Electrochemical properties of aluminus can stocks in lower Cl- ion beverages.

Electrochemical polarization measurements have been carried out to establish electrochemical evaluation of corrosion resistance of aluminum alloys for can stocks in lower Cl- ion beverages. While no pitting corrosion was obtained in deaerated beverage, corrosion rate increased and pitting corrosion occurred in aerated one. Anodic polarization characteristics depended greatly on temperature and potential scanning rate. When greater difference between Epit, (pitting potential) and Erep (repassivation potential) was obtained, Erep, not Epit could be the characteristic potential of pitting corrosion. Corrosion resistance was well understood in terms of polarization characteristics and, especially, pitting possibility could be estimated in the relation between Ecorr and Erep.