Steel corrosion in simulated carbonated concrete pore solution its protection using sol-gel coatings
2015
Criado, María | Sobrados, Isabel | Bastidas Rull, José María | Sanz Perucha, Jesús | Ministerio de Ciencia e Innovación | Consejo Superior de Investigaciones Científicas
The corrosion features of polysiloxane hybrid films deposited on carbon steel substrates by dip-coating are compared. Sol-gel coatings were prepared by condensation and polymerization of TEOS/MPTS, TEOS/MTES, TMOS/MPTS and TMOS/MTES mixtures in three molar ratios to assess the influence of their components. The corrosion protection of the coatings was evaluated by means of polarization curves and electrochemical impedance spectroscopy measurements. Coating thickness and composition were quantified by field emission scanning electron microscopy equipped with an EDX analyzer. The results show that all the coatings improved the corrosion resistance of carbon steel in a carbonated synthetic solution, with especially improved protective properties in the case of the TMOS/MTES mixture. These best properties could be due to a highly cross-linked network and greater adhesion to the metallic surface, restricting the corrosion attack.
Show more [+] Less [-]M. Criado expresses her gratitude to the Spanish Ministry of Science and Innovation for the Juan de la Cierva contract (Ref. JDC–2010).
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