利用本文作者等最近发展的量电法,进一步研究了18Cr-8 Ni型不锈钢的贫Cr区。在不同电位下测定J-t曲线并对所得溶液进行分析的结果表明,贫Cr层是由贫Cr程度不等的连续区域组成的.对于在650℃敏化处理2小时的18Cr-8Ni型不锈钢说来,贫Cr层中含Cr量低于8.7％的仅128埃(Cr_(23)C_6的每一侧),低于16.1％的仅384埃,而整个贫Cr区宽度则达200埃左右。这样,利用这一方法,我们第一次定量地得出了Cr在贫Cr层中的分布图。
The distribution of chromium in the chromium-depleted zone of a sensitized (650℃,2 hrs.) 18-8 stainless steel was studied by our coulometric method. A sheet of stainlesssteel was held at a potential at which the chromium-depleted zone is active whereas theregions with higher chromium contents remain passive. Since the different parts of thedepleted zone contain different amounts of chromium and thus have different passivatingproperties, they can be "extracted" fractionally at different potentials and allow theirwidths and compositions to be determined separately. Using this method, it is shown that the chromium-depleted zone consists of layersof continuously varying chromium contents and passivating properties. The total widthof the depleted zone is about 2000A, but that containing less than 8.7％ Cr is only128A (on each side of Cr_(23)C_6) and that containing less than 16.1％ Cr is only 384A,etc. Thus, the distribution diagram of chromium in the depleted zone is for the firsttime quantitatively obtained (Fig. 2).
参考文献
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