铜铝钎焊用Zn-Al钎料的电化学腐蚀性能的研究
Research of electrochemical corrosive characteristics of Zn-Al Solders for Al/Cu Brazing
王凯，刘正林，杨凯珍
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作者单位：广州有色金属研究院
中文关键字：铝铜钎焊；Zn-Al 钎料；电化学腐蚀；阳极极化
英文关键字：Al/Cu brazing; Zn-Al solders; electrochemical corrosion；anodic polarization
中文摘要：使用高频感应炉通过铸锭冶金法制备了铜/铝钎焊用Zn-Al钎料，通过浸泡腐蚀试验、电化学腐蚀实验对添加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-Al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。
英文摘要：Zn-Al solders used for Zn/Al brazing were prepared by ingot metallurgy method through high frequency induction furnace. The anti-corrosive properties of Zn-Al solders added with Mg were evaluated and analyzed by immersion tests, electrochemical corrosion measurements, and the corrosive mechanism was discussed. The results show that the electrode potential of the solders substrates can be significantly improved by the addition of Mg to significantly improve the anti-corrosive properties of solders, while it will not significantly reduce the shear strength of welding joint. Using the Zn-Al solder added with Mg and CsF-AlF3 flux，Al and Cu tubes can be brazed by high frequency brazing method without air leaking at high air pressure even after immersion tests.