Fig. 5

Open circuit measurements (a), Nyquist plots (b) for copper after 3 days of immersion in 0.6 M NaCl in the absence and presence of 60 ppm of nBF, ME, and QF, (c, d) Nyquist plots for copper at different time of immersion in 0.6 M NaCl solution, and 0.6 M NaCl solution containing 60 ppm of nBF, respectively.