Dear Dr. Sana Mirza ,

I suggest you take a look at similar questions already present on RG:

-Significance of Rs, Rp, Rct parameters on corrosion?

Available at: https://www.researchgate.net/post/Significance-of-Rs-Rp -Rct-parameters-on-corrosion

and

- I am running EIS and find my solution resistance (Rs) becoming big. Can anyone explain this phenomenon. I am using PBS as buffer. Thank you

Available at: https://www.researchgate.net/post/I_am_running_EIS_and_find_my_solution_resistance_Rs_becoming_big_Can_anyone_explain_this_phenomenon_I_am_using_PBS_as_buffer_Thank_you

and evaluate the correct answers provided by colleagues.

My best regards, Pierluigi Traverso.

Dear Pierluigi Traverso

Thank you so much for your feedback. I have another related question about the shape of the polarization curve. I run the potentiodynamic polarization scan on 316 stainless steel samples in two different mediums i.e. A & B. In medium A: the polarization curve showed active to passive transition region but medium B showed absence of active to the passive transition region. What factors affect the active-passive transition region of stainless steel? Is it something related to solution resistance? Thank you

Dear Dr. Sana Mirza ,

a variation of the polarization curve showed in the active to passive transition region may be due to chemical / physical factors of the different solutions.

I suggest you to have a look at the interesting Application Note CORR-1 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

My best regards, Pierluigi Traverso.