Preparation of Polystyrene Film on 2519 Al Alloy and Its Corrosion Protection
In order to improve the corrosion resistance of 2519 Al alloy, a thin layer of polystyrene(PS) film was prepared on its surface. Scanning electron microscope(SEM) and energy dispersive X-ray analysis(EDS) were used to observe the surface morphology and analyze elemental of the film. The corrosion protection properties of the film and the corrosion process of the samples were investigated by electrochemical polarization test and electrochemical impedance spectroscopy(EIS). The corrosion current density of the pretreated sample is one order of magnitude lower than that of bare sample and the corrosion potential positively shifts about 20 mV.