Abstract
The electrochemical behaviour and corrosion of a commercial Egyptian 18-8 austenitic stainless steel was investigated in sulphuric acid and in sodium sulphate solutions using the potentiodynamic technique. In acid solution, the anodic polarization scans are characterized by the appearance of active, passive and transpassive transitions before oxygen evolution. The current densities corresponding to these three regions are increased by increasing either the acid concentration or the voltage scanning rate. The passive electrode does not regain its activity when subjected to cathodic treatment. Sensitization of the electrode enhances its susceptibility to intergranular corrosion. In sodium sulphate solution, the polarization scans are characterized by the disappearance of the active region. On sensitization, a second transpassive region appears before oxygen evolution.
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