Morphological analysis of pits formed on Al 2024-T3 in chloride aqueous solution
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Data
2004-09-15
Autores
Silva, JWJ
Bustamante, A. G.
Codaro, E. N.
Nakazato, R. Z.
Hein, LRO
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
It has been used a new image analysis method, based on segmentation by shape parameters, for pits morphology examination from Al 2024 aluminum-copper alloy in chloride aqueous solution. Corrosion behavior of this alloys in naturally aerated 3.5% NaCl solution has been investigated through open circuit potential measurements. Afterwards, pits have been characterized by image analysis taking density and size measurements right from corroded surfaces. Morphological investigation has been conducted for profiles, cut orthogonally from mean surface planes, and observed through light microscopy. Image analysis data could demonstrate that pits are wider than deep, evoluting for conical, quasi-conical or irregular shapes. Most pits have presented a quasi-conical morphology, but the wider ones have evoluted to an irregular shape influenced by sub-surface microstructure. Image analysis based on shape segmentation could enhance the differences on morphological behavior. (C) 2004 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
image analysis, pitting corrosion, aluminum alloys
Como citar
Applied Surface Science. Amsterdam: Elsevier B.V., v. 236, n. 1-4, p. 356-365, 2004.