Abstract
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.
Highlights
IntroductionCoupling agents are defined as materials that improve the adhesive bonds of dissimilar surfaces by increasing the interfacial adhesion, improving properties such as wettability, rheology, abrasion and catalytic inhibition, and strengthening of the boundary layers.[1]
Coupling agents are defined as materials that improve the adhesive bonds of dissimilar surfaces by increasing the interfacial adhesion, improving properties such as wettability, rheology, abrasion and catalytic inhibition, and strengthening of the boundary layers.[1]Organofunctional silanes are hybrid organic-inorganic compounds that can be used as coupling agents across organic-inorganic interface.[2]
The purpose of this study is to verify the influence of an inhibitor concentration in a bis-[trimethoxysilylpropyl]amine (BTSPA) film by electrochemical methods and to characterize the film morphological and chemically in order to determine if this inhibitor can be used in association with the silane film in order to provide corrosion protection properties for carbon steel substrate
Summary
Coupling agents are defined as materials that improve the adhesive bonds of dissimilar surfaces by increasing the interfacial adhesion, improving properties such as wettability, rheology, abrasion and catalytic inhibition, and strengthening of the boundary layers.[1]. Organofunctional silanes are hybrid organic-inorganic compounds that can be used as coupling agents across organic-inorganic interface.[2] They may be used as adhesion. Silane coatings are “passive” organic coatings, since they act essentially as a physical barrier that hinders the penetration of aggressive species towards the metallic substrate. Applied on different metallic substrates (as zinc,[3,4] steel,[5,6,7] aluminum,[3,8,9] magnesium alloy10), they have been widely studied from both formation and performance points of view.[11]
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