Yerba mate extract in anticorrosive paints to protect SAE 1010 steel

Y. SILVESTRI; S. ROSELLI; R.ROMAGNOLI; M. C. DEYA

CABA

Congreso; LATINCORR; 2018

The aim of this work was to formulate, prepare and test epoxy water-borne paint with yerba mate (Ilex paraguariensis) extract. In order to concentrate the extract, after 24 h of stirring the yerba mate leaves in distilled water, the supernatant was heated up to 75ºC for 15 min in a rotavapor. The concentrated extract was dried in laboratory conditions overnight.The anticorrosive paint was fomulated with an epoxypoliamidoamine resin, and talc, titanium dioxide, barite and mica as complementary pigments. The solvent employed was water; no anticorrosive pigment was incorporated. Three paints were prepared: one, the control, without extract, one with diluted extract and the other one with the concentrated extract.To determine the paint?s performance, painted SAE 1010 steel panels were painted up to a dried film thickness of 70 ± 10 m. After 15 days curing, the panels were evaluated by aging accelerated tests (salt spray chamber) and electrochemical techniques (corrosion potential and ionic resistance).Results were good with the dilute extract. However, the incorporation of the concentrated extract affects film formation; volcano structures with extract rests on the eye appeared.