Liang Jiexi, Deng Binbin, Li Chuanqiang, Dong Yong, Wang Naiguang, Zhang Zhengrong, Wang Shidong
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Materials (Basel). 2023 Sep 27;16(19):6435. doi: 10.3390/ma16196435.
The microstructure and corrosion anisotropy of the Mg-5Li extruded sheet were investigated in this work. Three distinct samples cut from the normal plane (A), longitudinal plane (B), and cross-sectional plane (C) of the as-extruded sheet were prepared. The microstructure was analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The corrosion resistance and behaviors of the three samples in a 0.1 mol/L NaCl solution were evaluated by employing hydrogen evolution, mass loss testing, electrochemical assessments, and corrosion morphology analyses. The results revealed that sample A displayed a distinctive bimodal (0002) basal texture, along with clearly distinguishably larger grain sizes than the other samples. The effect of grain size and crystallographic orientation on the corrosion resistance was highlighted, indicating the pioneering corrosion resistance of sample A and the lowest corrosion resistance of sample C. Furthermore, all three samples exhibited the characteristic filiform corrosion during the initial stages of corrosion, progressing into the formation of corrosion pits, with sample C displaying pronounced susceptibility.
本研究对Mg-5Li挤压板材的微观结构和腐蚀各向异性进行了研究。制备了从挤压态板材的法线平面（A）、纵向平面（B）和横截面平面（C）切割下来的三个不同样品。使用光学显微镜（OM）、扫描电子显微镜（SEM）和X射线衍射（XRD）对微观结构进行了分析。通过析氢、质量损失测试、电化学评估和腐蚀形态分析，评估了这三个样品在0.1 mol/L NaCl溶液中的耐腐蚀性和行为。结果表明，样品A呈现出独特的双峰（0002）基面织构，并且晶粒尺寸明显大于其他样品。突出了晶粒尺寸和晶体取向对耐腐蚀性的影响，表明样品A具有领先的耐腐蚀性，而样品C的耐腐蚀性最低。此外，所有三个样品在腐蚀初期均表现出丝状腐蚀特征，随后发展为腐蚀坑的形成，其中样品C表现出明显的敏感性。
