The present work aimed at assessing the electrochemical behavior and the corrosion inhibition performance of Mg-Al-layered double hydroxide (LDH) coatings modified with methyltrimethoxysilane (MTMS) and cerium nitrate on AA5005 aluminum alloy. The chemical compositions and surface morphologies of the coatings were investigated by XRD, FT-IR and FE-SEM, while their corrosion resistance was evaluated by electrochemical and immersion tests. An optimum corrosion resistance of the composite coatings was obtained by adding 10⁻² mol·L⁻¹ cerium nitrate. An excess addition of cerium nitrate resulted in a loose structure and poor corrosion resistance of the coating. The corrosion mechanism of the composite coatings was proposed and discussed.

本工作旨在评估AA5005铝合金上用甲基三甲氧基硅烷（MTMS）和硝酸铈改性的Mg-Al层状双氢氧化物（LDH）涂层的电化学行为和缓蚀性能。通过XRD，FT-IR和FE-SEM研究了涂层的化学成分和表面形貌，并通过电化学和浸没测试评估了它们的耐蚀性。通过加入10获得的复合涂层的最佳的耐蚀性^-2莫尔^-1硝酸铈。过量添加硝酸铈导致涂层的疏松结构和差的耐腐蚀性。提出并讨论了复合涂层的腐蚀机理。