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Cause and Preventive Measures of Bright-Craterlet on Hydrophile Aluminum Foil

The morphology of bright-craterlet during hydrophile aluminum foil rolling was analyzed by SEM and metalloscope. Two kinds of bright-craterlet were found, one is sliding-line type bright-craterlet and another is crater type bright-craterlet. The results show that sliding-line type bright-craterlet is caused by the poor degasification in the cast-rolling process. On the other hand, the crater type bright-craterlet is caused by the porosity. The main reason for these defects is the low cast-rolling rate. The preventive measures were also examined to improve qualities of hydrophile aluminum foils further.