Corrosion behavior of pure Al under Fe rust deposition: Decrease in the corrosion resistance of Al caused by γ-FeOOH

This study investigates the effect of γ-FeOOH on the corrosion behavior of pure Al. Polarization measurements in 0.5 wt% NaCl revealed that when the Al surface was entirely covered with γ-FeOOH, the corrosion resistance decreased. Grow discharge optical emission spectrometry and scanning transmissio...

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Bibliographic Details
Published in:Corrosion science 2023-09, Vol.222, p.111379, Article 111379
Main Authors: Kadowaki, Mariko, Katayama, Hideki
Format: Article
Language:English
Subjects:
Aluminium (A)
Iron (A)
Passivity (C)
Polarization (B)
Rust (C)
STEM (B)
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Summary:This study investigates the effect of γ-FeOOH on the corrosion behavior of pure Al. Polarization measurements in 0.5 wt% NaCl revealed that when the Al surface was entirely covered with γ-FeOOH, the corrosion resistance decreased. Grow discharge optical emission spectrometry and scanning transmission electron microscopy observations showed that Fe was incorporated into the surface film of Al, rendering the film inhomogeneous and decreasing in its protective ability. In addition, because γ-FeOOH readily causes the reduction reaction (cathodic reaction), the anodic reaction of Al was accelerated to balance with this increased cathodic reaction. •Corrosion behavior of pure Al was analyzed under γ-FeOOH deposition.•Low protective surface film, including Fe, was formed on Al.•The reduction reaction of γ-FeOOH accelerated the anodic reaction of Al.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2023.111379