Inhibition of the localised corrosion of AA2024 in chloride solution by 2-mercaptobenzimidazole and octylphosphonic acid

Abstract The scanning vibrating electrode technique was employed to monitor the in situ localised electrochemical activity on aluminium alloy 2024-T3 at free corrosion potential aggressive NaCl solutions with and without inhibitors 2-mercaptobenzimidazole (MBI) octylphosphonic acid (OPA). MBI is a very effective inhibitor against pitting corrosion, even chloride environment reservoir of MBI. In contrast, observed several points early stage immersion AA2024 solution containing OPA. Ex energy-dispersive X-ray spectroscopy analysis Al 2 CuMg particle cross-section revealed that does not entirely prevent its dissolution but reduces rate oxygen reduction by forming an insoluble complex compound Cu–MBI partially dealloyed AlCu-based particles, i.e., porous copper remnants. MBI’s action efficient option for mitigating Cu-based alloys.