The corrosion processes of 2A12, 5A06 and 7A04 aluminium alloy in neutral and acid (pH≈5) continuous salt spray environment were studied with weight loss method and electrochemical method. The morphology and surface condition in the interface of metal phase was studied by metallographic microscope and contact angle surface analyzer, and the corrosion mechanism was analyzed. Weight loss method, polarization curves by Tafel extrapolation and electrochemical impedance spectroscopy show that the 3 kinds of aluminum alloy have the relationship of corrosion rate 7A04>2A12>5A06 in neutral salt spray as well as 7A04> 5A06>2A12 in acidic salt spray. The contact angles of the aluminum alloys surface with neutral and acidic salt solution conditions are 70.9ånd 52.6°respectively. The reason why the contact angle with acid salt solution is smaller than that with neutral salt solution is probably that the increase of the hydrogen ions may cause the cathodic reaction to move to the right, accelerate anodic dissolution and destroy the oxide film on the surface of the aluminum alloy.
Corrosion Electrochemistry of Aluminum Alloy for Aviation in Acid Salt Spray Environment
2017
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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