scholarly journals Using Moving Electrode Impedance Spectroscopy to Monitor Particle Sedimentation

2020 ◽  
pp. 1-1 ◽  
Author(s):  
Nikolaus Doppelhammer ◽  
Nick Pellens ◽  
Christine E.A. Kirschhock ◽  
Bernhard Jakoby ◽  
Erwin K. Reichel
Keyword(s):  
Impedance Spectroscopy ◽  
Electrode Impedance ◽  
Particle Sedimentation ◽  
Electrode Impedance Spectroscopy

Monitoring Particle Sedimentation in Conductive Suspensions with Moving Electrode Impedance Spectroscopy

2019 ◽  
Author(s):  
Nikolaus Doppelhammer ◽  
Nick Pellens ◽  
Erwin K. Reichel ◽  
Christine E. A. Kirschhock ◽  
Bernhard Jakoby
Keyword(s):  
Impedance Spectroscopy ◽  
Electrode Impedance ◽  
Particle Sedimentation ◽  
Electrode Impedance Spectroscopy

scholarly journals Moving Electrode Impedance Spectroscopy for Accurate Conductivity Measurements of Corrosive Ionic Media

ACS Sensors ◽  
2020 ◽  
Vol 5 (11) ◽  
pp. 3392-3397
Author(s):  
Nikolaus Doppelhammer ◽  
Nick Pellens ◽  
Johan Martens ◽  
Christine E. A. Kirschhock ◽  
Bernhard Jakoby ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Electrode Impedance ◽  
Conductivity Measurements ◽  
Ionic Media ◽  
Electrode Impedance Spectroscopy

Analysis on corrosion of aluminum-based micro-arc oxidation coating

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yuanhang Yang ◽  
Gang Feng ◽  
Yanhong Gu ◽  
Jie Zhao ◽  
Jian Liang
Keyword(s):  
Corrosion Resistance ◽  
Impedance Spectroscopy ◽  
Sea Water ◽  
Open Circuit ◽  
Al Alloy ◽  
Corrosion Mechanism ◽  
Electrode Impedance ◽  
Content Type ◽  
Micro Arc Oxidation ◽  
Electrode Impedance Spectroscopy

Purpose Aluminum alloy is susceptible to chloride ion attack in sea water, resulting in pitting damage and hence serious security risks for the related applications. To improve the corrosion resistance of Al alloy, micro-arc oxidation (MAO) technology has been developed to produce a protective dense oxide layer on top of Al alloy. However, the mechanism of MAO-induced corrosion resistance is still not fully understood, particularly on local corrosion issue. This paper aims to focus on comprehensively studying the corrosion-resistance mechanism by a series of technologies. Design/methodology/approach The corrosion behavior of samples was studied by open circuit potential (OCP), potentiodynamic polarization (PDP), electrode impedance spectroscopy (EIS) and localized electrode impedance spectroscopy (LEIS) tests in NaCl solution. Findings The MAO-coated Al alloy shows a more positive corrosion potential and a higher corrosion current density compared to the untreated counterpart, indicating a significantly enhanced corrosion-resistance. The study of surface morphology and structure also suggest significantly enhanced corrosion-resistance due to the MAO treatment. Originality/value Based on the results, a new corrosion model was proposed to describe the influence of MAO treatment on the corrosion process and corrosion mechanism of Al alloy, providing insights on the design of the corrosion-resistance coating for metallic alloys in marine applications.

scholarly journals Composition and

2018 ◽  
Vol 20 (2) ◽  
pp. 145 ◽  
Author(s):  
M. Ved’ ◽  
N. Sakhnenko ◽  
I. Yermolenko ◽  
G. Yar-Mukhamedova ◽  
R. Atchibayev
Keyword(s):  
Current Density ◽  
Ternary Alloys ◽  
Electrode Impedance ◽  
Refractory Component ◽  
X Ray ◽  
Electrode Impedance Spectroscopy ◽  
Competitive Reduction ◽  
Off Time ◽  
Polarization Resistance Method ◽  
Amorphous Part

Principles of three component Iron-Cobalt-Tungsten alloys electrodeposition from complex Fe (III) based citrate electrolytes are discussed. It is shown, that deposition of ternary alloys proceeds through competitive reduction of cobalt and tungsten with iron. With increasing ligand concentration coatings are enriched with a refractory component; however, increasing current density favors a reverse trend. The effect of both current density and pulse on/off time on the quality, content of alloying metals and surface topography of electrolytic coatings were determined. The application of pulsed electrolysis provides increasing tungsten content up to 13 at.%, at current efficiency of 70–75%. Globular relief of Fe-Co-W coatings is caused by refractory metals incorporation, and crystalline and amorphous parts of structure are visualized by X-ray spectroscopy, including inter-metallic phases Co7W6, Fe7W6 along with α-Fe and Fe3C. The crystallite size of the amorphous part is near 7–8 nm. Corrosion resistance of the coatings is 1.3–2.0 orders of magnitude higher than the substrate parameters as follows from data of polarization resistance method and electrode impedance spectroscopy.

Impedance spectroscopy of (TlGaSe2)1−x(TlInSe2)x solid solutions in radio frequency range

2020 ◽  
Vol 34 (11) ◽  
pp. 2050113
Author(s):  
R. M. Sardarli ◽  
F. T. Salmanov ◽  
N. A. Alieva ◽  
R. M. Abbasli
Keyword(s):  
Charge Transfer ◽  
Impedance Spectroscopy ◽  
Electric Fields ◽  
Solid Solutions ◽  
Effective Medium Theory ◽  
Low Frequency ◽  
Localized States ◽  
Electrode Impedance ◽  
Frequency Range ◽  
Low Frequencies

The processes of charge transport on alternating current in [Formula: see text] solid solutions have been studied. It has been established that in weak alternating electric fields, there is a hopping mechanism of charge transfer over localized states in the vicinity of the Fermi level. A quantitative assessment of parameters was made in the framework of the effective medium theory and the Mott approximation. The use of impedance spectroscopy methods in [Formula: see text] solid solutions in the frequency range of 25–106 Hz, at temperatures of 180, 240 and 300 K charge transfer processes has been investigated. It was found that at 300 K in the low-frequency region, there are additional contributions to the conductivity, which, apparently, is associated with diffuse ion transfer near the boundary of the solid electrolyte and the electrode. Impedance locus curves, at low frequencies and at a temperature of 300 K, are characteristic of Warburg diffuse impedance.

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