Corrosion mitigation of AA6082, Copper-ETP, and their galvanic couple using ▫$Ce(OAc)_{3}$▫, ▫$Na_{2}SO_{4}$▫, and 1H-BTA in chloride solutionTrdan, Uroš (Avtor) Logar, Andraž (Avtor) Klobčar, Damjan (Avtor) Milošev, Ingrid (Avtor) Kapun, Barbara (Avtor) Rodič, Peter (Avtor) AA6082Cu-ETPcorrosion inhibitioncerium acetatebenzotriazolegalvanic couplingGalvanic coupling between aluminium alloy 6082 and copper (Cu-ETP) accelerates corrosion through anodic dissolution of aluminium, posing serious durability challenges for mixed-metal structures. This study investigates the inhibition mechanisms of cerium acetate (▫$Ce(OAc)_{3}$▫), sodium sulphate (▫$Na_{2}SO_{4}$▫), and 1H-benzotriazole (1H-BTA), individually and in combination, on AA6082, Cu-ETP, and their galvanic couple in 0.1 M NaCl solution. The inhibitors’ performance was evaluated using potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and salt spray testing. ▫$Ce(OAc)_{3}$▫ and ▫$Na_{2}SO_{4}$▫ promoted the formation of cerium oxide films on AA6082, while 1H-BTA adsorbed on Cu-ETP, forming a compact film that suppressed anodic dissolution and cathodic oxygen reduction. The combined inhibitor system, compared to the uninhibited system, significantly reduced galvanic corrosion current by a factor ∼4.5 (▫$2.6μA/cm^{2}$▫ vs. ▫$11.8μA/cm^{2}$▫) and enhanced pitting resistance by shifting the pitting potential of AA6082 to more noble values. Furthermore, EIS results confirmed the improved stability of the passive films on Cu-ETP after 72 h of immersion in inhibitor mixture (▫$∣Z_{0.01 Hz}$▫∣ = 4.4 ▫$MΩcm^{2}$▫). SEM and salt spray results showed reduced corrosion and uniform protective deposits, with treated AA6082 retaining over 92% of its original volume after 42 days of exposure. This work demonstrates a synergistic inhibition strategy combining cerium salts and organic molecules to protect aluminium–copper assemblies in aggressive environments.20262026-01-07 11:29:29Članek v reviji177782sl