Electrochemical behavior of carbon steel pre-treated with an organo functional bis-silane filled with copper phthalocyanine

Abstract

Neste trabalho, depositou-se sobre aço carbono o filme de bis-[trimetoxisililpropil]amina (BTSPA) adicionado de ftalocianina de cobre (Cu-Ph). Na obtenção desse filme variou-se as concentrações de Cu-Ph e a temperatura de cura (120 e 150 °C) e nas amostras curadas à 150°C, adicionou-se uma segunda camada. O comportamento eletroquímico do aço carbono recoberto com o filme aditivado com Cu-Ph foi estudado por técnicas eletroquímicas (medidas de espectroscopia de impedância eletroquímica e curvas de polarização) em solução aerada de NaCl 0,1 mol L -1 . A caracterização física e química foi feita por análise termogravimétrica (TGA), microscopia eletrônica de varredura, medidas de ângulo de contato e espectroscopia de infravermelho. A TGA não mostrou decomposição da Cu-Ph durante o processo de cura e a quantidade de Cu-Ph adicionada ao filme polissilânico apresentou forte influência na resistência à corrosão, principalmente quando a amostra é curada a 150 °C. Os resultados mostraram que menores concentrações de inibidor forneceram maior resistência à corrosão e a segunda camada aumentou em uma ordem de grandeza a resistência à corrosão.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.

Ultra-high performance fibre-reinforced cementitious composite with steel microfibres functionalized with silane

“…Fig. 1 shows the representation of the procedure of hydrolyse of the TEOS, based on [24,33,34]. Since TEOS is not miscible in water, a 1:1 solution by volume of ethanol (C2H6O with purity higher than 96%) in water was used to disperse the silane.…”

Microwave Assisted Sol-Gel Synthesis of Silica-Spider Silk Composites

“…Additionally, the peaks for CH 3 , CH 2 (1320-1450 cm −1 ), and –CH (900 cm −1 ) were visible in all the spectra except spectrum for SS protein [39]. The presence of Amide I and II in SS-nPM and SS-3F silica nanocomposites along with the other peaks available for nPM and 3F based silica NPs confirm the integration of the SS in the particles observed in SEM and AFM.…”

“…Spectra representing 3F based silica NPs and SS-3F based silica nanocomposites show the C-F stretching and deformation at 840 cm −1 , 1210 cm −1 , and 1260 cm −1 [38]. Peaks at 1210 cm −1 representing the deformation vibration of Si-CH 2 - exist in both 3F and nPM, causing the increased adsorption intensity at 1210 cm −1 in 3F based silica NPs and SS-3F silica nanocomposites as it overlaps with C-F vibration [39]. Strong bands between 1210–1000 cm −1 are due to the stretching vibration of Si-O-Si observed in all spectra except the SS spectrum confirm the presence of 3D polymeric network of SiO 2 [39,40].…”

“…Peaks at 1210 cm −1 representing the deformation vibration of Si-CH 2 - exist in both 3F and nPM, causing the increased adsorption intensity at 1210 cm −1 in 3F based silica NPs and SS-3F silica nanocomposites as it overlaps with C-F vibration [39]. Strong bands between 1210–1000 cm −1 are due to the stretching vibration of Si-O-Si observed in all spectra except the SS spectrum confirm the presence of 3D polymeric network of SiO 2 [39,40]. Another adsorption band around 800 cm −1 is also observed representing Si-O-Si in all the spectra of silica-containing samples [41].…”

The effect of the organosilane content on the barrier features of sol-gel anticorrosive coatings applied on carbon steel

“…All syntheses showed the same spectrum prior to the addition of water. The formation of SieOH bonds created due to hydrolysis reaction are revealed at 3340 cm−1 (peak A) and 950 cm−1 (peak D) [12][13][14]. Whereas, the formation of SieOeSi bonds related to the condensation reaction is reflected by the bands observed between 1000-1200 cm-1 (peak C and B) [3,13,15,16].…”