Electrochemical Analysis of a Rust Converter Applied on Materials of Historical Interest

摘要

The use of chemical formulations as oxide converters has been a protection, however, these formulations cause contamination, the use of converters based on plant extracts is an alternative. In the present investigation, an extract of Mimosa Tenuiflora, was developed as a protection alternative, which was applied as a rust converter in 1018 steel plates with corrosion products as an alternative for the conservation of ferrous alloys. Linear Polarization Resistance (LPR) and Electrochemical Impedance Spectroscopy (EIS) were the electrochemical techniques used and morphological characterization were made by Scanning Electron Microscopy (SEM/EDS) and X Ray Diffraction (XRD). Oxides formed in shorter exposure time react better than oxides formed in longer exposure time, due to the results of superficial characterization and literature, the lepidocrocite works better with a rust converter. Whereas the goethite takes longer to react, the kinetics of the system corrosion process is dominated by a Warburg type diffusion process, this is concluded by EIS.