液体金属とフラックスとの間の界面張力に関する研究（第2報）Snとフラックスとの間の界面張力について

抄録

The surface tension of fluxes and the interface tension between molten Sn and fluxes were measured by the maximum bubble method and the drop weight method, respectively, in the temperature range of 300∼500°. The fluxes used were ZnCl₂, SnCl₂ and mixtures of ZnCl₂ and NH₄Cl NaCl, KCl or SnCl₂. The results obtained are summarized as follows: (1) The surface tension of SnCl decreased while the surface tension of ZnCl₂ increased with rising temperature. (2) The surface tension of mixed fluxes increased as the quantity of the 2nd or the 3rd element added to ZnCl₂ increased. (3) The interface tension between Sn and ZnCl₂ is expressed by the following equation: σ=730.4−0.564θ; where σ: interface tension, dynes/cm, θ: temperature, °C; (4) In the case of Sn and 2 component fluxes, it may be said that the addition of NH₄Cl to ZnCl₂ results in a larger decrease of the interface tension than the addition of NaCl, but the addition of SnCl₂ shows no effect and the addition of KCl shows a small increase of the interface tension. (5) In the case of Sn and 3 component fluxes, by the addition of the 3rd elements (NaCl, SnCl₂) to ZnCl₂-NH₄Cl, the decreasing effect of the interface tension by the 2nd element (NH₄Cl) was lost.