抄録
The interface tension of Sn-Pb alloys in ZnCl2 flux was measured by the drop weight method in the temperature range of 350∼500°C. The results obtained are summarized as follows: (1) A linear relation exists between the interface tension and temperature. (2) The interface tension is lower by about 100 (in Pb)∼200 (in Sn) dynes/cm than the surface tension, and the absolute values to temperature coefficient of interface tension become 1.3 (in Pb)∼2.0 (in Sn) times as large as that of the surface tension. (3) On the Sn side, the interface tension of the alloys decrease abruptly with the additional quantity of Pb, for Pb is the surface-active substance to Sn. On the other hand, on the Pb side, the interface tension becomes higher to correspond with the change of the activity. (4) The adsorption heat of Pb to the alloy surface is about 6∼7 kcal/mol.
