Cyclic Wet-dry Immersion Corrosion Behavior of Aluminum Alloy 1050A in Simulated Marine Atmospheric Environment

The corrosion behavior of aluminum alloy 1050A in marine atmospheric environment was studied by cyclic wet-dry immersion test. Electrochemical impedance spectroscopy (EIS), weight loss method,scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) were employed to observe and analyze the surface morphology, structure and composition of the corrosion products of aluminum alloy 1050A in simulated marine atmosphere. The results showed that the corrosion product increased, mass loss increased and the resistance value gradually decreased with testing time prolonging. Surface observation revealed that the corrosion product was accidented and agglomerated. The corrosion products mainly include aluminum chloride, Al2O3, Al(OH)3 and AlO(OH). Electrochemical impedance spectroscopy fitting results show that the corrosion rate first increased and then decreased.