Recent Advances in the Use of Green Corrosion Inhibitors to Prevent Chloride-Induced Corrosion in Reinforced Concrete

Abstract

Inhibitors for the prevention of corrosion in reinforced concrete are chemical substances able to reduce carbon steel reinforcements corrosion without altering the overall properties of concrete. Today, many commercially available substances have a negative impact on human safety during either the inhibitor synthesis, their handling or application in field. Green corrosion inhibitors are nontoxic, biodegradable and environmentally biocompatible substances. They are generally made of extracts from natural plants or waste, which are abundantly available in several countries. The majority of green inhibitor molecules usually contain multiple bonds, aromatic rings, polar functional groups and electronegative atoms as P, N, S or O; the latter are able to coordinate with metal cations to form protective layers on the metallic surface of the reinforcements, so as to inhibit the development (initiation and/or propagation) of the corrosion process. In this review, the most recent achievements on the study and investigation of green corrosion inhibitors for concrete structures are presented and discussed. Inhibitors are classified based on their nature and inhibition mechanism. The inhibition effectiveness of the substances is compared with the well-established effective nitrite-based inhibitor, distinguishing between accelerated and long-term tests. Based on the available data, a summary of corrosion inhibitors efficiency is reported.

Analysis of the Effectiveness of the Application of Corrosion Inhibitors to Steel Re-Bars Embedded in Concrete

“…This work highlights the importance of seeking sustainable and effective solutions in order to combat corrosion in civil infrastructures. Both studies complement the current understanding of corrosion challenges in reinforced concrete structures, providing valuable insights for the design, maintenance, and management of these key infrastructures [45,46].…”

“…This study provides valuable insights into how corrosion affects load-bearing capacity and structural resilience in the context of seismic events, utilising experimental data based on ASTM guidelines and additional relevant studies. Additionally, in their article "Recent Advances in the Use of Green Corrosion Inhibitors to Prevent Chloride-Induced Corrosion in Reinforced Concrete", Casanova et al (2023) present a review of the latest advances in the development and application of environmentally friendly corrosion inhibitors with which to mitigate chloride-induced corrosion in reinforced concrete structures. This work highlights the importance of seeking sustainable and effective solutions in order to combat corrosion in civil infrastructures.…”

Prediction of the Compressive Strength of Vibrocentrifuged Concrete Using Machine Learning Methods

“…Chlorine and sulfur ions penetrate into the thickness of concrete through places of increased permeability (micro-cracks, capillary, and open pores) and enter into chemical reactions with the formation of new unstable compounds. These crystalline compounds, having a slightly larger volume compared to the volume of the initial phase, cause internal stresses and destroy concrete [8,9,47,48]. The number of wetting and drying cycles varied from 1 to 500 cycles.…”