Anti-Corrosion Performance of Migratory Corrosion Inhibitors on Reinforced Concrete Exposed to Varying Degrees of Chloride Erosion

Abstract

This study investigated the anti-corrosion performance of commercial amino alcohol migratory corrosion inhibitors (MCIs) on concrete that underwent varying degrees of chloride erosion. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PD), scanning electron microscopy, and energy dispersive spectroscopy (SEM-EDS) analyses were performed to study the anti-corrosion performance and mechanism of the MCIs on the steel bars. The results indicated that the corrosion resistance of the steel bars in concrete was significantly improved by coating with the MCIs, and the earlier the specimens were coated with the MCIs, the higher the anti-corrosion efficiency. The anti-corrosion efficiency was 55.35% when the MCIs coating was applied before chloride erosion; however, the anti-corrosion efficiency decreased to 3.40% when the MCIs coating was applied after the ninth drying–wetting cycle. The improvement in corrosion resistance of the steel bar in concrete coated with MCIs was due to the protective MCIs-molecule film that formed on the steel bar surfaces, and the oxidative dissolution of iron at the anode was effectively inhibited by the MCIs coating.

The Influence of Recipe-Technological Factors on the Resistance to Chloride Attack of Variotropic and Conventional Concrete

“…In addition to changing the physical and mechanical properties for assessing the destruction of concrete and reinforced concrete caused by chlorides, a common characteristic is an electrical resistivity [36]. To slow down the corrosion of reinforced concrete, various inhibitors are used, the properties of which have been studied by various researchers [37]. The effect of concrete manufacturing technology involving a 3D printer on the course of corrosion and carbonization caused by chlorides is relevant to this study.…”

Cold-Sprayed Composite Metal-Fluoropolymer Coatings for Alloy Protection against Corrosion and Wear

“…However, the most rational, effective, and inexpensive method of protection is the application of coatings [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. It is possible to use a paintwork material [13,19,30] (including those with additives of nanoparticles [25,[31][32][33][34][35][36][37][38] and inhibitors [13,14,20,[39][40][41][42][43][44][45][46][47]) and zinc coating to protect the material against its intensive destruction [48]. There is also a plasma electrolytic oxidation (PEO) method that allows one to create dense heterooxide coatings on valve metals (for example, Al, Mg, Ti, Nb, etc.)…”

Surface Engineering of Migratory Corrosion Inhibitors: Controlling the Wettability of Calcium Silicate Hydrate in the Nanoscale

“…6,7 The use of corrosion inhibitors to improve the quality of concrete is one of the widely used and effective methods; in recent years, the application of green, sustainable, and eco-friendly migratory corrosion inhibitors (MCIs) has become a research hotspot. [14][15][16]18 MCI molecules are transported into concrete pores by capillary action. 21−23 During the transportation process, on the one hand, MCI molecules will form a protective film on the surface of the steel bar to delay the corrosion of the steel bar; on the other hand, when the MCI molecules are transported into the concrete pores, they will be adsorbed on the surface of the pores, blocking the corrosion of aggressive ions, solutions, and vapors to improve the durability of concrete structures.…”

“…There are many strategies that improve the resistance of transmission and the durability of concrete, which can be divided into several parts: increased concrete cover, − coating steel bars, , stainless steel, − and corrosion inhibitors, − among them, improving the quality of concrete is considered to be the most effective strategy. , The use of corrosion inhibitors to improve the quality of concrete is one of the widely used and effective methods; in recent years, the application of green, sustainable, and eco-friendly migratory corrosion inhibitors (MCIs) has become a research hotspot. − , MCI molecules are transported into concrete pores by capillary action. − During the transportation process, on the one hand, MCI molecules will form a protective film on the surface of the steel bar to delay the corrosion of the steel bar; on the other hand, when the MCI molecules are transported into the concrete pores, they will be adsorbed on the surface of the pores, blocking the corrosion of aggressive ions, solutions, and vapors to improve the durability of concrete structures. , According to the capillary principle, the more hydrophilic the pore interface is, the easier the water transmission will be . It is therefore a reasonable assumption that the MCI effectively changes the wettability of concrete micropores.…”