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Abstract
In order to improve corrosion resistance and bond durability of AA2024-T3 alloy, a bilayer silanisation film layer on the Al alloy was prepared from two kinds of silanes, bis(3-(triethoxysilyl)-propyl)tetrasulphide (BTSPS, bis-sulphur silane) and γ-glycidoxypropyltrimethoxysilane (GPTMS, epoxy functional silane), by a two step process in this work. The bilayer film was characterised with infrared spectroscopy and transmission electron microscope (TEM), and composition depth profiles were performed by Auger electron spectroscopy (AES). The corrosion resistance and bond durability of the Al alloy of the bilayer silanisation pretreatment were assessed with potentiodynamic scan (PDS) and electrochemical impedance spectroscopy (EIS) as well as a wedge test respectively. The analytical results show that the corrosion resistance and bond durability of Al alloy of the bilayer silanisation treatment are superior to those of GPTMS silanisation.
