Research Article

New Mechanism on Synergistic Effect of Nitrite and Triethanolamine Addition on the Corrosion of Ductile Cast Iron

Figure 12

Effect of addition sequence of corrosion inhibitors (N: ppm , T: ppm TEA) on AC impedance of the passive film that was formed at 0 V (SCE) in deaerated tap water at 25°C. (a) Nyquist plot. (b) .
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(b)