Thanks for this expeditious reply. It is a bit more clearer now. But I still have one more question.
Now related to Tafel extrapolation method (TEM).
According to the literature OCP is the same as corrosion potential (Ecorr), is that right? Well, why then, when I record the polarization curves (cathodic and anodic) with TEM, tangents on the curves cross each other at the Ecorr which is then higher then the previously recorded OCP? I really have some issues figuring these 2 terms and what do they mean. Please help me...