The effect of a tailored electro‐migrating corrosion inhibitor on the corrosion performance of chloride‐contaminated reinforced concrete

Abstract

In this paper, the corrosion performance of chloride-contaminated reinforced concrete in the presence of the electrochemically injected (ECI) imidazoline quaternary ammonium salt (IQS) corrosion inhibitor was investigated, by using electrochemical measurements and surface analysis. The XPS tests showed that ECI treatment not only accelerated the migration rate of IQS corrosion inhibitor in concrete, but also effectively extracted Cl -ions out of concrete, which is beneficial for preventing the corrosion initiation of the reinforcement; further, a larger current density was related to a faster migration rate of IQS corrosion inhibitor. The electrochemical measurements indicated that the ECI treatment significantly increased the corrosion resistance of the reinforcement. The surface observation of the reinforcement revealed that a less amount of corrosion products formed on the reinforcement surface for specimens with the ECI treatment. The related corrosion inhibition mechanisms of the electrochemically injected IQS to embedded reinforcement were also discussed.

Electrochemical Chloride Extraction and Inhibitor Injection in Salt-Contaminated Repair Mortar

“…The benefits of increasing the current density to TBA + ion injection were less significant than chloride removal. The penetration depths of the organic corrosion inhibitor was similar [54] or less than those under some other ECE+EICI modeling [52] or experimental studies [53,55], depending on the specific chemistry of the inhibitor and the microstructure and chemistry of the cementitious materials. The modeling results also confirm that more Na + and K + were transported into the zone close to the steel rebar as a result of increasing current density.…”

Effect of Imidazoline Inhibitor on the Rehabilitation of Reinforced Concrete with Electromigration Method

“…Electrolysis occurs when ions are transferred. And amounts of OHare produced on the surface of the reinforcement, which improves local basicity and is beneficial to the passivation of the steel bar [14,15].…”

“…Organic compounds employed as corrosion inhibitors can adsorb on the metal surface through heteroatoms such as nitrogen, oxygen, sulphur and phosphorus. But the alcamines inhibitor has weak electromigration ability and cannot migrate to the surface of steel effectively [15]. Under high alkaline conditions, the degree of ionization of alcamines inhibitor is limited and not enough to dissociate rust, thus limiting its inhibiting effect [15].…”

“…But the alcamines inhibitor has weak electromigration ability and cannot migrate to the surface of steel effectively [15]. Under high alkaline conditions, the degree of ionization of alcamines inhibitor is limited and not enough to dissociate rust, thus limiting its inhibiting effect [15]. Imidazoline inhibitors are newly trending in the field of electromigration inhibitor research.…”

“…Imidazoline inhibitors are newly trending in the field of electromigration inhibitor research. The imidazoline was reported as an effective organic corrosion inhibitor [15][16][17], and it is a novel, low toxicity and efficient water-based corrosion inhibitor which can effectively inhibit metal corrosion and be used in the neutral medium environment, as well as the acid and alkaline conditions. Wang and Shu [18] synthesized a series of imidazoline inhibitors containing with diethylenetriamine, triethylenetetramine, etc.…”