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The sealing in alkali earth metal ion solutions was effective to increase the resistance to pitting of the aluminum anodized in a sulfuric acid solution. After sealing, formation of crystalline BaSO4 in the anodic oxide film was confirmed by XRD and EPMA. The formation of sulfate and/or carbonate of Ca(II) and Sr(II) was suggested, though no direct evidence was obtained except for Ca 2p XPS spectrum. The resistance depended on the composition of sealing solution and increased in the order ofdoi:10.3323/jcorr1991.47.729 fatcat:orm3z5bon5czdamng646vtuuxe