Exfoliation Corrosion of As‑Extruded Mg–1Li–1Ca:the Influence of the Superficial Layer  

作　　者：Ze‑Song Wei Zi‑You Ding Lei Cai Shao‑Xia Ma Dong‑Qing Zhao Lan‑Yue Cui Cheng‑Bao Liu Yuan‑Sheng Yang Yuan‑Ding Huang Rong‑Chang Zeng 

机构地区：[1]Corrosion Laboratory for Light Metals,College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]Engineering Research Center for Magnesium‑Based New Materials,Center for Advancing Materials Performance from the Nanoscale(CAMP‑Nano),State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [3]Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials,Advanced Materials Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250014,China [4]Institute of Metals Research,Chinese Academy of Sciences,Shenyang 110016,China [5]Institute of Metallic Biomaterials,Helmholtz-Zentrum Hereon,Max‑Planck‑Str.1,21502 Geesthacht,Germany

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第8期1339-1353,共15页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52071191).

摘　　要：Exfoliation corrosion(EFC)has rarely been reported for wrought magnesium alloys.Enhanced EFC of the as-extruded Mg–1Li–1Ca alloy was observed after the removal of outermost fine-grained skins.The microstructure and corrosion products were investigated using optical microscopy,scanning electron microscopy,electron backscattered diffraction,X-ray diffraction,and Fourier transform infrared spectrometry.The corrosion behavior was analyzed using electrochemical polarization,electrochemical impedance spectroscopy,and scanning Kelvin probe techniques.The results indicated that the surface of Mg–1Li–1Ca,with the superficial layer removed,was more susceptible to EFC.A linear correlation between grain boundary density and corrosion resistance was established.Additionally,the influence of factors such as grain size,intermetallic compounds,different alloy surfaces,and corrosion products on EFC were discussed,and the corresponding EFC mechanism was clarified.

关 键 词：Magnesium alloys Exfoliation corrosion Microstructure Intermetallic compound Metamorphic skin 

分 类 号：TG174.34[金属学及工艺—金属表面处理]