Multi-functional organic corrosion inhibitor

Efficiency of Migratory-Type Organic Corrosion Inhibitors in Carbonated Environment

“…1 Cross-sectional details of (a) bare steel specimen used for synthetic solution (b) rebar embedded in concrete specimens. sion, organic-based corrosion inhibitors are found to be effective (Heiyantuduwa et al 2006;Monticelli et al 2011;Nmai 2004;Montemor et al 2002;Jamil et al 2004). Therefore, organic compounds such as ethanolamine, amine-ether based corrosion inhibitor, aminoalcohol based corrosion inhibitor, Anthranilic acid were chosen for present research.…”

“…Once reached at the surface of the rebar they get adsorbed at the metal surface forming protecting barrier. The efficiency of these organic corrosion inhibitors is related to the presence of polar functional groups with S, O or N atoms in the molecule (Tritthart 2003;Nmai 2004) .They are more effective in protecting the bar prior to initiation of active corrosion and formation of rust layer. The penetration of the inhibitors upto rebar and subsequent adsorption at the metal surface thus results in depassivation.…”

Research on Concrete Durability Improving for Existing Island-Building and Its Application

“…Under the action of an external electric field, the rust inhibitor cations in the electrolyte will enter the protective layer and migrate to the cathode (steel bar), while the Cl-in the test piece will migrate to the anode (Zhang, 2012). When the rust inhibitor concentration reaches a certain value in the surface of steel bar, the steel surface will form a layer of dense protective film, separating the chlorine ion, oxygen, and other corrosive media from the steel bar to play the role of rust resistance (Nmai, 2004). At the same time, due to the continuous reaction in the cathode, the OHcontinues to produce making the pH value in the pore fluid near the steel bars increased, which is beneficial to the passivation of steel bars.…”

Organic corrosion inhibitor of triethylenetetramine into chloride contamination concrete by bidirectional electromigration rehabilitation

“…These kinds of inhibitors are mostly based on particular amines and alkanolamines or their compounds, which are claimed to be capable of diffusing considerable distances through concrete by capillarity when applied on the surfaces of the structures (Morris and V zquez 2002;Morris et al 2003). Although these corrosion inhibitors proved to be effective in preventing reinforcement from corrosion within concrete structures (Nmai 2004;Ormellese et al 2011), it should be emphasized that the surface-applied inhibitors can hardly penetrate to the depth of embedded steel reinforcement, reaching adequate concentrations to provide corrosion protection when the concrete cover is too thick or the concrete compaction is too high (Montemor et al 2003;Bolzoni et al 2006). Then the possibility of using electrical fields to accelerate their ingress in concrete has been explored.…”