Why anodic polarization occurs when ηA > 0 and cathodic polarization takes place when ηC < 0?
You can find the question and the answer in this book
https://books.google.com/books/about/Principles_of_Corrosion_Engineering_and.html?id=10U1CRPV_BUC
Dear Osamah
The relationship between activation polarization(h) and the rate of reaction(i) is given by
ηa = ba Log (ia/io)
ηc = bc Log (ic/io)
where
ηa=anodic activation polarization
ηc=cathodic activation polarization
ba=anodic Tafel constant
bc=cathodic Tafel constant
ia = anodic current density
ic = cathodic current density
io = exchange current density
So the answer to your question, the anodic polarization occurs when ηA > 0 because ia is positive and the cathodic polarization occurs when ηc < 0 because ic is negative. Please refer to the following link on activation polarization:
(https://faculty.kfupm.edu.sa/ME/hussaini/Corrosion%20Engineering/02.07.01.htm)
you can refer to the below link:
https://www.youtube.com/watch?v=g9y-WXTKh5Q&list=PLyAZSyX8Qy5B5UBpWgGjS8AABYW78gqz4&index=13
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