Abstract

VIOMAR, Aline et al. Application of SAM in AA 2024-T3 aluminum alloy with alkaline degrease. Rem: Rev. Esc. Minas [online]. 2012, vol.65, n.1, pp. 93-98. ISSN 0370-4467.  http://dx.doi.org/10.1590/S0370-44672012000100013.

Self-assembly molecules (SAM - Self Assembly Monolayer) are corrosion inhibitors, due to their capacity to organize on surfaces, forming thin films. SAM presents a high affinity to aluminum oxide. However, the interactions between the oxide layer and SAM are not always satisfactory; therefore the oxide formed on the surface presents heterogeneities that hinder SAM film formation. The aim of this work was to study the corrosion protection of aluminum AA 2024-T3 associated with SAM, after treatment with alkaline degreasing. The electrochemical characterization was carried out by electrochemical impedance spectroscopy and anodic potentiodynamic polarization in Na₂SO₄ 0,5 mol.L^-1 in pH 4,0. The superficial morphology was investigated by optic microscopy. The results showed that SAM promoted greater aluminum protection when this was pretreated with degreasing.

Keywords : Aluminum alloy; self-assembly monolayers; corrosion.