Abstract
Abstract An investigation of the corrosion behavior of coil-coated AA5182 (UNS A95182) can ends revealed directional underfilm corrosion during immersion in 0.6 M sodium chloride (NaCl) solution. Corrosion occurred preferentially within ∼ 10 mm wide bands that were dull in appearance. Microscopic examination revealed that these dull bands were a result of small dimples ≈ 10 μm deep and 100 μm wide. Regions that had a higher dimple density had a lower pitting potential than regions with fewer dimples. Subsequent investigation determined that dimples were introduced into the coil-coated sheet by feed rollers during can end manufacturing. Oxide damage and second-phase precipitation at dislocations resulting from micron-scale surface deformation were proposed as the mechanisms of increased corrosion susceptibility. The present study showed the importance of manufacturing protocol in the determination of corrosion performance of organic coatings on alloy substrates. More specifically, the importance of the sub...
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