铜铝连接用Zn98-Al钎料脆化机理  

Research on embrittlement mechanism of Zn98-Al filler metal for Cu / Al joining

作　　者：吕登峰[1] 龙伟民[1] 钟素娟[1] 沈元勋[1] 王星星[1] 齐剑钊[1] 

机构地区：[1]郑州机械研究所新型钎焊材料与技术国家重点实验室,河南郑州450001

出　　处：《焊接技术》2014年第8期37-40,2,共4页Welding Technology

基　　金：国家科技支撑计划项目(2012BAB18B04);国家高技术研究发展计划(863计划)资助项目(2012AA040208);郑州市重大科技专项(131PZDZX032);华南理工大学国家金属材料近净成形工程技术研究中心开放基金资助项目(2013001)

摘　　要：Zn98-Al钎料在湿热环境中常发生时效劣化行为,使其脆性增大,伴随而至的是钎焊工艺性下降。为探索其脆化原因,文中通过室内湿热加速腐蚀试验模拟湿热大气环境,采用光学显微镜、扫描电镜、XRD等分析手段对加速腐蚀环境下Zn98-Al钎料的显微组织进行研究。结果表明,腐蚀主要发生在晶界处,钎料内形成了腐蚀裂纹和腐蚀孔洞;Zn98-Al钎料的晶间腐蚀是晶内η相为阴极,晶界处α相为阳极而溶解的电化学腐蚀;水蒸气腐蚀后Zn98-Al钎料晶界处O含量和Al含量比较高;XRD分析表明,钎料表面腐蚀产物主要有Al2O3,ZnO,Al(OH)3,Zn(OH)2,钎料在湿热环境中发生电化学腐蚀,同时伴随着高温氧化。The aging degradation behavior of Zn98-Al filler metal in hot and humid environment during storage affected the brazing technology. High temperature and high humidity accelerated test was utilized to simulate the hygrothermal atmospheric corrosion conditions. Microstructure of Zn98-Al filler metal in accelerated corrosion environment were researched by optical microscope, scanning electron microscopy and X-ray diffraction. The results of the experiment indicated that water vapor corroding primarily occurred at the grain boundaries, corrosion crack and corrosion holes were formed in the filler metal. Intergranular corrosion of Zn98-Al filler metal process was electrochemical corrosion that the η phase as cathode of intragranular, the α phase dissolution as the anode of grain boundary. After water vapor corrosion, oxygen and aluminum content of Zn98-Al solders in grain boundary was higher. XRD analysis showed that corrosion products in the surface of Zn98-Al filler metal were mainly Al2O3, ZnO,Al(OH)3and Zn(OH)2. The filler metal in hygrothermal environment undergoed electrochemical corrosion with oxidation.

关 键 词：Zn98-Al钎料 显微组织 晶间腐蚀 湿热环境 

分 类 号：TG425[金属学及工艺—焊接]