Dear Dr. Esra N. İçaçan ,

I suggest you to have a look at the following, interesting documents:

-Application Note CORR-1 – Basics of Corrosion Measurements by Princeton Applied Research

Available at: https://www.ameteksi.com/-/media/ameteksi/download_links/documentations/library/princetonappliedresearch/application_note_corr-1.pdf?revision=72ff248d-93aa-470e-a16b-ea23a8f8148a

-Application Note - Getting Started with Electrochemical Corrosion Measurement by Gamry Instruments

Available at: https://www.gamry.com/assets/Application-Notes/Getting-Started-with-Electrochemical-Corrosion-Measurement.pdf

-Tafel Plot and Evans Diagram by Palmsens

Available at: https://www.palmsens.com/knowledgebase-article/tafel-plot-and-evans-diagram/

-Electrochemical Corrosion Studies of Various Metals by Metrohm Autolab

Available at: https://www.google.it/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiLrqf4v9n0AhWRMewKHQFXAqAQFnoECCEQAQ&url=https%3A%2F%2Fpartners.metrohm.com%2FGetDocumentPublic%3Faction%3Dget_dms_document%26docid%3D3347651&usg=AOvVaw3DOgpH4l6qq3FFmrQ0TAE2

Enjoy reading and my best regards, Pierluigi Traverso.

Dear Esra N. İçaçan,

Thank you for your interesting question. As I not full expert in this field, I will borrow for you the following article:

1- [Stalin, B., Sudha, G. T., Kailasanathan, C., & Ravichandran, M. (2020). Effect of MoO3 ceramic oxide reinforcement particulates on the microstructure and corrosion behaviour of Al alloy composites processed by P/M route. Materials Today Communications, 25, 101655]

2- Available at: https://www.google.it/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiLrqf4v9n0AhWRMewKHQFXAqAQFnoECCEQAQ&url=https%3A%2F%2Fpartners.metrohm.com%2FGetDocumentPublic%3Faction%3Dget_dms_document%26docid%3D3347651&usg=AOvVaw3DOgpH4l6qq3FFmrQ0TAE2.

Enjoy reading,

IDIR.

Hi Esra,

Your Ecorrs can easily be found from your Tafel plots. These are the 'pointy' bits on your graphs. So they would be -528 mV, -486 mV, -465 mV and so forth.

To work out your Icorrs, simply extrapolate the linear portions of the anodic and cathodic reactions to the corrosion potential (Ecorr). If the anodic and cathodic Tafel lines have an equal gradient, then the Icorr is the current at the intersection of these two lines. Hope that helps!

(If your gradients are unequal then you need to calculate your Icorrs).

Hi Nadya Rauff-Nisthar

I found Ecorr value but I am not sure how should ı find ıcorr. I think something is going wrong my curve.

Thank you for all answers Pierluigi Traverso Idir Abdelhek

Hi Esra N. İçaçan

Sorry for my late reply. Have a look at the attached example below for extrapolating to find your icorr. If the gradients are not equal, you may use the following formula to find your icorrs:

Icorr = (ßAßC)/2.3(ßA+ßC) . 1/Rp

where ßA and ßC are the Tafel slopes of the anodic and cathodic reactions respectively

Rp = polarisation resistance which is equivalent to the gradient of the line approx. 10 to 20 mV either side of Ecorr on a standard potential vs current plot.

Hope that helps!

Thanks a lot Nadya Rauff-Nisthar I found values.:)

Awesome!