Journal of the Brazilian Chemical Society
versão On-line ISSN 1678-4790
SUEGAMA, Patricia H. e AOKI, Idalina V.. Electrochemical behavior of carbon steel pre-treated with an organo functional bis-silane filled with copper phthalocyanine. J. Braz. Chem. Soc. [online]. 2008, vol.19, n.4, pp. 744-754. ISSN 1678-4790. http://dx.doi.org/10.1590/S0103-50532008000400019.
The bis-[trimethoxysilylpropyl]amine (BTSPA) film filled with copper phthalocyanine (Cu-Ph) was prepared by adding different concentrations of copper phthalocyanine - Cu-Ph and deposited on a carbon steel substrate using 120 ºC and 150 ºC as curing temperatures. For samples cured at 150 ºC a second layer was also deposited. The electrochemical behavior of carbon steel coated with BTSPA filled with Cu-Ph was studied by electrochemical measurements, electrochemical impedance spectroscopy (EIS) and polarization curves, in aerated 0.1 mol L-1 NaCl solution. Physical and chemical characterization was made by thermogravimetric analysis (TGA), scanning electron microscopy, contact angle measurements and infrared spectroscopy. TGA showed no decomposition of Cu-Ph during the curing process. Cu-Ph added into the silane film showed a strong influence on its corrosion resistance, mainly when the samples are cured at 150 ºC. The results showed that lower inhibitor concentrations led to a higher corrosion resistance and the second layer increased by one order of magnitude the corrosion resistance.
Palavras-chave : corrosion; silane film; BTSPA; inhibitor.