Figure 7: SL-EPR polarization curves of steel (cooling rate: 0.3 K/s) obtained in 0.5 M H₂SO₄ + 0.01 M KSCN + 0.5 M NaCl solutions without (a: SL-EPR(1)) and with (b: SL-EPR(2)) 0.3 V holding for 300 s.