Accelerated Corrosion Behaviors of Aluminum Alloy 2A12 in Simulated Coastal Industrial Atmosphere Environment

Salt spray experiment, weight loss method, SEM, EDS and electrochemical analysis were used to study the accelerated corrosion behavior of electrician aluminum alloy 2A12 in simulated coastal industrial atmosphere with 0.2% NaHSO₃+5% NaCl and 0.4% Na₂S₂O₈+5% NaCl as corrosion media. The results show that the electrician aluminum alloy had obvious localized corrosion in the two corrosive salt sprays. Na₂S₂O₈ had a significant depolarization effect, so that the cathode current density increased, the content of AlCl₃ and sulfate in corrosion products increased. The stability of passivation film on the surface of aluminum alloy in 0.4% Na₂S₂O₈+5% NaCl was obviously reduced, the corrosion rate was increased, and a good accelerated corrosion effect could be obtained.