Self-assembled monolayers ( SAMs) of 1-Tetradecanethiol ( TDT) were prepared on the surfaces of 2024 aluminum alloys by immersing method in the TDT solutions using mixtures of absolute ethanol and water with different volume ratios as the solvents. The adsorption behavior and corrosion inhibition performance of TDT SAMs were investigated by potentiodynamic scanning, EIS ( electrochemical impedance spectrum) , AFM ( atomic force microscopy ) and XPS ( x-ray photoelectron spectroscopy) . The results indicate that TDT shows a certain inhibition effect on the corrosion of aluminum alloys in Harrison solution,and the inhibition efficiency increases with the increasing of water content in the assembly solution.