RRA处理对1973铝合金晶间腐蚀与剥蚀的影响  

Influence of retrogression and re-aging treatment on intergranular and exfoliation corrosion of 1973 aluminum alloy

作　　者：龚静[1] 汪明朴[1,2] 张茜[1] 盛晓菲[1] 杨文超[1] 李周[1,2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学教育部有色金属材料科学与工程实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第7期2520-2527,共8页Journal of Central South University:Science and Technology

基　　金：国家高技术研究发展计划("863"计划)项目(2006AA032517);湖南省博士生科研创新项目(CX2010B044)

摘　　要：采用维氏硬度、室温拉伸、极化曲线测试和晶间腐蚀、剥落腐蚀试验等方法,并结合金相(OM)和透射电镜(TEM)分析,研究回归再时效(RRA)过程对1973铝合金力学性能及晶间腐蚀和剥落腐蚀的影响。研究结果表明:1973铝合金经不同时效处理后晶间腐蚀和剥落腐蚀趋势相同,耐蚀性能由大到小的RRA工艺顺序为:200℃,60 min;180℃,60 min;180℃,40 min;180℃,20 min;T6。RRA 180℃处理适量时间可提高1973铝合金的强度和抗晶间腐蚀和剥落腐蚀性能,并且随着回归时间的延长耐蚀性能提高,但强度有所下降。而RRA 200℃,60 min处理与180℃处理相比,虽然有更好耐蚀性能,但是强度损失太大。因此,1973铝合金经RRA 180℃,60 min处理后具有较好的综合性能。The influence of retrogression and re-aging treatment （RRA） process on mechanical properties and the intergranular and exfoliation corrosion of 1973 aluminum alloy were investigated using hardness measurement, constant tensile properties test, polarization curve measurement, intergranular and exfoliation corrosion tests, optical microscopy （OM） and transmission electron microscopy observation （TEM）. The results show that the intergranular corrosion trend is the same as that of exfoliation corrosion after different aging treatments, and the RRA process order of descending corrosion resistance is that： 200 ℃, 60 rain; 180 ℃, 60 min; 180 ℃, 40 min; 180 ℃, 20 rain; T6. The strength and the resistance of intergranular and exfoliation corrosion of 1973 almninum alloy can be enhanced with the retrogression and re-aging treatment at 180 ℃. As the retrogression and re-aging treatment at 200 ℃ for 1 h the corrosion resistant of 1973 aluminum alloy increases, however its strength decreases greatly. Retrogression and re-aging at 180 ℃ for 1 h is a suitable processing for 1973 aluminum alloy to have good combination properties.

关 键 词：晶间腐蚀 剥落腐蚀 回归再时效 

分 类 号：TG146.21[一般工业技术—材料科学与工程]