Electrochemical Impedance Method to Measure the Potential of the Outer Helmholtz Plane

2014 ◽  
Vol 161 (6) ◽  
pp. H379-H383 ◽  
Author(s):  
Kwang-Mo Nam ◽  
Byoung-Yong Chang
Keyword(s):  
Electrochemical Impedance ◽  
Impedance Method ◽  
Outer Helmholtz Plane

Corrosion Behavior of 6000 Series Aluminum Alloys Produced by Conventional and Powder Extruded Process through Electrochemical Impedance Method

2010 ◽  
Vol 654-656 ◽  
pp. 1964-1967
Author(s):  
Satoshi Sunada ◽  
Norio Nunomura ◽  
Kazuhiko Majima
Keyword(s):  
Aluminum Alloys ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
The Other ◽  
Impedance Method ◽  
Ingot Metallurgy ◽  
Transfer Resistance ◽  
Maximum Charge ◽  
Cathodic Region

In this study, the electrochemical measurements such as the potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS) tests were carried out in order to clarify the corrosion behavior of the aluminum alloys fabricated by powder extruded (P/E) process compared with those by ingot metallurgy (I/M) process, using 6000 system aluminum alloys. Two kinds of aluminum specimens; one is fabricated by the conventional I/M specimen and the other is fabricated by the P/E process, were used for the electrochemical experiment in the sulfuric acid solution with 0.5 kmol/m3 concentration. Both of I/M and P/E specimens showed the linear relationship between the electrochemical potential (E) and the common logarithm of current density (icorr) in the cathodic region where Tafel law was recognized irrespective of stirring of the test solution though the icorr was slightly increased by stirring for both specimens. On the other hand, in the anodic region, both of the two specimens indicated the almost the same icorr irrespective of stirring. These experimental results interpret that the corrosion is controlled by the chemical reaction. The EIS test indicated that the maximum charge transfer resistance (Rct) was observed at -0.55 V which is 0.11 V higher potential than the corrosion potential (Ecorr) for both of the two specimens.

Tracing hydration feature of aluminophosphate cementitious materials by means of electrochemical impedance method

2016 ◽  
Vol 113 ◽  
pp. 997-1006 ◽  
Author(s):  
Biqin Dong ◽  
Jianchao Zhang ◽  
Yuqing Liu ◽  
Guohao Fang ◽  
Zhu Ding ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Cementitious Materials ◽  
Impedance Method

scholarly journals The effects of time-variance on impedance measurements: examples of a corroding electrode and a battery cell

2020 ◽  
Vol 10 (2) ◽  
pp. 127-140 ◽  
Author(s):  
Nicolas Murer ◽  
Jean-Paul Diard ◽  
Bogdan Petrescu
Keyword(s):  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Steel Sample ◽  
Impedance Method ◽  
Battery Cell ◽  
Low Frequencies ◽  
Impedance Measurements ◽  
Time Variance ◽  
Eis Measurements ◽  
Resistance Decrease

When performing electrochemical impedance spectroscopy (EIS) measurements on a system, we must make sure it fulfills certain conditions. One of them is that it should be stationary that is to say, steady-state and time-invariant. Commonly studied systems are time-variant, for example a corroding electrode or a battery under operation. A corroding electrode sees its polarization resistance decrease with time. A passivating electrode sees its polarization resistance increase with time. These phenomena cause a deformation of the Nyquist impedance at low frequencies. This result was first simulated and validated by experimental measurements on a corroding steel sample undergoing uniform cor­rosion. The effect of performing impedance measurements on a discharging battery was also shown. Several methods are available to check and correct time-variance. The non-stationary distortion (NSD) indicator is used to separate valid and invalid data samples and the so called “4D impedance” method can easily produce instantaneous impedance data.

Novel fast non-linear electrochemical impedance method for corrosion investigations

Measurement ◽  
2020 ◽  
pp. 108667
Author(s):  
P. Slepski ◽  
M. Szocinski ◽  
G. Lentka ◽  
K. Darowicki
Keyword(s):  
Electrochemical Impedance ◽  
Impedance Method ◽  
Non Linear

Photocatalytically renewable peptide-based electrochemical impedance method for sensing lipopolysaccharide

2020 ◽  
Vol 187 (6) ◽  
Author(s):  
Limin Yang ◽  
Yukun Gao ◽  
Kai Fang ◽  
Hui Sun ◽  
Jingtao Sun ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Impedance Method
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