原板内应力对镀锡板耐蚀性的影响

EFFECT OF INTERNAL STRESS IN BLACK PLATE ON CORROSION RESISTANCE OF TINPLATE

通过测试原板的内应力及原板经过相同生产工艺得到的镀锡板的ATC值 ,研究了原板内应力对镀锡板耐蚀性的影响 ,并研究了影响机理。研究结果表明 :原板轧制方向与垂直轧制方向内应力之差 |X -Y|对镀锡板的耐蚀性影响显著 ,耐蚀性随 |X -Y|的上升而上升。研究结果还表明 ,原板的 |X -Y|对镀锡板耐蚀性的影响源于 |X -Y|对原板酸洗后表面状态的影响 ,进而影响锡铁合金层结构 ,而镀锡板的耐蚀性多取决于合金层的结构。

By measuring the internal stress in black plates and the ATC values of the corresponding tinplates, the effect and its mechanism of the internal stress in black plates on the corrosion resistance was studied. The results showed that the |X-Y| value (internal stress difference between rolling direction and its perpendicular direction) influenced the corrosion resistance of tinplate intensely, the corrosion resistance of the tinplate would increase as the |X-Y| value increased. The influence of the |X-Y| value was caused by the superficial condition of the black plate after acid washing, therefore, to affect the structure of alloy layer. The corrosion resistance of the tinplate was dependent on the structure of alloy layer.