An assessment of pitting corrosion in anodized aluminum alloys: It might not be what it seems

João victor De sousa araujo, Mariana xavier Milagre, Xiaorong Zhou, Isolda Costa

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Abstract

In this study, special attention was given to the characterization of pits on the anodized aluminum alloy (Al–Zn–Mg–Cu) with an anodic aluminum oxide formed in tartaric sulfuric acid. Anodic polarization in 0.1 mol L−1 NaCl solution was used to initiate pitting corrosion in the anodized alloy. Pit characteristics, such as morphology and depth, were evaluated by using optical microscopy and optical profilometry, and scanning electron microscopy. The methodology adopted in this study revealed severe under-film pitting due to highly occluded conditions and showed that the extent of the under-film pitting is significantly greater than the size of pit mouth observed from the surface.

Original languageEnglish
JournalMaterials and Corrosion
Early online date3 Jan 2024
DOIs
Publication statusE-pub ahead of print - 3 Jan 2024

Keywords

  • anodic polarization
  • image analysis
  • pit morphology
  • optical profilometer (OP)
  • SEM (BSE‐SE)

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