用金相、扫描电镜及电子探针方法研究了铝钎焊过程中含CdCl_2或ZnCl_2钎剂的活性机制。结论表明,钎剂的活性产生于反应析出的液态重金属与母材及钎料润湿,从而生成局部无氧化膜的液态合金。ZnCl_2析出大片液态合金与母材润湿,而CdCl_2析出分散点滴状液态Cd与母材润湿。实验表明,反应析出的重金属最终夹杂在焊点之中。钎焊温度愈低,重金属夹杂的尺寸愈大。
A study on the interficial activity behavior of flux during aluminumbrazing has been made by using metallography, SEM and electron probe techniques.The results showed that the activity of a flux is caused by the wetting of base me-tal with the liquid heavy metal reduced from the flux, thus, some regions of liq-uid alloy created, at which no aluminum oxide film covers on the surfaces. Thereduced metal drops are finally trapped in the fillet. The size of the metal dropsincreases with the decrease of brazing temperature.
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