Effects of strain rate on stress corrosion cracking of X80 pipeline steel in ku'erle soil environment

Slow strain rate testing (SSRT), potention dynamic polarization curves and scanning electron microscope (SEM) were employed to study the stress corrosion cracking (SCC) behavior of X80 pipeline steel in Ku'erle soil simulated solution. The results showed that the corrosion rate of X80 steel first increased and then decreased with the increase of strain rate. When the strain rate was 5×10^-7/s, the corrosion phenomenon of X80 steel was not obvious. At this time. electrochemical corrosion played a decisive role. When the strain rate was 5×10^-6/s, the corrosion behavior of X80 steel was the most serious. This is due to the combined effects of electrochemical and mechanical on the electrode surface, solution. which the mechanical action was dominating role.