RESEARCH ARTICLE
Service Life Prediction of Inhibitors and Concrete Surface Coatings in Concrete-Embedded Reinforcing Steel Corrosion Caused by Chloride
Sreenivasa M B1, *, M. Nagesh2, Raghubabu Uppara3
Article Information
Identifiers and Pagination:
Year: 2024Volume: 18
E-location ID: e18741495297798
Publisher ID: e18741495297798
DOI: 10.2174/0118741495297798240306060807
Article History:
Received Date: 15/02/2024Revision Received Date: 26/02/2024
Acceptance Date: 27/02/2024
Electronic publication date: 14/03/2024
Collection year: 2024
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Abstract
Background
Inorganic corrosion inhibitors and surface coatings have a number of drawbacks, such as high costs, toxicity to the environment, poor degradation, and environmental pollution. Green plant-derived corrosion inhibitors are being investigated extensively as a potentially useful substitute for conventional toxicity inhibitors.
Objective
In this study, we have tried to employ Calotropis gigantea and Azadirachta indica as environmentally friendly inhibitors to improve the chloride-induced corrosion resistance of reinforcing steel in concrete. The inhibitor efficiency of environmentally friendly inhibitors has been compared with chemical inhibitors and surface coatings.
Methods
The half-cell method and the linear polarization resistance method have been used to investigate the corrosion inhibition properties of steel bars embedded in cylindrical concrete specimens with different types of green inhibitors, chemical inhibitors, and surface coatings.
Results
The addition of Calotropis gigantea and Azadirachta indica leaf extracts to fresh concrete demonstrated a positive impact on corrosion resistance with control mixes. The efficiency of corrosion resistance increased with chemical inhibitors and surface coatings. Corrosion resistance has been found to be higher in concrete samples coated with surface coatings. From the results, surface coating has been found to exhibit the highest efficiency than the chemical and green inhibitors.
Conclusion
Overall, the study has demonstrated that, in cases of chloride contamination, surface coatings, particularly polyurethane ones, can provide protection against rebar corrosion. Organic inhibitors have shown promise as non-toxic, environmentally benign substitutes, despite their lower effectiveness.
