Abstract
The electrochemical behaviour and tribological properties of carbon steel coated with bis-[trimethoxysilylpropyl]amine (BTSPA) filled with SiO 2 were evaluated. The silane film filled with SiO 2 was prepared by adding different SiO 2 concentrations. The electrochemical behaviour of the coated steel was mainly evaluated by means of open-circuit potential ( E OC), electrochemical impedance spectroscopy (EIS) and polarization curves, in 0.1 mol L −1 NaCl solution. Structural and morphological characterizations were made by optical, electron and atomic force microscopy (AFM). E OC and EIS data showed that sample filled with 300 ppm SiO 2 presented the highest E OC and total impedance value. AFM measurements showed a homogeneous particle distribution of SiO 2 particles. Nanohardness measurements showed SiO 2 promoted an increase of the hardness mean value (1.70 ± 0.11 GPa to non-filled BTSPA and 2.21 ± 0.05 GPa for sample filled with 300 ppm SiO 2). Silane films when filled with SiO 2 particles improved the corrosion resistance of the steel substrate. The optimum SiO 2 particles concentration in silane solution is 300 ppm SiO 2. Incorporation of an extra amount of silica into BTSPA film led to degradation of the corrosion protection of the film to the substrate.
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