Microstructure-Corrosion Property Correlation
Elucidating the influence of microstructure on the active corrosion behavior of Pure Iron
S. Kar (TU Delft - Mechanical Engineering)
Yaiza Gonzalez-Garcia – Mentor (TU Delft - (OLD) MSE-6)
A Yilmaz – Mentor (TU Delft - (OLD) MSE-6)
Jilt Sietsma – Graduation committee member (TU Delft - Materials Science and Engineering)
P. Taheri – Graduation committee member (TU Delft - (OLD) MSE-6)
J.G. Buijnsters – Graduation committee member (TU Delft - Micro and Nano Engineering)
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Abstract
Microstructure-corrosion property correlation is an open question in the field of materials science. The microstructure of metals and alloys consists of several features with different individual corrosion response. The corrosion behavior of the macroscopic system is an outcome of the complex interaction of the components of microstructure. Hence, a definitive understanding of the corrosion response of the microstructural features is needed for improving the material durability and design.In the present work, the effect of grain size on the active corrosion behavior of pure iron is investigated. Samples with different grain sizes are obtained by annealing heat-treatment. The microstructure of samples is characterized by optical microscopy, electron backscatter diffraction and X-ray diffraction. Electrochemical characterization using potentiodynamic polarization and electrochemical impedance spectroscopy are performed on the samples in deaerated 0.1 M and 0.01 M H2SO4 solutions. The surface topography of the corroded sample surface is characterized by atomic force microscopy. Following the experiments, a numerical corrosion model is attempted to replicate the observations. The results reveal an aggregate effect of grain size and crystallographic orientation of grains on the corrosion behavior of the samples.