I agree with what has been correctly indicated by Dr. Mohammed Hussein j. H. Al'Atia .
If you want to learn more, I suggest you take a look at the following Application Note: "Getting Started with Electrochemical Corrosion Measurement" by Gamry Instruments, available at: https://www.gamry.com/assets/Application-Notes/Getting-Started-with-Electrochemical-Corrosion-Measurement.pdf
Good work and my best regards, Pierluigi Traverso (CNR-IAS-Genoa).