アルミニウムとアルミニウム用はんだの濡れ性の界面インピーダンス応答

抄録

The wettability between solid aluminum and molten tin, zinc and tin-zinc alloy was evaluated by means of an interfacial impedance method. The impedance response between two aluminum plates dipped into the molten metal was measured by a frequency response analyzer. The effects of surface roughness and oxidation of aluminum on the wettability were evaluated by comparing to standard aluminum surface. The equivalent circuit at the interface between the aluminum plates and melts was considered as the parallel connection of resistance and capacitance. The contact angle of metal on aluminum was also measured in vacuum and Ar atmosphere to compare with the impedance method. A small contact angle corresponds to the large capacitance of the equivalent circuit. The large value of capacitance is observed in the cases of higher temperature, the thinner oxide-layer on the aluminum-surface and smoother aluminum-surface. The impedance method, which shows the lower transition temperature for wettability than the sessile drop method, is found to be suited to observe wettability phenomenon. The value of capacitance after achieving a good wettability reaches about 4Fm^-2 in any case of melts.