scholarly journals Study of Polarization Characteristics of Corrosion Films on Magnesium in Sulfate-Containing Electrolytes

2020 ◽  
Vol 10 (4) ◽  
pp. 1406
Author(s):  
Ainaz K. Abildina ◽  
Akmaral M. Argimbayeva ◽  
Andrey Kurbatov ◽  
Yeldana Bakhytzhan ◽  
Gulmira Rakhymbay ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electric Fields ◽  
Electrochemical Process ◽  
Point Of View ◽  
Particle Movement ◽  
Polarization Characteristics ◽  
Magnesium Surface ◽  
Corrosion Film ◽  
High Electric Fields ◽  
Free Magnesium

In this article, the results of studying the polarization characteristics of magnesium covered with corrosion film in aqueous solutions of MgSO4 and Na2SO4 are presented. The absence of a corrosion-free magnesium surface was shown; in this connection, it was proposed to interpret the larger values of Tafel’s coefficients obtained in the experiment from the point of view of limiting the electrochemical process by charge transfer in the film phase. Charge transfer in corrosion films obeys the regularities of particle movement in high electric fields, and it is not only cationic. According to the impedance measurements, the resistance of the oxide and hydroxide layer of the magnesium-based corrosion film in the studied solutions was calculated. The largest contribution to the restriction of charge transfer in the initial stages of corrosion is made by a dense primary film defining the polarization resistance. Correlation of transfer parameters in high electric fields with thickness and resistance of corrosion film was demonstrated.

Atomic Spectroscopy in the FIM

1986 ◽  
Vol 44 ◽  
pp. 758-761
Author(s):  
J. J. Hren ◽  
S. D. Walck
Keyword(s):  
Electron Microscope ◽  
Electric Fields ◽  
Atom Probe ◽  
Atomic Spectroscopy ◽  
Single Atom ◽  
Statistical Sampling ◽  
Commercial Instrument ◽  
Available Technology ◽  
High Electric Fields ◽  
Field Ion Microscope

The field ion microscope (FIM) has had the ability to routinely image the surface atoms of metals since Mueller perfected it in 1956. Since 1967, the TOF Atom Probe has had single atom sensitivity in conjunction with the FIM. “Why then hasn't the FIM enjoyed the success of the electron microscope?” The answer is closely related to the evolution of FIM/Atom Probe techniques and the available technology. This paper will review this evolution from Mueller's early discoveries, to the development of a viable commercial instrument. It will touch upon some important contributions of individuals and groups, but will not attempt to be all inclusive. Variations in instrumentation that define the class of problems for which the FIM/AP is uniquely suited and those for which it is not will be described. The influence of high electric fields inherent to the technique on the specimens studied will also be discussed. The specimen geometry as it relates to preparation, statistical sampling and compatibility with the TEM will be examined.

scholarly journals Restraining Surface Charge Accumulation and Enhancing Surface Flashover Voltage through Dielectric Coating

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 750
Author(s):  
Jixing Sun ◽  
Sibo Song ◽  
Xiyu Li ◽  
Yunlong Lv ◽  
Jiayi Ren ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electric Field ◽  
Electric Fields ◽  
Transition Process ◽  
Metallic Particle ◽  
Particle Charging ◽  
Insulating Surfaces ◽  
Surface Flashover ◽  
Charging Time ◽  
The Impact

A conductive metallic particle in a gas-insulated metal-enclosed system can charge through conduction or induction and move between electrodes or on insulating surfaces, which may lead to breakdown and flashover. The charge on the metallic particle and the charging time vary depending on the spatial electric field intensity, the particle shape, and the electrode surface coating. The charged metallic particle can move between the electrodes under the influence of the spatial electric field, and it can discharge and become electrically conductive when colliding with the electrodes, thus changing its charge. This process and its factors are mainly affected by the coating condition of the colliding electrode. In addition, the interface characteristics affect the particle when it is near the insulator. The charge transition process also changes due to the electric field strength and the particle charging state. This paper explores the impact of the coating material on particle charging characteristics, movement, and discharge. Particle charging, movement, and charge transfer in DC, AC, and superimposed electric fields are summarized. Furthermore, the effects of conductive particles on discharge characteristics are compared between coated and bare electrodes. The reviewed studies demonstrate that the coating can effectively reduce particle charge and thus the probability of discharge. The presented research results can provide theoretical support and data for studying charge transfer theory and design optimization in a gas-insulated system.

High Field Electron Drift in a-Si:H

1993 ◽  
Vol 297 ◽  
Author(s):  
Qing Gu ◽  
Eric A. Schiff ◽  
Jean Baptiste Chevrier ◽  
Bernard Equer
Keyword(s):  
Electric Fields ◽  
High Field ◽  
Drift Mobility ◽  
Time Range ◽  
Electron Drift ◽  
Parameter Change ◽  
Transient Photocurrent ◽  
Field Mobility ◽  
High Electric Fields ◽  
Electron Drift Mobility

We have measured the electron drift mobility in a-Si:H at high electric fields (E ≤ 3.6 x 105 V%cm). The a-Si:Hpin structure was prepared at Palaiseau, and incorporated a thickp+ layer to retard high field breakdown. The drift mobility was obtained from transient photocurrent measurements from 1 ns - 1 ms following a laser pulse. Mobility increases as large as a factor of 30 were observed; at 77 K the high field mobility de¬pended exponentially upon field (exp(E/Eu), where E u= 1.1 x 105 V%cm). The same field dependence was observed in the time range 10 ns – 1 μs, indicating that the dispersion parameter change with field was negligible. This latter result appears to exclude hopping in the exponential conduction bandtail as the fundamental transport mechanism in a-Si:H above 77 K; alternate models are briefly discussed.

Oscillations and Bistability in the Catalytic Formation of Water on Rhodium in High Electric Fields

2009 ◽  
Vol 113 (39) ◽  
pp. 17045-17058 ◽  
Author(s):  
J.-S. McEwen ◽  
P. Gaspard ◽  
T. Visart de Bocarmé ◽  
N. Kruse
Keyword(s):  
Electric Fields ◽  
High Electric Fields

Impact of high electric fields on the charge recombination process in organic light-emitting diodes

2000 ◽  
Vol 33 (19) ◽  
pp. 2379-2387 ◽  
Author(s):  
Jan Kalinowski ◽  
Massimo Cocchi ◽  
Piergiulio Di Marco ◽  
Waldemar Stampor ◽  
Gabriele Giro ◽  
...  
Keyword(s):  
Electric Fields ◽  
Light Emitting Diodes ◽  
Charge Recombination ◽  
Recombination Process ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
High Electric Fields

The dielectric response of water in high electric fields: equilibrium water thickness and the field distribution

1998 ◽  
Vol 294 (1-3) ◽  
pp. 255-261 ◽  
Author(s):  
Dawn L. Scovell ◽  
Tim D. Pinkerton ◽  
Bruce A. Finlayson ◽  
Eric M. Stuve
Keyword(s):  
Field Distribution ◽  
Electric Fields ◽  
Dielectric Response ◽  
High Electric Fields
Sign in / Sign up

Export Citation Format

Share Document