Generation reason and corrosion characteristic of cavity of tinplate alloy layer^①

来源期刊：中南大学学报(英文版)2004年第4期

论文作者：黄久贵 李宁 周德瑞

文章页码：362 - 366

Key words：inplate alloy layer; scanning electron microscopy; glow discharge spectrum; electrochemical atomic force microscope; corrosion resistance

Abstract: The surface morphology of alloy layer of tinplate was studied by means of scanning electron microscopy. By using the layer on layer debonding technology of glow discharge spectrum, the contents of C and O at the boundary of alloy layer and black plate were analyzed. And the corrosion characteristic of cavity of tinplate alloy layer was studied online and in-situ by means of electrochemical atomic force microscope. The corrosion depth of cavity of alloy layer in-situ after different corrosion time was measured. The results show that the cavity of alloy layer is a critical factor causing rapid decline of corrosion resistance of tinplate, and the formation of cavity of alloy layer is due to incorrect pretreatment of black plate before electrotinning. The cavity of alloy layer is the internal factor causing pitting corrosion of tinplate when the tinplate is applied to food packaging material. And the dynamic equation of pitting corrosion generated in the cavity of alloy layer conforms to logarithm law.