Abstract
The protection of mild steel by modified epoxy coating containing colophony microencapsulated corrosion inhibitors was investigated in this study. The corrosion behavior of these epoxy coatings containing colophony microcapsules was studied by electrochemical analysis using cyclic potentiodynamic polarization and electrochemical impedance spectroscopy. The microcapsule coating showed decreased corrosion current densities of 2.75 × 10−8 and 3.21 × 10−8 A/cm2 along with corrosion potential values of 0.349 and 0.392 VSCE for simulated concrete pore solution and deionized water with 3.5 wt.% NaCl, respectively, indicating improved corrosion protection in both alkaline and neutral pH. Electrochemical impedance spectroscopy analysis also showed charge transfer resistance values over one order of magnitude higher than the control sample, corroborating the electrochemical corrosion potential and current density testing results. Overall, the use of colophony microcapsules showed improved corrosion protection in simulated concrete pore solution and DI water solutions containing chloride ions.
Highlights
National Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Dept
The protection measures employed include the use of stainless steel reinforcements [6,7,8,9], the use of corrosion inhibitors [10,11,12], decreasing the porosity of the concrete [13], and applying corrosion protective coatings on steel reinforcements [14,15]
The modified coating was imaged by scanning electron microscope (SEM) and corrosion behavior was tested in simulated concrete pore solution and deionized water contaminated with 3.5 wt.% NaCl
Summary
Reinforced concrete structures are an integral component in the construction industry due to their excellent mechanical properties and formability [1]. Carbonation and the ingress of aggressive ions, such as chlorides, cause passivity breakdown and initiation of steel corrosion [4,5] Protection from these aggressive agents and, corrosion of the reinforcements have been widely studied and various methods have been used. Ouarga et al developed an anticorrosion coating containing phosphorylated ethyl cellulose microcapsules, which enhanced the corrosion protection of mild steel in chloride solution [26]. Few studies have been performed to evaluate the viability of microcapsules containing corrosion inhibitors in protective coatings for use in a concrete environment. A novel epoxy coating containing pH-sensitive colophony microencapsulated corrosion inhibitors was developed and its corrosion behavior studied. The modified coating was imaged by scanning electron microscope (SEM) and corrosion behavior was tested in simulated concrete pore solution and deionized water contaminated with 3.5 wt.% NaCl
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