Stress Corrosion Cracking of X80 Steel in Alkaline Environment

The stress corrosion cracking (SCC) susceptibility of X80 steel in an alkaline soil environment was investigated using electrochemical polarization, slow strain rate testing (SSRT) and SEM. The effect of cathodic potential on SCC was studied. The results showed that X80 steel was susceptible to SCC in the present solution. The SCC behavior was affected by cathodic potentials obviously. The cathodic reaction restricted the SCC at the potential of -850 mV (vs.SCE). At more negative potentials of -950 mV and -1 050 mV (vs.SCE), the SCC behavior was controlled by the combined effect of anodic dissolution and hydrogen. When the cathodic potential was negatively shifted, the hydrogen played a more and more important role.