Abstract
A superhydrophobic silane coating was modified by incorporating hollow CeO2 nanocontainers loaded with 1,5-naphthalenediol (ND) and used for the corrosion protection of an AA2024-T3 aluminum alloy. The CeO2 nanocontainers exhibited a high loading capacity of 22.1 % for the ND inhibitor. After 8 h immersion, 93 % of the ND inhibitor was desorbed from CeO2@ND nanoparticles in a 3.5 wt% NaCl solution. Electrochemical impedance spectroscopy results indicated that the incorporation of CeO2@ND particles significantly enhanced the polarization resistance and the protection efficiency of the fabricated silane-CeO2@ND hybrid coating was 98.3 %. Additionally, the protection efficiency of the coating slightly decreased to 98.2 % after 25 days of corrosion. Moreover, the scratch test indicated an excellent self-healing capability of silane-CeO2@ND nanocomposite. The outstanding self-repairing property of the coating was depended on the synergistic effects of inhibitive CeO2 nanocontainers and the loaded ND inhibitor.
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