Why the current starts to recede as soon as the critical current density (icritical) is reached as observed in a S-shaped anodic polarization diagram for active–passive metals?
Pierluigi Traverso
Dear Dr. Osamah Ihsan Ali,
I suggest you to have a look at the Chapter "Polarization Curves of Thick and Thin Passivation Films" present in following, interesting note:
https://www.palmsenscorrosion.com/knowledgebase/polarization-curves/
Best regards, Pierluigi Traverso
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Mahmood H. M.
Dear Osamah Ihsan Ali ;
The critical current density is the maximum anodic current required for the anodized coating to start forming, therefore it indicates corrosion resistance of the passive layer and charging transfer within the polarization process.
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