Electropolymerization nanofilm was prepared by cyclic voltammogram with 6N,N-diallylamino-1,3,5-triazine-2,4-dithiol monosodium (DAN) on the AA5052 surface in 0.15M NaNO2 at 10 degrees C, then octyl-triethoxysilane (OTES) film was fabricated on the poly(6N,N-diallylamino-1,3,5-triazine-2,4-dithiol) nanofilm (PDA) covered AA5052 surface by self-assembling method to obtain the composite polymeric nanofilm (C-PDA/OTES). The composite polymeric nanofilm was characterized by means of FTIR spectra, scanning electron microscope (SEM), contact angle, and potentiodynamic polarization. The results showed that the C-PDA/OTES covered surface was more homogenous, compact, hydrophobic compared with PDA covered surface and had excellent protection efficiency. (c) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012