Horse-chestnut ethanolic extract was tested as potential corrosion inhibitor of bronze in
simulated acid rain. The extract was analysed by FTIR, GC-MS and HPLC-PDA, and its anti
corrosion behaviour studied using a multiscale electrochemical approach (polarization curves,
EIS and scanning electrochemical microscopy), along with SEM-EDS. 94% inhibition efficiency
was attained by developing a surface physisorbed film. A novel methodology for kinetic
evaluation of dynamic adsorption of inhibitive species on metal surface is proposed using
SECM, achieving good agreement with results from conventional electrochemical techniques.
Excellent adsorption-desorption kinetic constants (ka = 0.102 s-1 mol-1 L; kd = 3.33x10-5 s-1) were
determined
