Effect of microstructural defects on passive layer properties of interstitial free (IF) ferritic steels in alkaline environment

• DOI: 10.1016/j.corsci.2021.109271
• Publication Date: 2021-01-20T16:35:34Z
• Authors: A. Yilmaz; K. Traka; S. Pletincx; T. Hauffman; J. Sietsma; Y. Gonzalez-Garcia
• Keywords: EIS; 669; Microstructural defect density; Passivity; Mott-Schottky analysis; XPS; 0202 electrical engineering, electronic engineering, information engineering; passivity; 02 engineering and technology; SKP; Ferritic steel

The role of microstructural defects (dislocation density and grain boundary areas) on the passive film properties formed cold- hot-rolled interstitial free (IF) steels is investigated in 0.1 M NaOH solution. Electron backscattered diffraction (EBSD) shows higher defect cold-rolled samples. Potentiodynamic polarization (PDP) electrochemical impedance spectroscopy (EIS) results exhibit lower barrier films with increase defects. This attributed to donor measured Mott-Schottky analysis relative quantity protective γ-Fe2O3 (composed Fe3O4,γ-Fe2O3 FeO(OH)) density.