Why we get the increasing peaks of oxide layers in muttiple CV scanning of irron ? what is half reduction?

12 December 2018 0 5K Report

whie working on CV on iron we get peaks in which two peaks (one oxidizing-anodic and one reducing-cathodic ) peak which continues to grow on while we increase the number of scanning. why is it so? whats the reason behind this? i am referring to peak 3 and 4 in attached picture.

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