挤压铸造Al-Cu-Mn和Al-Zn-Mg-Cu合金耐腐蚀性能研究  

Corrosion Properties of Al-Cu-Mn and Al-Zn-Mg-Cu Prepared by Squeeze Casting

作　　者：林波[1] 汪先送[1] 程佩[1] 张卫文[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《铸造技术》2012年第5期521-524,共4页Foundry Technology

基　　金：GD-NSFC联合基金项目(U1034001);国家科技支撑计划项目(2011BAE21B00);省部产学研重点专项(2009A090100026);广东省科技攻关项目(2008A010300003)

摘　　要：采用酸性盐雾试验,对Al-4.5Cu-0.8Mn和Al-7.3Zn-2.9Mg-1.9Cu 2种挤压铸造合金的耐腐蚀性能进行了对比研究。结果表明,在盐雾腐蚀过程中,随着腐蚀时间的延长和压力的增大,两种合金的耐腐蚀性能都出现了一定程度的下降。前者的腐蚀是由分布于枝晶间和晶界处的T(Al12CuMn2)和θ(Al2Cu)相溶解引起的,后者的腐蚀是由合金中η相的优先溶解,以及沿晶界分布的S相边沿的(Al)基体溶解所致;前者的耐腐蚀性能明显优于后者。The corrosion properties of Al-4.5Cu-0.8Mn and Al-7.3Zn-2.9Mg-1.9Cu alloys by Squeeze Casting were comparatively studied with acid salt spray test.The results show that with the increase of corrosion time and applied pressure,the corrosion properties of both alloys decrease during acid salt spray test.The corrosion of Al-4.5Cu-0.8Mn alloy results from dissolveng of T-phase（Al12CuMn2） and θ-phase（（Al2Cu）） distributed in interdendritic boundary and grain boundary in each other;while,the corrosion of Al-7.3Zn-2.9Mg-1.9Cu alloy results from the preferential dissolution of η-phases and the dissolution of（Al） matrix around the S-phases which lies in the grain boundary.In conclusion,the corrosion properties of Al-4.5Cu-0.8Mn alloy is better than Al-7.3Zn-2.9Mg-1.9Cu alloy.

关 键 词：铝合金 挤压铸造 腐蚀 

分 类 号：TG171[金属学及工艺—金属表面处理]