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The anodizing behaviour of constituent particles (Al–Fe–Mn–Cu) and dispersoids (Al–Cu–Mn–Li and β′(Al 3 Zr)) in AA2099-T8 has been investigated. Low-copper-containing Al–Fe–Mn–Cu particles anodized more slowly than the alloy matrix, forming a highly porous anodic oxide film. Medium- and high-copper-containing Al–Fe–Mn–Cu particles were rapidly dissolved, resulting in defects in the anodic...
Several model second phase particles and a practical alloy (AA7075-T6) have been anodized in chromic and sulphuric acid to disclose the relation between particle composition, electrolyte nature and oxidation behaviour. Generally, magnesium-containing second phases are readily oxidized, because the presence of sufficient magnesium hinders the formation of a stable oxide, while copper- and iron-containing...
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