Research of zinc-aluminum alloy joints

Cd-Sn-Zn solder and ZnCl2-NH4Cl-KF flux that suited to Zn-Al alloy are developed.Technical parameters of furnace soldering and flame soldering that used on alloy are investigated.Soldered joints are analyzed by TEM,SEM and X-Ray methods.Results show that by optimizing,the joints are heated at 320 ℃for 15 minutes and the distance of joints is 0.14 ㎜.There are some rigidity compounds in the interface zone of soldered joints and diffraction relationship between Cd and Mg2Cu6Al5 as (102)Cd//(111)Mg2Cu6Al5,(220)Mg2Cu6Al5//(010)Cd and (224)Mg2Cu6Al5//(211)Cd,which increase the bond strength of joints.Interface zones of soldered joints are wide and contain all the compounds of base metal and sold.Zn is high and Sn is equality distributed in interface zones.It proves that there are acute reactions between solder and base metal.