Abstract
This paper examines the current status of stress-corrosion cracking (SCC) in the manufacturing and use of 5182 aluminum beverage can ends. Stress-corrosion cracking failures of the aluminum easy-open ends is an infrequent and undesirable failure encountered with filled beverage containers. Although SCC is responsible for a relatively small percentage of aluminum beverage can failures each year, it is still a concern to can manufacturers, fillers, and distributors. A change in SCC failure mode from transgranular to intergranular SCC has been observed in 5182 aluminum beverage can ends. This has been observed since the introduction of new end designs with higher stress promoting SCC fractures. The transition of cracking mode is attributed to both anodic dissolution and hydrogen embrittlement. In this paper, these mechanisms are discussed including fractography evidence, identifying the probable causes and solutions. Some suggestions are made to mitigate the tendency for SCC at the fillers.
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