Electrodeposition and Radical Polymerization to Prepare Cross-linked Film of Triazinethiol on Aluminum Surface

摘要

Electrodeposition and radical polymerization technique were applied to fabricate triazinedithiol cross- linked film on aluminum alloy surface. The heterocyclic monomer containing fluorine substituent of 6- (N-allyl-1,1,2,2-tetrahydroperfluorodecyl)amino-1,3,5-triazine-2,4-dithiol monosodium (AF17N) wasfirst electrodeposited on aluminum alloy surface by two-step potentiostat technique. Then 6-N,N- diallylamino-1,3,5-triazine-2,4-dithiol monosodium (DAN) was further polymerized on theelectrodeposition film covered aluminum surface to fabricate the cross-linked film for ameliorating itsanticorrosion efficiency. The wettability of samples was studied by contact angle. The filmcompactness was carried out by cyclic voltammograms method in 0.1% H2SO4 solution. The corrosioninhibition property of the film was demonstrated in 0.5 mol/L NaCl aqueous solution bypotentiodynamic polarization and salty water test. Surface morphologies of aluminum before and afterimmersion tests were observed by scanning electron microscopy (SEM). All results show that thecorrosion inhibition efficiency of electrodeposition film and cross-linked film covered aluminumsubstrates increases markedly. Compared to electrodeposition film, the cross-linked film has bettereffect for protecting aluminum from corrosion.