Assessment of pitting corrosion in anodized 2xxx aluminum alloys
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2023
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EUROPEAN CORROSION CONGRESS
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This work focus on the characterization of pitting corrosion initiated in 2xxx Al alloys
anodized in Tartaric Sulphuric Acid (TSA), specifically the 2024-T3 alloy substrates,
and the 2198, in the T8 and T851 tempers. The results were compared to that of
anodized pure Al (99.99 wt.%). The pitting corrosion resistance of the anodized
samples was tested by potentiodynamic polarization in 0.1 mol L-1 NaCl solution. The
tested surfaces were then characterized by optical microscopy, optical profilometry,
scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS),
and image analysis by ImageJ. The polarized samples presented pits of different
sizes. Some pits presented diameters of several hundred microns, with the anodic
films remaining as pit covers. The pits in all anodized samples showed similar
characteristics, such as, a continuous pit cover with a central hole or a pit cover
detached from the substrate in some small areas. The central hole serves as a
diffusion channel for dissolved species within the pits. Detachment of the pit cover
occurs due to accumulation of corrosion products within the pits leading to swelling of
the anodic film and its detachment from the substrate. The results showed that pit
size and depth analysis measured by optical profilometry can be misleading. Depth
assessment should be carried out after removal of the anodic layer followed by crosssection of the anodized sample. The pits developed under highly occluded
conditions. It was also observed that in the anodized alloys, as opposed to pure Al,
pits are related to the defects in the anodic films due to dissolution of micrometric
intermetallic particles during the anodizing process. Pitting attack propagation
occurred according to the microstructure characteristics of the tested material.
Como referenciar
ARAUJO, JOAO V. de S.; CHEN, JINGHUI; ZHOU, XIAORONG; COSTA, ISOLDA. Assessment of pitting corrosion in anodized 2xxx aluminum alloys. In: EUROPEAN CORROSION CONGRESS, August 27-31, 2023, Belgium, Brussels. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47995. Acesso em: 24 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.