Nyquist plots obtained for a UNS G10180 over time exposed to CaCO3-saturated solution (160 ppm Ca2+) at 80°C, pCO2 0.53 bar, bulk solution pH 6.2, 0.18 M ionic strength, and 20 rpm: (a) active corrosion period and (b) nucleation/growth of corrosion products and pseudo-passivation periods.