Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
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Ruizhen Xie
Abstract
The EIS behavior, corrosiveness, and seepage structure of sand of varied water content were studied by means of electrochemical impedance spectroscopy under the three-electrode system. The results show that the effect of void geometry on the impedance modulus disappears at the high frequency range. However, the impedance modulus is greatly affected by the pore geometry and the effect is greater for standard sand with increased randomness when the frequency is under 5 Hz. The pore structure of standard sand increases Re by an order of magnitude and the increase is more obvious when water content is low. By contrast, Rt decreases with increasing water content. The corrosiveness of the sand system increases with increasing water content. The electrochemical process of a wet sand system shifts from a kinetic control process to a material transfer control process as frequency changes from a high to a low range. The hydraulic radius, a parameter of the seepage structure, fluctuates between 0.01 and 0.03 mS. The magnitude of W, showing a change in tortuosity T, fluctuates between 10−5 and 10−6.
Kurzfassung
Für den vorliegenden Beitrag wurde das elektrochemische Impedanzverhalten, die Aggressivität bezüglich Korrosion und die Versicherungsstruktur von Sanden mit verschiedenen Wassergehalten untersucht, indem das Verfahren der elektrochemischen Impedanzspektroskopie mit dem Drei-Elektroden-System zum Einsatz. Die Ergebnisse zeigen, dass die Auswirkung der Porengeometrie auf den Impedanzmodul im hochfrequenten Bereich verschwindet. Dem gegenüber wird der Impedanzmodul sehr durch die Porengeometrie beeinflusst, und dieser Effekt ist größer für Standardsande mit einer größeren Zufälligkeit wenn die Frequenz unter 5 Hz beträgt. Die Porenstrukture der Standardsande Re nimmt um eine Größenordnung zu und diese Zunahme ist umso offensichtlicher, wenn der Wassergehalt niedrig ist. Dem gegenüber nimmt Rt mit zunehmendem Wassergehalt ab. Die Aggressivität bezüglich Korrosion des Sandsystems nimmt mit zunehmendem Wassergehalt zu. Der elektrochemische Prozess des nassen Sandsystems verschiebt sich von einem kinetisch kontrollierten Prozess zu einem materialkontrollierten Prozess, wenn sich die Frequenz von einem hohen zu einem niedrigen Bereich verändert. Der hydraulische Radius, ein Parameter für die Versickerungsstruktur, fluktuiert zwischen 0,01 und 0,03 mS. Die Größe von W, das die Veränderung der Tortuosität T anzeigt, fluktuiert zwischen 10−5 und 10−6.
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© 2018, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Compression testing of additively manufactured continuous carbon fiber-reinforced sandwich structures
- Microstructure and mechanical properties of nano-carbon reinforced Cu-based powder metallurgy friction materials produced by hot isostatic pressing
- Thermo-mechanical testing of TiO2 functional coatings using friction stir processing
- Ternary melt blend based on poly (lactic acid)/chitosan and cloisite 30B: A study of microstructural, thermo-mechanical and barrier properties
- Untersuchungen zur verlässlichen Messung der Härte nach dem UCI – Verfahren (Ultrasonic Contact Impedance)
- Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
- Recycling of LM25 aluminum alloy scraps
- Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality
- Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
- Essential Work of Fracture: Bestimmung des gültigen Ligamentbereiches mittels digitaler 3D-Bildkorrelation
- Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites
- Solid particle erosion wear behavior of severe plastically deformed AA7075 alloys
- Performance of coated and uncoated carbide/cermet cutting tools during turning
- Assessment of soft materials for anthropomorphic soft robotic fingertips
- Application of the grey based Taguchi method and Deform-3D for optimizing multiple responses in turning of Inconel 718
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Compression testing of additively manufactured continuous carbon fiber-reinforced sandwich structures
- Microstructure and mechanical properties of nano-carbon reinforced Cu-based powder metallurgy friction materials produced by hot isostatic pressing
- Thermo-mechanical testing of TiO2 functional coatings using friction stir processing
- Ternary melt blend based on poly (lactic acid)/chitosan and cloisite 30B: A study of microstructural, thermo-mechanical and barrier properties
- Untersuchungen zur verlässlichen Messung der Härte nach dem UCI – Verfahren (Ultrasonic Contact Impedance)
- Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system
- Recycling of LM25 aluminum alloy scraps
- Mechanical fracture characterization of adhesive interfaces: Introducing a new concept for evaluating adhesive quality
- Effect of welding processes on mechanical and microstructural properties of S275 structural steel joints
- Essential Work of Fracture: Bestimmung des gültigen Ligamentbereiches mittels digitaler 3D-Bildkorrelation
- Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites
- Solid particle erosion wear behavior of severe plastically deformed AA7075 alloys
- Performance of coated and uncoated carbide/cermet cutting tools during turning
- Assessment of soft materials for anthropomorphic soft robotic fingertips
- Application of the grey based Taguchi method and Deform-3D for optimizing multiple responses in turning of Inconel 718