时效处理工艺对1975合金腐蚀性能的影响  

Effects of Aging Treatment on Corrosion Properties of 1975 Aluminum Alloy

作　　者：赵凯[1] 尹志民[1] 段佳琦[1] 邓英[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《中国腐蚀与防护学报》2013年第2期153-158,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家民口配套项目(JPPT-115-2-948)资助

摘　　要：采用恒温浸泡、极化曲线、金相、扫描电镜和透射电镜技术研究不同时效处理工艺对1975铝合金的晶间腐蚀、剥落腐蚀和应力腐蚀行为的影响。结果表明,1975铝合金单级时效后的晶间腐蚀、剥落腐蚀和应力腐蚀的敏感性变化规律为:欠时效(120℃/12 h)>峰时效(120℃/24 h)>过时效(120℃/36 h)。合金的腐蚀敏感性与晶界析出相η(MgZn2)和无沉淀析出带(PFZ)的特征有关,析出相分布越不连续,尺寸越大,无沉淀析出带越宽化,合金的腐蚀敏感性越低;反之,如果晶界析出相链状分布且尺寸较小,则合金的腐蚀敏感性高。The intergranular corrosion, exfoliation corrosion, stress corrosion properties of 1975 aluminum alloy with different aging treatments were investigated using constant temperature immersion corrosion method, polarization curve measurement, optical microscopy, scanning electronic microscopy （SEM） and transmission electron microscopy （TEM） analysis. The results showed that the sensibility of intergranular corrosion, exfoliation corrosion and stress corrosion of 1975 aluminum alloy arranged in order as followed： underaging （120 ~C/12 h）〉peak-aging （120 ℃/24 h）〉 overaging （120℃/36 h）, which was attributed to the characteristic of grain boundary precipitation phase η （MgZn2） and precipitation free zone （PFZ）. When the equilibrium phase η distributed uncontinuously and had large size as well as the PFZ was wide, the corrosion sensibility was low. In contrast, when the grain-boundary equilibrium phase had continuous distribution and small size, the corrosion sensibility was high.

关 键 词：1975合金 时效处理 腐蚀性能 

分 类 号：TG172.6[金属学及工艺—金属表面处理]