We are doing corrosion analysis for various coatings in 3.5% NaCl solution using an Electrochemical workstation CHE 660. The electrode assembly is consists of Ag/AgCl as a reference, Pt wire as counter, and our coatings as a working electrode. After completion of Tafel testing, the software demands various parameters including no of the electron. Other parameters like density, area make sense. However, what is the significance of no of electrons? What value should be used in all of the below scenarios?
a) Pure metallic coating
b) Alloy coating
c) Composite coatings (Mixture of two powders)
d) Multi coatings (different top and intermediate coating)
Any suggestion or reference to suitable literature will be appreciated.
An oxidation-reduction reaction is a reaction that involves an exchange of electrons between reactants.
Here is an example of oxidation half reactions:
Mg (s) → Mg2 + (aq) + 2e−
In this example the number of electrons exchanged is equal to 2
The number of electrons therefore depends on the oxidizing-reducing couple involved
To find out, write the oxidation-reduction equations
Dear Dr. Nisar Ahmed ,
I suggest you to have a look at the following, interesting paper:
-Defining the transfer coefficient in electrochemistry: An assessment (IUPAC Technical Report)
Rolando Guidelli, Richard G. Compton, Juan M. Feliu, Eliezer Gileadi, Jacek Lipkowski, Wolfgang Schmickler and Sergio Trasatti
Journal Pure and Applied Chemistry, vol. 86, no. 2, 2014, pp. 245-258. https://doi.org/10.1515/pac-2014-5026
Available at: https://www.degruyter.com/document/doi/10.1515/pac-2014-5026/html
My best regards, Pierluigi Traverso.
Use the number of electrons of the metal involved in the corrosion activities. That's the substrate.
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