Ye Xin, Jiang Zimin, Li Linxin, Xie Zhi-Hui
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637002, China.
College of Foreign Language Education, China West Normal University, Nanchong 637002, China.
Nanomaterials (Basel). 2018 Jun 7;8(6):411. doi: 10.3390/nano8060411.
NiAl-layered double hydroxide (NiAl-LDH) coatings grown in-situ on AZ31 Mg alloy were prepared for the first time utilizing a facile hydrothermal method. The surface morphologies, structures, and compositions of the NiAl-LDH coatings were characterized by scanning electron microscopy (SEM), three dimensional (3D) optical profilometer, X-ray diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR), and X-ray photoelectron spectroscopy (XPS). The results show that NiAl-LDH coating could be successfully deposited on Mg alloy substrate using different nickel salts, i.e., carbonate, nitrate, and sulfate salts. Different coatings exhibit different surface morphologies, but all of which exhibit remarkable enhancement in corrosion protection in 3.5 wt % NaCl corrosive electrolyte. When nickel nitrate was employed especially, an extremely large impedance modulus at a low frequency of 0.1 Hz (||), 11.6 MΩ cm², and a significant low corrosion current density () down to 1.06 nA cm are achieved, demonstrating NiAl-LDH coating's great potential application in harsh reaction conditions, particularly in a marine environment. The best corrosion inhibition of NiAl-LDH/CT coating deposited by carbonate may partially ascribed to the uniform and vertical orientation of the nanosheets in the coating.
首次采用简便的水热法制备了在AZ31镁合金上原位生长的NiAl层状双氢氧化物（NiAl-LDH）涂层。通过扫描电子显微镜（SEM）、三维（3D）光学轮廓仪、X射线衍射仪（XRD）、傅里叶变换红外光谱仪（FT-IR）和X射线光电子能谱（XPS）对NiAl-LDH涂层的表面形貌、结构和组成进行了表征。结果表明，使用不同的镍盐，即碳酸盐、硝酸盐和硫酸盐，可以成功地在镁合金基底上沉积NiAl-LDH涂层。不同的涂层表现出不同的表面形貌，但在3.5 wt% NaCl腐蚀电解液中均表现出显著的耐腐蚀性能增强。特别是当使用硝酸镍时，在0.1 Hz的低频下获得了极大的阻抗模量（||），为11.6 MΩ cm²，以及显著降低的低腐蚀电流密度（），低至1.06 nA cm，这表明NiAl-LDH涂层在苛刻的反应条件下，特别是在海洋环境中具有巨大的潜在应用价值。由碳酸盐沉积的NiAl-LDH/CT涂层的最佳缓蚀效果可能部分归因于涂层中纳米片的均匀垂直取向。
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