Abstract
In this study, electrochemical impedance spectroscopy (EIS) technique was used to investigate the development of stress corrosion cracking (SCC) in X70 pipeline steels. Slow strain rate testing (SSRT) was performed on steel samples in high pH bicarbonate solution. Potentiostatic EIS tests were also conducted regularly to determine the changes associated with the SCC. The Bode modulus and phase diagrams for cracks were calculated. Furthermore, the suitable frequency window for detection of the cracks by EIS was determined. Finally, a circuit model proposed for the cracking.
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