Ga、Al对Sn-Zn钎料耐蚀及高温抗氧化性能的影响

Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

摘要:

采用侵蚀失重法研究Ga、Al对Sn-9Zn钎料在3.5%NaCl水溶液中耐腐蚀性的影响。结果表明，添加Ga元素后，腐蚀产物的粘附性提高，均匀覆盖在钎料表面上，提高了钎料的耐蚀性能；添加Al以后，Zn和Al被选择性腐蚀，腐蚀随着Al含量的增加而加剧。采用热重分析(TGA)和俄歇电子能谱(AES)研究Ga、Al对Sn-9Zn钎料高温抗氧化性的影响。结果表明，Ga可在钎料表面形成一层集肤层；Al可在钎料表面形成一层致密的氧化膜，两者均可阻挡空气中的氧向钎料内部扩散，从而大大改善钎料的高温抗氧化性。

Abstract:

Effects of Ga and Al additions on the corrosion resistance of Sn-9Zn lead free solder in 3.5% NaCl solution were researched by erosion mass loss evaluation. Effects of the additions on high-temperature oxidation resistance of the solder were investigated by TGA and AES. Results indicate that the corrosion resistance of Sn-Zn solders is improved by addition of Ga, for the corrosion products exhibit better adhesiveness on the solder surface after adding Ga; however, with Al addition, the corrosion resistance deteriorates for the selective erosion of Al and Zn. The TGA results show that the high-temperature oxidation resistance of Sn-9Zn solder is observably improved by adding Ga or Al; the AES analysis shows that Ga could form a protective skin on the solder surface, while Al can form a dense protective oxidation layer, both of which can hinder diffusion of the oxygen to the inner.