Preparation of Composite Polymeric Nanofilm of Triazinedithiol and Organosilane on AA5052 Surface and Anticorrosion Performance Analysis
Poly (6-N,N-dibutylamino-1,3,5-triazine-2,4-dithiol) nanofilm (PDB) were prepared by electropolymerization of 6-N,N-dibutylamino-1,3,5-triazine-2,4-dithiol monosodium (DBN) on an aluminum alloy (AA5052) surface. Cyclic voltammetry was used to study the electrochemical polymerization mechanism and the growth process. X-ray photoelectron spectroscopy (XPS) was utilized to identify the structure of PDB. Then, the PDB nanofilm covered surface was silanized in hydrolyzed hexadecyltrimethoxysilane (HDTMS) solution to fabricate the composite polymeric nanofilms (CPDB) by self-assembled technique. The formation mechanism of CPDB was that HDTMS reacted with AA5052 surface which was not adequately covered by PDB nanofilm. The composite polymeric nanofilms were characterized by means of XPS, scanning electron microscope (SEM), contact angle, potentiodynamic polarization and immersion test in 5% NaCl solution. The results showed that CPDB was homogenous, compact, hydrophobic and also had an excellent protection efficiency.
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