アルミ缶の特性ならびに腐食問題

抄録

Aluminum cans have been widely used for content of beer and soft drink. They have many advantages to other cotainers such as steel cans, pet bottles, glass bottles and paper cotainers in these contents. Corrosion resistance of both sides, outer and inner, of the can, is a predominant requirement for the can use, and its mechanism has been developed. Corrosion resistance of inner side mainly depends on storage conditions and ingredients of the contents, for example storage temperature, the concentration of chloride ion and residual oxygen. Two types of corrosion at outer side of the cans are popular. One is stress corrosion cracking of aluminum end. The other is secondary corrosion, caused at outer surface of the can with leaked contents. Recent developments, materials, corrosion evaluation methods for Aluminum cans are described.