부산대학교 도서관

In this work, the application of a nanocovering of SiO2 on artificial sulphate patina and exposed to the atmosphere was sprayed with the objective of analyzing the degradation mechanisms and protective capability. The development of the nanocovering was carried out by sol-gel synthesis using as a precursor Orto Tetraethylsilicate (TEOS). The morphological and structural characterization of nanocoating was performed using Scanning Electron Microscopy (MEB) and X-ray Diffraction (DRX), resulting in an amorphous structure of SiO2 and nanoparticle sizes from 82.7 to 92.4 nm. The nanocovering was evaluated using the electrochemical techniques of Polarization Resistance (Rp) and Electrochemical Impedance Spectroscopy (EIE) using a 3.5% NaCl gelled cell and agar as electrolyte. The electrochemical behavior of the coating in the first days showed an increase in the Rtc, after the week of exposure a decrease in the protective properties of the nano coating was observed.