanic corrosion of az91d coupled to steel
Materials and Corrosion-werkstoffe Und Korrosion, 2005Co-Authors: Jimmy Xueshan Jia, Guangling Song, Andrej AtrensAbstract:This research investigated the galvanic corrosion of the magnesium alloy AZ91D coupled to steel. The galvanic current distribution was measured in 5% NaCl solution, corrosive water and an auto coolant. The experimental measurements were compared with predictions from a Boundary Element Method (BEM) model. The boundary condition, required as an input into the BEM model, needs to be a Polarization Curve that accurately reflects the corrosion process. Provided that the Polarization Curve does reflect steady state, the BEM model is expected to be able to reflect steady state galvanic corrosion.
Y Song - One of the best experts on this subject based on the ideXlab platform.
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effects of scan rate on the potentiodynamic Polarization Curve obtained to determine the tafel slopes and corrosion current density
Corrosion Science, 2009Co-Authors: Xuelin Zhang, Zh H Jiang, Y Song, Zh D WuAbstract:Effects of charging current on the potentiodynamic Polarization Curve that is obtained to determine the Tafel slopes and corrosion current density are reported in this paper. The potentiodynamic Polarization Curves are obtained at different scan rates for Ti6Al4V in naturally aerated 3.5% NaCl solution. The results show that the potential where the external current density equals to zero does not equal to the open circuit potential. The extent of the distortion of the Polarization Curve can be reflected the difference between the two potentials. Some significant errors are introduced into the values of the corrosion current density and Tafel slopes due to this distortion. In addition, severe distortion of the Polarization Curve can lead to misunderstanding of the electrode process. A new method is adopted to eliminate this distortion, and the potential-dependent of charging current density can also be obtained.
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effects of scan rate on the potentiodynamic Polarization Curve obtained to determine the tafel slopes and corrosion current density
Corrosion Science, 2009Co-Authors: Xuelin Zhang, Zh H Jiang, Zh P Yao, Y SongAbstract:Effects of charging current on the potentiodynamic Polarization Curve that is obtained to determine the Tafel slopes and corrosion current density are reported in this paper. The potentiodynamic Polarization Curves are obtained at different scan rates for Ti6Al4V in naturally aerated 3.5% NaCl solution. The results show that the potential where the external current density equals to zero does not equal to the open circuit potential. The extent of the distortion of the Polarization Curve can be reflected the difference between the two potentials. Some significant errors are introduced into the values of the corrosion current density and Tafel slopes due to this distortion. In addition, severe distortion of the Polarization Curve can lead to misunderstanding of the electrode process. A new method is adopted to eliminate this distortion, and the potential-dependent of charging current density can also be obtained.
Xuelin Zhang - One of the best experts on this subject based on the ideXlab platform.
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effects of scan rate on the potentiodynamic Polarization Curve obtained to determine the tafel slopes and corrosion current density
Corrosion Science, 2009Co-Authors: Xuelin Zhang, Zh H Jiang, Y Song, Zh D WuAbstract:Effects of charging current on the potentiodynamic Polarization Curve that is obtained to determine the Tafel slopes and corrosion current density are reported in this paper. The potentiodynamic Polarization Curves are obtained at different scan rates for Ti6Al4V in naturally aerated 3.5% NaCl solution. The results show that the potential where the external current density equals to zero does not equal to the open circuit potential. The extent of the distortion of the Polarization Curve can be reflected the difference between the two potentials. Some significant errors are introduced into the values of the corrosion current density and Tafel slopes due to this distortion. In addition, severe distortion of the Polarization Curve can lead to misunderstanding of the electrode process. A new method is adopted to eliminate this distortion, and the potential-dependent of charging current density can also be obtained.
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effects of scan rate on the potentiodynamic Polarization Curve obtained to determine the tafel slopes and corrosion current density
Corrosion Science, 2009Co-Authors: Xuelin Zhang, Zh H Jiang, Zh P Yao, Y SongAbstract:Effects of charging current on the potentiodynamic Polarization Curve that is obtained to determine the Tafel slopes and corrosion current density are reported in this paper. The potentiodynamic Polarization Curves are obtained at different scan rates for Ti6Al4V in naturally aerated 3.5% NaCl solution. The results show that the potential where the external current density equals to zero does not equal to the open circuit potential. The extent of the distortion of the Polarization Curve can be reflected the difference between the two potentials. Some significant errors are introduced into the values of the corrosion current density and Tafel slopes due to this distortion. In addition, severe distortion of the Polarization Curve can lead to misunderstanding of the electrode process. A new method is adopted to eliminate this distortion, and the potential-dependent of charging current density can also be obtained.
Thomas A. Zawodzinski - One of the best experts on this subject based on the ideXlab platform.
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Polarization Curve analysis of all-vanadium redox flow batteries
Journal of Applied Electrochemistry, 2011Co-Authors: Doug Aaron, Zhijiang Tang, Alexander B. Papandrew, Thomas A. ZawodzinskiAbstract:We outline the analysis of performance of redox flow batteries (RFBs) using Polarization Curves. This method allows the researcher immediate access to sources of performance losses in flow batteries operating at steady state. We provide guidance on ‘best practices’ for use of this tool, illustrated using examples from single cells operating as vanadium redox batteries.
A Laperriere - One of the best experts on this subject based on the ideXlab platform.
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characterization of a ballard mk5 e proton exchange membrane fuel cell stack
Fuel Cells, 2001Co-Authors: F Laurencelle, Jean Hamelin, Richard Chahine, T K Bose, Kodjo Agbossou, M. Fournier, A LaperriereAbstract:We present the results of an experimental investigation of the energy balance of a Ballard MK5-E proton exchange membrane fuel cell (PEMFC) stack. We have investigated the transient phenomena that occur during PEMFC stack warm-up, under load switching, and when the PEMFC stack is connected to a DC/AC inverter. A simple and convenient model describing the Polarization Curve as a function of the temperature is presented and validated by our experimental data. We also present experimental results on the increase PEMFC stack performance as a function of the current density for different oxygen concentrations of the oxidant gas.
