In-depth insight into the synergistic inhibition mechanism of S-benzyl-L-cysteine and thiourea on the corrosion of carbon steel in the CO2-saturated oilfield produced water

Abstract

Mixing is an effective strategy to improve the inhibition performance of corrosion inhibitors based on their synergistic effect. In this work, the synergistic inhibition effect of S-benzyl-L-cysteine (SBLC) and thiourea (TU) on the corrosion of carbon steel in the CO2-saturated oilfield produced water is studied by electrochemical tests and surface analysis. It is found that SBLC and TU exhibit a significant synergistic corrosion inhibition effect. Meanwhile, the synergistic mechanism is in-depth elucidated by theoretical calculations. The intermolecular interaction between SBLC and TU molecules leads to the formation of a more compact and stronger adsorbed film on carbon steel surface.