Assessment of Mimosa Tenuiflora Extract as Rust Converter for the Protection of Historical Heritage Metallic Materials

Tannic extract of the Mimosa Tenuiflora was assessed as a rust converter using Electrochemical Impedance Spectroscopy (EIS) and Linear Polarization Resistance (LPR) techniques. The tannic extract was applied on pre-corroded AISI 1018 steel plates before a commercial epoxy coating. Four different specimens were prepared and submerged in two solutions, 0.51 M NaCl and 0.1 M Na2SO4. All systems were inspected for 40 days in search of changes in the coatings. The exposure time and the reaction time of the rust converter are important factors to obtain good performance.