Abstract
In this paper, galvanized steel substrates were pre-treated in [Formula: see text]-(2,3-epoxypropoxy)propyl trimethoxy silane solutions containing salts ((NH[Formula: see text]TiF6, K2ZrF6 and NaVO[Formula: see text] and SiO2. The surface microstructures of the coated substrates were evaluated by scanning electron microscopy (SEM). The anti-corrosion performance of the modified silane film applied on galvanized steel substrates was evaluated by potentio-dynamic polarization (Tafel) and electrochemical impedance spectroscopy (EIS). The electrochemical results reveal that the addition of salts ((NH[Formula: see text]TiF6, K2ZrF6 and NaVO[Formula: see text] may produce a more stable and protective fluoride combined with their oxides in the silane layer. The results also reveal that the addition of the SiO2 nanoparticles reinforced the barrier properties of the silane films and imparted its corrosion inhibition ability.
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