Corrosion inhibition behavior of X80 pipeline steel by imidazoline derivative in the CO2-saturated seawater containing sulfate-reducing bacteria with organic carbon starvation

In this work, corrosion inhibition of steel caused by imidazoline derivative in the presence of sulfate-reducing bacteria (SRB) with organic carbon starvation was investigated in CO2-saturated seawater. Results demonstrate that the corrosion is inhibited by SRB with a high initial count in the absence of organic carbon but it is accelerated when the initial SRB counts decrease. The maximum value of corrosion rate caused by SRB is (0.179 ± 0.003) mm/y. The inhibition efficiency of imidazoline derivative is improved with a value of 76.2% after 14 days of testing when the initial SRB is 107 cells/mL.