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Nano-Modified Epoxy Coatings for Enhanced Corrosion Inhibition in Reinforcing Bars

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Abstract

Epoxy coatings are one of the effective methods of physical protection to protect metal from corrosion in aggressive media. In order to maximize the longevity of concrete structures as much as feasible by minimizing corrosion, the current work focuses on enhancing the performance of epoxy coatings applied to reinforcing bars in concrete. This is achieved through the utilization of a synergistic blend of graphene derivatives, including graphene oxide (GO) and reduced graphene oxide (rGO), with carbon nano-tubes (CNTs). The performance evaluation of prepared epoxy-coated samples was conducted using various assessment techniques: non-destructive testing (NDT) monitoring of corrosion current, ultrasonic-guided wave measurement, and visual inspection dictating coatings’ efficacy. In addition to the non-destructive evaluation methods, the results of the epoxy-coated samples were further substantiated through destructive testing (DT). This involved conducting tests for mass loss and residual tensile strength on the corroded reinforcing bars. The combination of NDT and DT results provides compelling evidence that incorporation of nano-filler in the epoxy matrix leads to a substantial augmentation in corrosion inhibition of the coating as opposed to pure epoxy coatings. GO/CNT provides the superior inhibition, as after subjecting the samples to accelerated corrosion testing for over 150 days, the noteworthy outcome was the absence of any indication of corrosion initiation. It point towards remarkable inhibition of corrosion offered by hybrid modification using GO with CNT and is a step towards the goal to reach sustainable construction.

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Acknowledgements

The research is sponsored by Centre of Excellence in Emerging Materials (CEEMS, TIET-VT Centre), Thapar Institute of Engineering and Technology, Patiala, India.

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Correspondence to Nikhil Sharma.

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Sharma, N., Sharma, S., Sharma, S.K. et al. Nano-Modified Epoxy Coatings for Enhanced Corrosion Inhibition in Reinforcing Bars. Trans Indian Inst Met 77, 1423–1431 (2024). https://doi.org/10.1007/s12666-023-03057-2

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