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

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 i...

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Bibliographic Details
Published in:Materials 2023-11, Vol.16 (23), p.7462
Main Authors: Casanova, Luca, Ceriani, Federica, Messinese, Elena, Paterlini, Luca, Beretta, Silvia, Bolzoni, Fabio Maria, Brenna, Andrea, Diamanti, Maria Vittoria, Ormellese, Marco, Pedeferri, MariaPia
Format: Article
Language:English
Subjects:
Accelerated tests
Adsorption
Alkalinity
Aromatic compounds
Atomic properties
Biocompatibility
Carbon steel
Carbon steels
Cathodic protection
Cement
Chloride
Composite materials
Concrete mixing
Concrete properties
Concrete structures
Corrosion
Corrosion inhibitors
Corrosion potential
Corrosion prevention
Efficiency
Electronegativity
Functional groups
Hydration
Reinforced concrete
Reinforcing steels
Steel
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16237462