Abstract

HERNANDEZ BARRIOS, Carlos Andrés et al. Synthesis, characterization and evaluation of porous hybrid sol-gel coatings doped with cerium acetate on the WE54-AE magnesium alloy. Iteckne [online]. 2013, vol.10, n.2, pp.249-258. ISSN 1692-1798.

The aim of the present work was the synthesis and characterization of silica-based hybrids coatings sol-gel doped with corrosion inhibitors (cerium acetate, 0.5% molar) on the WE54-AE magnesium alloy. The ageing time and the proportion of the crosslinking agent (3-aminopropyltrimethoxysilane, APTES) were modified to evaluate their influence on the sol-gel processing and the features of the coatings obtained. The sol evolution was monitored by infrared spectroscopy (FTIR) and viscosity measurements, while the sol-gel coatings were characterized by scanning electron microscopy (SEM-EDX). Further, corrosion resistance was evaluated by electrochemical testing in 0,1M NaCl solution. The results obtained showed that, in general, the sol-gel coatings were highly stable and provided an enhancement in corrosion resistance when compared to the uncoated alloy. In addition, the morphology of the coating resultant was substantially affected by the modification of either the ageing time or the APTES proportion. In this regard, under specific conditions, it was possible to obtain highly homogeneous and porous films, which are adequate to accommodate corrosion inhibitors.

Keywords : Magnesium; Corrosion; Coatings; Sol-gel.

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