CAJ | 학술논문

采用原位水热法在铝合金AA5005表面制备镁铝层状双氢氧化物(LDH)涂层；利用X射线衍射、傅里叶红外、扫描电子显微镜以及能谱仪研究涂层的化学成分、表面形貌及物相；考察溶液pH值对形成LDH的影响。结果表明：当溶液pH值为10.0时，所得到的LDH涂层结晶最好。通过动电位电化学技术以及电化学阻抗研究水热反应时间对 LDH 涂层耐蚀性能的影响。随着水热反应时间的延长，涂层的耐蚀性提高，但当水热反应时间达到8 h时，再继续延长反应时间，其耐蚀性提高不明显。另外，还探讨了LDH涂层的耐蚀机理。
채용원위수열법재려합금AA5005표면제비미려층상쌍경양화물(LDH)도층；이용X사선연사、부리협홍외、소묘전자현미경이급능보의연구도층적화학성분、표면형모급물상；고찰용액pH치대형성LDH적영향。결과표명：당용액pH치위10.0시，소득도적LDH도층결정최호。통과동전위전화학기술이급전화학조항연구수열반응시간대 LDH 도층내식성능적영향。수착수열반응시간적연장，도층적내식성제고，단당수열반응시간체도8 h시，재계속연장반응시간，기내식성제고불명현。령외，환탐토료LDH도층적내식궤리。
MgAl-layered double hydroxides (LDH) coatings were fabricated by the in-situ hydrothermal treatment method on the AA5005 aluminum alloy. The characteristics of the coatings were investigated by XRD, FT-IR, SEM and EDS. The effect of the pH value of the solution on the formation of the LDH coatings was studied. The optimum pH value of the solution was 10.0. The corrosion resistance of the LDH coatings was studied using potentiodynamic polarization tests and electrochemical impedance spectrum (EIS). The results demonstrate that the LDH coatings, characterized by platelets vertically to the substrate surface possess excellent corrosion resistance. The influence of the hydrothermal crystallization time on the corrosion resistance was evaluated. Prolonging the crystallization time can increase the corrosion resistance of the obtained LDH coatings. The anticorrosion mechanism of the LDH coatings was discussed.