对镁合金机械连接常出现的疲劳失效、高温失效和电偶腐蚀失效的失效机理进行分析,并针对这3种失效可以采取的防止措施进行综述.近年来采用加热自冲铆接、搅拌摩擦盲铆接等新铆接方法以及设计好螺纹连接件直径、选择合适的螺纹连接件材料可以分别提高铆接和螺纹连接接头强度,从而提高接头疲劳性能;防止高温失效的方法是通过合金化提高镁合金抗蠕变性能和选择铝制连接件来减小镁合金与连接件金属的热膨胀系数差异;在提高防电偶腐蚀方面,主要有表面处理、连接件材料优化和接头设计优化3种解决办法.
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