The Pitting Susceptibility Investigation of Passive Films Formed on X70, X80, and X100 Pipeline Steels by Electrochemical Noise and Mott-Schottky Measurements

Figure 13

SEM images of corrosion morphology of passive films for X70, X80, and X100 pipeline steels after the electrochemical noise measurement for 1 h in 3.5 wt.% NaCl solution (a) and (b) X70 steel; (c) and (d) X80 steel; (e) and (f) X100 steel.