飲料缶用材料の塗膜下腐食挙動
1994 年 45 巻 8 号 p. 830-834
詳細
1994 年 45 巻 8 号 p. 830-834
The behavior of under-film corrosion on beverage can stocks has been investigated. It was found that;
(1) Lacquer delamination with under-film corrosion is due to a cathodic disbonding reaction beneath the lacquer, which proceeds gradually from the scratched bare site to the neighbouring lacquered site.
(2) Thee degree of delamination has a relatively good correlation with the amount of anodically dissolved iron, but even if an equivalent cathodic reaction occurs beneath the film, the delaminated area is changed by the lacquer delamination characteristics of the interfaces between the lacquer and the substrates.
(3) Materials treated cathodically in chromic acid have high oxygen overpotential and exhibit success in preventing under-film corrosion when not deformed. When deformed, materials with and unbroken coated layer are needed so as to expose less of the bare steel.
