In this study, montmorillonite organoclay (OMMT) at various concentrations were tested as nanofillers in preparation of UV-cured DGEBA epoxy anticorrosive coatings and applied on carbon steel substrates. The effect of incorporating different compositions of OMMT in UV-cured Araldite 506 coatings on the aqueous corrosion resistance of carbon steel in 5 wt-% aqueous NaCl electrolyte was evaluated. Analysis showed that the OMMT was homogenously dispersed in the polymer matrix. The result of X-ray diffraction showed that a certain degree of intercalation occurred for the OMMT in the polymer matrix. The OMMT addition affects the UV cured of the Araldite 506, as evidenced by Fourier transform infrared spectroscopy. The anticorrosive properties were evaluated by electrochemical impedance spectroscopy at various exposure periods. Coatings with 3 wt-% OMMT possessed the best corrosion performance among the coating specimens. In fact, the NC3 coating provided corrosion protection properties even after a long exposure to NaCl solution.
The paper studies the effect of incorporating graphene oxide (GO) without surface functionalization on a commercial epoxy resin. GO was dispersed in a commercial epoxy resin at concentrations of 0 wt.%, 0.1 wt.%, 0.5 wt.%, 1 wt.%, and 3 wt.%. The resultant materials were deposited on carbon steel substrates, followed by the use of a 5 wt.% aqueous NaCl electrolyte, to evaluate the effectiveness of their anticorrosive coating function. Scanning electron microscopy (SEM) analysis showed that the GO was homogenously dispersed in the polymer matrix, resulting in flat and smooth surfaces. The X-ray diffraction (XRD) results showed that although GO was highly dispersed in the polymer matrix, multilayer graphene was also obtained after curing. The anticorrosive properties were evaluated by electrochemical impedance spectroscopy (EIS) at various exposure periods. Analysis of the prepared samples indicated that the best anticorrosion performance among them was available with the 0.5 wt.% GO coating. The obtained results indicate that GO–polymer matrix composites provide improved corrosion protection properties even after 500 h exposure to the NaCl solution.
Los residuos de mina generan grandes cantidades de elementos potencialmente tóxicos (EPT), entre los que encontramos al plomo (Pb) y al arsénico (As), que causan daños importantes al medio ambiente y a la salud humana. El estudio de estos EPT normalmente se realiza sobre la cantidad total presente en el suelo, pero no así en su distribución. El análisis de la redistribución del Pb y As con bacterias promotoras de crecimiento vegetal (BPCV) indica que se hacen menos biodisponibles y se redistribuyen en las fracciones de materia orgánica y residual con diferencias significativas (p < 0.05). Estos resultados muestran una estabilización de los EPT y, por consiguiente, una reducción en el riesgo al medio ambiente y a la salud humana.
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