纯Al和AA2037铝合金腐蚀相关缺陷的正电子湮没研究

纯Al和AA2037铝合金腐蚀相关缺陷的正电子湮没研究 Corrosion-Related Defects of Pure Aluminum and AA2037 Aluminum Alloy Studied Using Positron Annihilation Spectroscopy 吴奕初 WU Yichu1 1 first-author 符琴敏 FU Qinmin1 1 胡懿 HU Yi1 1 姜静 JIANG Jing1 1 薛旭东 XUE Xudong1 1 李培海 LI Peihai1 1 翟同广 ZHAI Tongguang2 2 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 Chemical and Materials Engineering Department,University of Kentucky Chemical and Materials Engineering Department,University of Kentucky Chemical and Materials Engineering Department,University of Kentucky Chemical and Materials Engineering Department,University of Kentucky School of Physics and Technology,Wuhan University School of Physics and Technology,Wuhan University 应用慢正电子束多普勒展宽技术研究了纯Al和AA2037铝合金与腐蚀相关的缺陷.慢正电子束多普勒展宽测量是通过改变正电子的能量,测量正电子湮没的多普勒展宽谱,分析得到了不同正电子能量的S参数和S-E曲线,然后对S-E曲线进行了分析和处理以得到材料表面及近表面的缺陷真实分布.实验结果表明,纯Al与在1mol/LNaOH溶液中腐蚀引起了纳米尺度界面缺陷的产生,导致S参数明显上升;而水淬AA2037铝合金腐蚀后引起S参数明显下降,其原因可能是Cu在氧化层与基体界面富集.通过原子力显微镜（AFM）观察证实了纯Al样品表面经过腐蚀后有大量几百纳米大小的孔洞产生,而AA2037铝合金中只有少量的孔洞产生. Corrosion-related defects of pure Al and AA2037 Al alloy were investigated by measuring Doppler broadening energy spectra of positron annihilation.Defect profiles of the S parameter as a function of positron incident energy up to 30 keV were analyzed.When the sample is treated with 1 mol/L NaOH immersion for various dissolution time,a significant increase in the S parameter in pure Al is observed.This corrosion process shows the presence of defects and voids of a few nanometers near the surface.However,a significant decrease of the S parameter in water-quenched Al alloy after corrosion is observed,which is interpreted as enrichment of Cu within metal-oxide interface layer.AFM images of NaOH-dissolved samples show that there exist a lot of cavities in pure Al,but only a few cavities in Al alloy. 正电子湮没 铝合金 腐蚀 缺陷 positron annihilation aluminum alloy corrosion defect 10.14188/j.1671-8836.2010.06.007 TG171 国家自然科学基金资助项目（10975110）;西北工业大学凝固技术国家重点实验室开放课题基金项目（SKLSP201004） 2010-06-01 2021-04-01 6 56