【摘要】 采用扫描电镜、透射电镜和电化学测试技术研究厚度为95mm2297铝锂合金轧制厚板析出相分布及点蚀行为的厚向不均匀性。通过对析出相的分布及蚀坑尺寸进行统计分析获得定量信息及相应的关系。轧制厚板不同厚度层中的析出相分布密度和尺寸分数由大到小的顺序为1/4厚度层(QS)>表面层(SS)>1/2厚度层(MS)。经300min恒电位极化后,轧制厚板不同厚度层试样的点蚀数量和蚀坑总体积由大到小的顺序为QS>SS>MS,表明厚板含有析出相较多的1/4厚度层具有更高的点蚀敏感性。2297铝锂合金轧制厚板的点蚀行为厚向不均匀性与析出相分布紧密相关。更多还原

【Abstract】 The thorough-thickness inhomogeneity of precipitate distribution and pitting corrosion behavior of 95 mm-thick 2297 Al-Li alloy rolled plate was investigated using scanning electron microscopy, transmission electron microscopy and electrochemistry method. Precipitate distribution and pit size were statistically analyzed to obtain quantitative information and corresponding correlation. The population density and the size fraction of precipitate on different sections in the thick plate are ranked from high to low in the following order: quarter-section(QS) > surface section(SS) > mid-section(MS). After 300 min potentiostatic polarization, the number and the total volume of pits are ranked from high to low as QS>SS>MS, indicating a higher pitting susceptibility of the plate in QS with more precipitates. The through-thickness inhomogeneity of pitting corrosion in 2297 Al-Li alloy thick plate is mainly ascribed to inhomogeneous precipitate distribution.更多还原