超细层片结构Al-4%Cu合金的点蚀行为  

Pitting Corrosion Behavior of Ultra-fine Lamellated Al-4%Cu Alloy

作　　者：辛叶春 徐伟 赵东杨[1] 张波[1] XIN Yechun;XU Wei;ZHAO Dongyang;ZHANG Bo(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,沈阳材料科学国家研究中心,沈阳110016

出　　处：《中国腐蚀与防护学报》2022年第2期274-280,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2017YFB0702103)。

摘　　要：采用室温冷轧方法制备了具有超细层片结构的Al-4%Cu (质量分数)合金,并利用SEM、TEM、显微硬度测试及动电位极化方法对比研究了晶界处元素偏聚及时效析出相对其点蚀行为的影响。结果表明,冷轧后Al-Cu合金平均层片间距159 nm,晶界处存在Cu的偏聚,其点蚀电位与粗晶样品相当。时效后,超细晶Al-Cu点蚀电位因晶界θ相的析出而降低。可见,Cu偏聚对Al-Cu合金的点蚀行为并无明显影响,但形成富Cu相后对点蚀行为影响显著。The pitting corrosion behavior of ultra-fine lamellated(UFL) Al-4%Cu alloy prepared by cold rolling at room temperature has been studied by means of scanning electron microscope(SEM),transmission electron microscope(TEM), microhardness tester and potentiodynamic polarization measurement aiming to understand the effect of element segregation and precipitates at grain boundaries on pitting corrosion potential. The result shows that the average lamellar spacing of cold rolled Al-Cu alloy is159 nm and there exists obvious segregation of Cu at boundaries. The pitting corrosion potential of the cold rolled Al-Cu is found to be similar to that of the coarse grain ones. After aging treatment, the pitting corrosion potential decreases obviously because of precipitation of second phases at grain boundaries.These results indicate that the element segregation at grain boundaries has no significant effect on the pitting corrosion behavior of Al-Cu alloy, while the precipitation of second phases rich in Cu can have an obvious effect on the pitting corrosion behavior.

关 键 词：超细层片 元素偏聚 析出相 点蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]