The effect of the change in the microscopic structures of the iron on corrosion resistance and passivated properties

Authors

  • Lv Jinlong,

    1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, China
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  • Hongyun Luo

    Corresponding author
    1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, China
    • Correspondence to: Hongyun Luo, School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Xueyuan Road 37, Beijing, China, 100191.

      E-mail: Luo7128@163.com

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Abstract

The passive film of iron showed n-type semiconductor characteristic in borate buffer solution, and its donor concentration increased slightly after tensile strain in the present study. However, comparing with solution-annealed sample, the anodic passive film formed on tensile-strained one was highly protective. The more dislocations on tensile-strained sample promoted the diffusion of iron and oxygen vacancy. Moreover, more donor density (mainly oxygen vacancies) promoted the diffusion of oxygen. They all facilitated tensile-strained sample to form Fe2O3 and thicker passive film on the surface. More Fe2O3 and thicker passive film on the surface of tensile-strained iron could improve corrosion resistance. Copyright © 2014 John Wiley & Sons, Ltd.

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