The localized corrosion resistance of several Al-based metallic glasses, all containing 85-90% Al, transition metals, and rare earth elements, was examined in fully amorphous, partially nanocrystalline, and fully crystalline microstructures to assess the possible detrimental effects of partial and complete devitrification on corrosion. In all of the alloys examined, Al90Fe5Gd5, Al85Fe7Gd8, Al90Co3Ce7, and Al87Ni7Gd6, the pitting potential associated with the formation of micrometer-scale pits in deaerated 0.6 M NaCl remained elevated relative to pure polycrystalline Al in all partially devitrified (amorphous-nanocrystalline) states despite the presence of up to 40 vol % solute-depleted face-centered cubic Al nanocrystals dispersed in the remaining amorphous matrix. In contrast, the pitting potentials of the fully crystallized glasses were similar to that of pure Al. (c) 2007 The Electrochemical Society.