Comprehending of the reverse effect of Cl− concentration and fluid flow on pitting corrosion of carbon steel

Abstract

Corrosion behavior (especially pitting) of AISI-1020 carbon steel in the saturated CO2 solutions containing high concentrations of Cl− was evaluated under static and dynamic conditions at 60 °C. Results reveal a reverse effect of Cl− concentration and fluid flow on pitting, in which a synergistic effect between an adequate concentration of Cl− and fluid flow can promote initiation and propagation of pitting corrosion of carbon steel. In comparison, pitting behavior has been obviously limited at an extremely low surface coverage ratio caused by a combined action of an excessive concentration of Cl− and fluid flow.