Comparative Analysis of Triazine Self-Assembled Nanofilm with/without Fluorine Substituent on Copper Alloy Surface

The self-assembled nanofilms of 6-(N-allyl-1,1,2,2-tetrahydroperfluorodecyl)amino-1,3,5-triazine-2,4- dithiolmon (AF17N) and 6-N,N-diallylamino-1,3,5-triazine-2,4-dithiol monosodium (DAN) were successfully fabricated on copper alloy surface. Surface wettability and coverage of the nanofilms were investigated by contact angle, surface free energy and cyclic voltammetry. Anticorrosion ability and surface morphology of the nanofilms were studied by potentiodynamic polarization, saline immersion test and scanning electron microscopy. The results show that the contact angle of copper surface modified by cured AF17N self-assembled film is up to 124.1° with the lowest surface free energy of 9.653 mJ/m2. Cyclic voltammetry reveals that the cured AF17N and DAN nanofilms are more homogeneous compared with uncured samples. Also, potentiodynamic polarization and saline immersion test demonstrate that the cured AF17N self-assembled film has better anticorrosion ability, which plays a significant role in metal protection and leads a further improvement in corrosion resistance.