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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(b) Measuring Method for Corrosion Rate The measuring method for corrosion rate involved the mass of the reinforcing bar after removing the passive film before the experiment and then measuring the mass of the corroded reinforcement after the experiment by immersing it in a 10% citric acid solution to remove corrosion products. The corrosion rate was defined as the decrease in mass of the reinforcement before and after the experiment, divided by the initial mass of the reinforcement. Additionally, the reduction rate of corrosion due to the presence or absence of electromagnetic induction was defined as the change in the amount of corrosion of the reinforcement. (c) Corrosion Prevention Effect of the Proposed Method

150mm

Deformed Bar diameter:13

200mm

Circular spiral coil

AC power supply

Fig. 8. Specimens(column)

(a)S-A5-F500

(b)S-A10.5-F500

(c)S-A0-F0

Fig. 9. Corrosion Characteristics of rebars of each specimens

Average corrosion rate(%)

0 0.2 0.4 0.6 0.8

71% 83%

S-A5-F500 S-A10-F500 S-A0-F0

Fig. 10. Average corrosion rate of each specimens

The corrosion condition of the iron reinforcement after the experiment is shown in Fig.9. Compared to the test specimen S-A0-F0 without electromagnetic induction, the test specimens S-A5-F500 and S-A10-F500, where electromagnetic induction was applied, exhibited less corrosion product formation. The average corrosion rate and corrosion reduction rate for each test specimen are shown in Fig.10. The average corrosion rate for the test specimens S-A5-F500 and S-A10-F500, with electromagnetic induction applied, was 0.08% and 0.05%, respectively, which is smaller than the corrosion rate of 0.26% for the test specimen without electromagnetic induction. Furthermore, the corrosion reduction rates for both test specimens were 71% and 83%, respectively, indicating that higher current