Corrosion resistance and adsorption behavior of bis-(γ-triethoxysilylpropyl)-tetrasulfide self-assembled membrane on 6061 aluminum alloy

Abstract

A bis-(γ-triethoxysilylpropyl)-tetrasulfide (BTESPT) self-assembled membrane (SAM) was prepared by self-assembly membrane technology on 6061 aluminum alloy. The SAM was evaluated using electrochemical techniques (potentiodynamic polarization and electrochemical impedance) in 3.5 wt% NaCl solution. In addition, molecular dynamics calculations showed a high binding energy between the self-assembled molecule and aluminum alloy surface. The formation of the self-assembled molecule was believed to be achieved by a chemical bond between the silicon oxide group and the metal surface atoms. Finally, X-ray photoelectron spectroscopy and scanning electron microscopy were carried out to confirm that BTESPT could form a membrane on 6061 aluminum alloy.