A Study of Pitting Corrosion of Aluminum Alloy 5182 in a Beverage Solution Environment by the Area Polarization Technique

Abstract

A study has been made on the relation between concentration of dissolved oxygen in a beverage solution in Japanese market and pitting attack of aluminum alloy 5182. The anodic polarization resistance of the alloy was measured by the area polarization technique in a drink solution environment, where dissolved oxygen concentration was continuously changed from 10ppb to 600ppb. It was found that more than 40ppb of 5182 aluminum alloy is subjected to pitting corrosion in the solutions containing more than 40ppb of dissolved oxygen. The value of dissolved oxygen concentration agrees well with the realistic can-rupture condition of beverage solution in a market.