Dear Dr. Harshal Mehta,

the Tafel slope analysis provides a quick estimation of the corrosion rate and the polarization resistance. The corrosion rate is calculated from the estimated corrosion current, icorr, obtained from the intercept of the two linear segment of the Tafel slope.

You can also analyse, in order to have more info, the anodic and cathodic Tafel slopes and calculates, simply using a suitable software, the characteristic corrosion values using the specified density, equivalent weight and surface area.

For more info, please have a look at:

- https://www.ecochemie.nl/download/Applicationnotes/Autolab_Application_Note_COR02.pdf

- https://www.gamry.com/application-notes/corrosion-coatings/basics-of-electrochemical-corrosion-measurements/

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

Best regards, Pierluigi Traverso

What you meaning by polarization value?

drear Harshal Mehta, i think it is the polarization resistance

Sir, Mahmood H. M. you mean to say higher is the value of polarization,

lower is the corrosion rate.

sure sister Harshal Mehta, higher polarization resistance mean lower corrosion rate.

From studies, it has been shown that the higher the value of the polarization resistance, the lower corrosion rate.

But sometimes in my studies I have seen lower value of polarization resistance corresponding to lower corrosion rate in comparison to the other system where the value the corrosion rate is higher and polarization resistance is also high. How can I interpret that result ?Engr. Okiemute Dickson Ofuyekpone

the polarization resistance is the slope of pol curve at open circuit as the curve tends to be linear near Ecorr, which facilitates determination of the slope for more detailes please read;

https://www.sciencedirect.com/topics/chemistry/polarization-resistance

Dear Dr. Harshal Mehta ,

I would like to advise you to read with a little more attention the documents that I had listed in my previous answer; the terms used are very specific and, in a scientific context, it is necessary to express them correctly and to know their meaning well.

Please have a look at:

- https://www.ecochemie.nl/download/Applicationnotes/Autolab_Application_Note_COR02.pdf

- https://www.gamry.com/application-notes/corrosion-coatings/basics-of-electrochemical-corrosion-measurements/

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

My best regards, Pierluigi Traverso.