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Alicia Esther Ares - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
    Arabian Journal of Chemistry, 2018
    Co-Authors: Claudia Marcela Méndez, Verónica Liliana Scheiber, Roberto S. Rozicki, Alex Iván Kociubczyk, Alicia Esther Ares
    Abstract:

    Abstract In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and 8.9 wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed. Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and Sn-8.9 wt.%Zn) corresponding to longitudinal section present a pseudo Passive Zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed Zones of Sn-8.9 wt.%Zn are the only ones that do not have this pseudo Passive region. In addition, the interdendritic Zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed Zones. In addition, the columnar Zones of Sn-4 wt.%Zn and Sn-8.9 wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed Zone of Sn-1 wt.%Zn alloy is less susceptible to corrosion than the columnar Zone. After adjustment by equivalent circuits it is revealed that the equiaxed Zone of Sn-8.9 wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface.

  • Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
    Elsevier, 2018
    Co-Authors: Claudia Marcela Méndez, Verónica Liliana Scheiber, Roberto S. Rozicki, Alex Iván Kociubczyk, Alicia Esther Ares
    Abstract:

    In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and 8.9 wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed.Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and Sn-8.9 wt.%Zn) corresponding to longitudinal section present a pseudo Passive Zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed Zones of Sn-8.9 wt.%Zn are the only ones that do not have this pseudo Passive region. In addition, the interdendritic Zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed Zones. In addition, the columnar Zones of Sn-4 wt.%Zn and Sn-8.9 wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed Zone of Sn-1 wt.%Zn alloy is less susceptible to corrosion than the columnar Zone. After adjustment by equivalent circuits it is revealed that the equiaxed Zone of Sn-8.9 wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface. Keywords: Sn-Zn alloys, Corrosion, EIS, NaCl, Grain structure

H. Teng - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of fiber motion during wet filament winding of composite cylinders with arbitrary thickness
    International Journal of Solids and Structures, 1992
    Co-Authors: A. Agah-tehrani, H. Teng
    Abstract:

    Abstract A continuum consolidation model is proposed for macroscopic analysis of fiber motion during filament winding of thermoset composite cylinders with arbitrary thickness. The model takes account of the variation of both instantaneous stiffness and permeability of the mixture with fiber compaction. Due to resin filtration, structure of the resulting initial-boundary value problem is similar to that of a moving boundary problem. Based on this analogy, a finite difference scheme is devised for the solution of the problem. For the case of winding onto a rigid mandrel, the results point to the existence of an active and a Passive Zone of consolidation. The results further indicate the possibility that during hoop winding of relatively thick cylinders, the tension can be completely lost in the portion of the Passive Zone away from the mandrel.

  • A Model for Wet Filament Winding of Composite Cylinders with Arbitrary Thickness
    1991
    Co-Authors: A. Agah-tehrani, H. Teng
    Abstract:

    Abstract : A continuum consolidation is purposed for analyzing the filament winding of thermoset composite cylinders with arbitrary thickness. The model takes account of the variation of both the instantaneous stiffness and the permeability of the mixture with fiber compaction. Due to resin filtration, the structure of the resulting initial-boundary value problem is similar to that of a moving boundary problem. Based on this analogy, a finite difference scheme is devised for the solution of the problem. For the case of winding onto a rigid mandrel, the results point to the existence of an active and a Passive Zone of consolidation. The results further indicate the possibility that during hoop winding of relatively thick cylinders, the tension can be completely lost in the portion of the Passive Zone away from the mandrel.

Claudia Marcela Méndez - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
    Arabian Journal of Chemistry, 2018
    Co-Authors: Claudia Marcela Méndez, Verónica Liliana Scheiber, Roberto S. Rozicki, Alex Iván Kociubczyk, Alicia Esther Ares
    Abstract:

    Abstract In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and 8.9 wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed. Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and Sn-8.9 wt.%Zn) corresponding to longitudinal section present a pseudo Passive Zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed Zones of Sn-8.9 wt.%Zn are the only ones that do not have this pseudo Passive region. In addition, the interdendritic Zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed Zones. In addition, the columnar Zones of Sn-4 wt.%Zn and Sn-8.9 wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed Zone of Sn-1 wt.%Zn alloy is less susceptible to corrosion than the columnar Zone. After adjustment by equivalent circuits it is revealed that the equiaxed Zone of Sn-8.9 wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface.

  • Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
    Elsevier, 2018
    Co-Authors: Claudia Marcela Méndez, Verónica Liliana Scheiber, Roberto S. Rozicki, Alex Iván Kociubczyk, Alicia Esther Ares
    Abstract:

    In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and 8.9 wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed.Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and Sn-8.9 wt.%Zn) corresponding to longitudinal section present a pseudo Passive Zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed Zones of Sn-8.9 wt.%Zn are the only ones that do not have this pseudo Passive region. In addition, the interdendritic Zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed Zones. In addition, the columnar Zones of Sn-4 wt.%Zn and Sn-8.9 wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed Zone of Sn-1 wt.%Zn alloy is less susceptible to corrosion than the columnar Zone. After adjustment by equivalent circuits it is revealed that the equiaxed Zone of Sn-8.9 wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface. Keywords: Sn-Zn alloys, Corrosion, EIS, NaCl, Grain structure

A. Agah-tehrani - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of fiber motion during wet filament winding of composite cylinders with arbitrary thickness
    International Journal of Solids and Structures, 1992
    Co-Authors: A. Agah-tehrani, H. Teng
    Abstract:

    Abstract A continuum consolidation model is proposed for macroscopic analysis of fiber motion during filament winding of thermoset composite cylinders with arbitrary thickness. The model takes account of the variation of both instantaneous stiffness and permeability of the mixture with fiber compaction. Due to resin filtration, structure of the resulting initial-boundary value problem is similar to that of a moving boundary problem. Based on this analogy, a finite difference scheme is devised for the solution of the problem. For the case of winding onto a rigid mandrel, the results point to the existence of an active and a Passive Zone of consolidation. The results further indicate the possibility that during hoop winding of relatively thick cylinders, the tension can be completely lost in the portion of the Passive Zone away from the mandrel.

  • A Model for Wet Filament Winding of Composite Cylinders with Arbitrary Thickness
    1991
    Co-Authors: A. Agah-tehrani, H. Teng
    Abstract:

    Abstract : A continuum consolidation is purposed for analyzing the filament winding of thermoset composite cylinders with arbitrary thickness. The model takes account of the variation of both the instantaneous stiffness and the permeability of the mixture with fiber compaction. Due to resin filtration, the structure of the resulting initial-boundary value problem is similar to that of a moving boundary problem. Based on this analogy, a finite difference scheme is devised for the solution of the problem. For the case of winding onto a rigid mandrel, the results point to the existence of an active and a Passive Zone of consolidation. The results further indicate the possibility that during hoop winding of relatively thick cylinders, the tension can be completely lost in the portion of the Passive Zone away from the mandrel.

Alex Iván Kociubczyk - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
    Arabian Journal of Chemistry, 2018
    Co-Authors: Claudia Marcela Méndez, Verónica Liliana Scheiber, Roberto S. Rozicki, Alex Iván Kociubczyk, Alicia Esther Ares
    Abstract:

    Abstract In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and 8.9 wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed. Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and Sn-8.9 wt.%Zn) corresponding to longitudinal section present a pseudo Passive Zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed Zones of Sn-8.9 wt.%Zn are the only ones that do not have this pseudo Passive region. In addition, the interdendritic Zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed Zones. In addition, the columnar Zones of Sn-4 wt.%Zn and Sn-8.9 wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed Zone of Sn-1 wt.%Zn alloy is less susceptible to corrosion than the columnar Zone. After adjustment by equivalent circuits it is revealed that the equiaxed Zone of Sn-8.9 wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface.

  • Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
    Elsevier, 2018
    Co-Authors: Claudia Marcela Méndez, Verónica Liliana Scheiber, Roberto S. Rozicki, Alex Iván Kociubczyk, Alicia Esther Ares
    Abstract:

    In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and 8.9 wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed.Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1 wt.%Zn, Sn-4 wt.%Zn and Sn-8.9 wt.%Zn) corresponding to longitudinal section present a pseudo Passive Zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed Zones of Sn-8.9 wt.%Zn are the only ones that do not have this pseudo Passive region. In addition, the interdendritic Zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed Zones. In addition, the columnar Zones of Sn-4 wt.%Zn and Sn-8.9 wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed Zone of Sn-1 wt.%Zn alloy is less susceptible to corrosion than the columnar Zone. After adjustment by equivalent circuits it is revealed that the equiaxed Zone of Sn-8.9 wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface. Keywords: Sn-Zn alloys, Corrosion, EIS, NaCl, Grain structure