Corrosion Behavior of the Inner Surface of Unlacquered Tinplate Cans for Fruit Use

Abstract

The corrosion behavior of the inner surface of commercially available pineapple cans (unlacquered tinplate cans) were investigated using accelerated pack test and electrochemical measurements. In the accelerated pack test, the tin concentration in the contents increased over time. The increase was greater as the tin-iron alloy layer became exposed, and the internal pressure also increased. Electrochemical measurements showed that the corrosion potentials of tin, iron, and the tin-iron alloy layer were increasingly noble, in that order, supporting the corrosion behavior of tin in the accelerated pack test. Based on these results, it is suggested that corrosion of the inner surface of the can is represented by five stages.