PHYSICOCHEMICAL CHARACTERIZATION OF CORROSION LAYERS FORMED ON IRON IN A SODIUM CARBONATE-BICARBONATE CONTAINING ENVIRONMENT

Corrosion layers developed on iron in a carbonate-bicarbonate environm ent in the active-passive potential range have been studied, in relati on with Stress Corrosion Cracking (SCC) phenomena, by various physico- chemical techniques: Electrochemical Impedance Spectroscopy (EIS), Inf rared Spectrometry (IRS), Scanning Electron Microscopy (SEM) and Energ y Dispersive Spectrometry (EDS). The chemical and electrical natures o f the corrosion deposits, as well as surface morphologies, have been i nvestigated. The influences of both formation temperature and time hav e been taken into account.