Corrosion Behavior Study Of Typical Aluminum Alloy In Simulated Marine Atmospheric Environment

The corrosion behavior of the aluminum alloy1050A in marine atmosphere wasinvestigated by means of cyclic wet-dry immersion test and salt fog test. Mass lossmethod such as electrochemical impedance spectroscopy (EIS) and potentiodynamicpolarization curve as well as electrochemical techniques under the background of theatmospheric environment. We are used to observe and analyze relativity concerningkinetic laws, the surface of corrosion morphology, electrochemical laws for1050Aaluminum alloy this dissertation.In the initial stages of cyclic wet-dry immersion test, with testing hoursprolonging, mass loss increasing and the resistance value gradually decreasing. Thepitting for the aluminum alloy1050A was the main corrosion form with corrosiontime. When NaCl were deposited on the surface of the aluminum alloy1050A, thecorrosion mass gain of the aluminum alloy1050A became larger. The correlationbetween mass loss and corrosion time for aluminum alloy1050A accorded withexponential rule as C=Atn. Strength, elongation percentage and resistance of thealuminum alloy1050A declined with increasing of corrosion time. The corrosionproducts formed on the sample surface were discontinuous, agglomerate andaccidented. The corrosion product contained aluminum chloride, Al2O3, Al(OH)3,AlO(OH). Surface observation revealed that the corrosion product was accidentedand agglomerated; The SEM morphology showed that the aluminum all oys weredissolved at local region.In the initial stages of salt fog test, the pitting for the aluminum alloy1050A wasthe main corrosion form. The pitting appeared around the secondary phase particlesfirstly. Cl-could accelerate the corrosion of aluminum alloy. The corrosion productsformed on the sample surface were discontinuous, agglomerate and accidented. Thecorrosion product contained Al2O3, Al(OH)3, AlO(OH).The correlation between massgain and corrosion time accorded with exponential rule as C(t)=Atb. The results ofEIS showed that the corrosion resistance of aluminum alloy1050A decreased with thetest time increasing.