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采用铸锭冶金法,在高频感应炉中制备了铜/铝钎焊用Zn-22Al钎料,通过浸泡腐蚀试验、电化学腐蚀试验对添加Mg元素的钎料的耐蚀性能进行了评价分析,并探讨了其腐蚀机理。研究结果表明,添加Mg元素可显著提高钎料基体的电极电位,从而显著提高钎料本身的耐腐蚀性能,并不会显著降低铜/铝接头的强度。加入Mg元素的Zn-22Al钎料,配合CsF-AlF3无腐蚀中温钎剂,采用高频感应加热钎焊连接铜/铝管,通过浸泡腐蚀试验后,仍可获得高剪切强度的接头。
The ingot metallurgy method was used to prepare Zn-22Al brazing filler metal for copper / aluminum brazing in a high frequency induction furnace. The corrosion resistance of the brazing filler metal was evaluated by immersion corrosion test and electrochemical corrosion test , And discussed its corrosion mechanism. The results show that the addition of Mg can significantly improve the electrode potential of the solder matrix, thereby significantly improving the corrosion resistance of the solder itself, without significantly reducing the strength of the copper / aluminum joint. Addition of Mg element Zn-22Al brazing filler metal, non-corrosive medium-temperature flux with CsF-AlF3, high-frequency induction heating and brazing to copper / aluminum pipe, high shear strength joint can still be obtained after immersion corrosion test.