PSI - Issue 64

Hideki Oshita et al. / Procedia Structural Integrity 64 (2024) 48–55 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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values lead to greater corrosion prevention effects. However, despite the significantly larger magnitude of the induced corrosion current density shown in Fig.7 compared to the reference value, iron reinforcement corrosion still occurred. This is likely because the corrosion current density in the axial direction of the reinforcement was lower than 1 A/m² in all test specimens, preventing effective suppression of axial corrosion current. Increasing the axial corrosion current density remains a future challenge. In summary, compared to the iron reinforcement without electromagnetic induction, the test specimens with electromagnetic induction exhibited significantly less corrosion product formation, confirming the corrosion prevention effect of this method against microcell corrosion. 4. Conclusions This research aims to develop a method for preventing corrosion of reinforcing bars in RC structures using non destructive and non- contact techniques. By inducing induced currents in the rebars’ interior through electromagnetic induction and suppressing the formation of anodes and cathodes on the rebar surface, this method effectively prevents rebar corrosion. • In this research, a novel electrochemical corrosion prevention method based on the principles of electromagnetic induction was proposed. The effectiveness of this method was confirmed through experiments on macrocell and microcell corrosion test specimens. • The corrosion prevention mechanism using electromagnetic induction relies on the induced current on the rebar surface, which acts as a protective current. By inhibiting the formation of anodes and cathodes, it effectively prevents rebar corrosion. The extent of this corrosion protection depends on the direction and magnitude of the induced current density at the rebar surface. • When applying this method to small-scale structural test specimens (specifically, specimens S-A5-F500 and S A10-F500), the average corrosion rates were reduced to 0.08% and 0.05%, respectively, compared to specimens without electromagnetic induction. This represents a corrosion reduction of 71% and 83%, respectively. References Kanbara, M., 1969. Theory and practice of impressed current protection system, Bulletin of the Society of Naval Architects of Japan, Vol. 476, 86 91. Shigeno, J., 1957. Galvanic anode system, Journal of the Surface Finishing Society of Japan, Vol. 8, Issue 1, 25-30.