Characterization of Corrosion under Marine Coatings by Electrochemical Noise Methods.

1994 ◽  
Author(s):  
Gordon Bierwagen ◽  
Douglas J. Mills ◽  
D. Tallman ◽  
B. Skerry
Keyword(s):  
Electrochemical Noise ◽  
Marine Coatings

Gibbs fluctuation theory in the context of electrochemical equilibrium noise

2010 ◽  
Vol 83 (2) ◽  
pp. 253-257 ◽  
Author(s):  
Boris M. Grafov
Keyword(s):  
Electrochemical Noise ◽  
Thermal Fluctuations ◽  
Higher Order ◽  
Fluctuation Theory ◽  
Pair Correlations ◽  
Ergodic Hypothesis ◽  
Electrode Processes ◽  
Electrochemical Charge Transfer ◽  
Electrochemical Devices

The electrochemical noise verification of the Gibbs fluctuation theory shows that the Gibbs ergodic idea works perfectly with respect to the pair correlations of the electrode charge thermal fluctuations. At the same time, the Gibbs formulae for the triple- and higher-order correlations of the electrode charge thermal fluctuations are outside of the ergodic hypothesis. This failure of the Gibbs ergodic idea suggests that the noise version of the electrochemical charge-transfer theory should be developed. In the context of nano-electrochemistry, the second- and higher-order correlations of the electrochemical noise processes may be considered as the quantities suitable for the nano-electrochemical characterization of both the electrode processes and electrochemical devices.

Electrochemical Characterization of the Structural Metals Immersed in Natural Seawater: In Situ Measures

2013 ◽  
Vol 755 ◽  
pp. 119-124 ◽  
Author(s):  
Ricardo Galván-Martínez ◽  
David Cabrera de la Cruz ◽  
Gonzalo Galicia-Aguilar ◽  
Ricardo Orozco-Cruz ◽  
Antonio Contreras-Cuevas
Keyword(s):  
Electrochemical Noise ◽  
Reference Electrode ◽  
Electrochemical Corrosion ◽  
Electrochemical Technique ◽  
Natural Seawater ◽  
Localization Index ◽  
Noise Measurements ◽  
Structural Metals

This work presents the electrochemical corrosion results of the structural metals, aluminium (Al), brass and copper (Cu), immersed in coastal waters of Veracruz Port in Mexico at room temperature, atmospheric pressure and eight weeks of the exposition time. The electrochemical technique used was electrochemical noise (EN). A typical three-electrode electrochemical cell was used. Where the reference electrode was the silver/seawater (Ag/SW) and two nominally identical metallic samples were used as working electrodes (WE1 and WE2). The metallic samples of Al, brass and Cu were used as working electrode. The potential and current fluctuations were measured simultaneously between the two working electrodes (current measured) and the Ag/SW electrode (potential measured). The electrochemical noise measurements (ENM) were analysed by three different methods: Potential and current versus time (transients), Localization Index (LI) and Electrochemical Noise Resistance (Rn). The results shown a good correlation between the superficial analysis and the results obtained by the ENM. In addition, Cu presents the highest corrosion rate and, a corrosion attack was obtained by localization index; this behaviour was confirmed by superficial analysis.

Novel time–frequency characterization of electrochemical noise data in corrosion studies using Hilbert spectra

2013 ◽  
Vol 66 ◽  
pp. 97-110 ◽  
Author(s):  
A.M. Homborg ◽  
E.P.M. van Westing ◽  
T. Tinga ◽  
X. Zhang ◽  
P.J. Oonincx ◽  
...  
Keyword(s):  
Electrochemical Noise ◽  
Time Frequency ◽  
Corrosion Studies ◽  
Noise Data
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