1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China 2. School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China 3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China 4. Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, China 5. School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China
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.
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