Caracterización de recubrimientos sintetizados por el método de los precursores poliméricos

Abstract

Ceramic films were formed SiO2-TiO2 system synthesized by the polymeric precursor method from tetraethyl orthosilicate (TEOS) and Titanium tetrabutoxide (TBT), a hydroxycarboxylic acid (citric acid) and polyhydric alcohol (ethylene glycol). The films were deposited monolayer on substrates of AISI 304 steel using the immersion technique (dip-coating). Concentrations were used as precursors Si (silicon) 10% Ti (Titanium) 90%, Si 30% Ti 70% and Si 50% Ti 50% in the system. The influence of coatings on corrosion behavior of the substrate in a solution of hydrochloric acid (HCl), using the technique of Electrochemical Impedance Spectroscopy (EIS). Additionally, the topography was evaluated by scanning electronmicroscopy (SEM) and adhesion of coatings to the substrate. It was found that the values of these parameters change substantially depending on the concentrations of the precursors used in synthesis.

Keywords

• Electrochemical analysis
• electron microscopy
• protective coatings
• chemical synthesis.