Green Extract of Mate Tea as Corrosion Inhibitor of Copper and Aluminum

MÉNDEZ, CLAUDIA M.; ARES, ALICIA E.; DERNA, ANA M.; GASSA, LILIANA M.

The Minerals, Metals and Materials Series

Springer

Año: 2017 p. 135 - 144

2367-1181

Many of the corrosion inhibitors in current use are expensive and toxic so the current trend is to study compounds that are environmentally friendly and efficient. Inhibitors are easy to use and they have the additional advantage that can be applied in situ and without causing signifficant disruption in the process. In the present work we investigate the influence of the aqueous extract of yerba mate as corrosion inhibitor of copper and aluminium in 0.5 M NaCl and 1 M HCl solutions, using different electrochemical techniques. The following inhibition efficciences: 56% for copper in 0.5 M with 25% cocentration of extract, 17% for copper in 1 M HCl with 5% concentration of extract, and 99% for aluminium in 0.5 M NaCl for 1% concentration of extract were obtainde by potentiodynamic polarization.