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

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

Yilmaz, A. (TU Delft Team Yaiza Gonzalez Garcia; Material Innovation Institute (M2i); Netherlands Organisation for Scientific Research (NWO))
Traka, K. (TU Delft Team Jilt Sietsma; Material Innovation Institute (M2i); Max-Planck-Institut für Eisenforschung)
Pletincx, S. (Vrije Universiteit Brussel)
Hauffman, T. (Vrije Universiteit Brussel)
Sietsma, J. (TU Delft Materials Science and Engineering)
Gonzalez Garcia, Y. (TU Delft Team Yaiza Gonzalez Garcia)

Materials Science and Engineering

2021

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

EIS
Ferritic steel
Microstructural defect density
Mott-Schottky analysis
Passivity
SKP
XPS

http://resolver.tudelft.nl/uuid:395aa93e-82a4-4a59-9347-96f23fbcc3c5

https://doi.org/10.1016/j.corsci.2021.109271

0010-938X

Corrosion Science: the journal on environmental degradation of materials and its control, 182

Institutional Repository

journal article

© 2021 A. Yilmaz, K. Traka, S. Pletincx, T. Hauffman, J. Sietsma, Y. Gonzalez Garcia