曾以卧滴法测定了表面活性元素S,Mn对液Fe表面张力的影响,并按Gibbs方程计算了S,Mn在液Fe表面的吸附值。为比较计算的吸附值和实测值,本文利用Auger电子谱仪和辉光放电发射光谱对Fe-S和Fe-Mn二元系合金进行了表面逐层分析。结果表明,Mn在合金表面沿深度的分布有一贫Mn区;Fe-S系也出现贫硫区;同时观察到,硫在表面的富集系数(C_s~s/C_b~s)较Mn约高两个数量级。这与研究Fe-S和Fe-Mn系的表面现象计算的结果相近。
The effect of the surface active elements S and Mn on the surface tension of liquid Fe was investigated by the sessile drop method and their adsorptivity on the liquid Fe surface was calculated by the Gibb's equation. In order to compare the calculated with directly measured adsorption values, the distribution of S and Mn along different depth from the surface of liquid Fe-Mn and Fe-S binary system was analysed layer by layer by AES and/or glow discharge emission spectroscopy. Results indicated that a Mndepleted zone appeared along the depth of surface layer of alloy, and it is the same to S. The higher surface active element S is found to have a greater segregation coefficient about two orders of magnitude of that of Mn. This is analogous to the previous works on calculation of adsorption values from surface tension for the Fe-Mn and Fe-S binary systems.
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