About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advanced Coatings for Wear and Corrosion Protection
|
Presentation Title |
Controlled Release of Corrosion Inhibitors by Microencapsulation for Protection of Steel Reinforced Concrete |
Author(s) |
Jacob T. Ress, David Bastidas, Ulises Martin, Juan Bosch |
On-Site Speaker (Planned) |
Jacob T. Ress |
Abstract Scope |
Encapsulation of corrosion inhibitors using smart technologies is an emerging trend in concrete corrosion. In this study, controlled release corrosion inhibitors were developed by microencapsulation of sodium nitrite by colophony pine rosin using the double emulsion synthesis method. The inhibitor release was studied in different pH environments: simulated pore solution (12.6), carbonate buffer solution (9.1), and deionized water (6.8). For greater pH values, the release was found to be significantly higher, concluding that the release of inhibitor is controlled by diffusion through the pores of the microcapsule. The dissolution of colophony at pH values above the pKa (7.2) increases shell porosity, thus inhibitor release. The microcapsules showed favorable performance at higher pH over extended periods of time. Therefore, the smart microcapsules have proven to be a promising method for delivering corrosion inhibitors in reinforced concrete and may be useful for encapsulation and release of a variety of active agents. |