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In order to improve corrosion resistance of 2024 aluminum alloy, a preferential removal of CuAl2 intermetallic compound particles on the alloy surface has been studied in trail and error. One of the preferable electrochemical conditions for the CuAl2 preferential removal treatment was a cathodic current density of-2 kAm-2 in a 30 massH2SO4 solution for the period of 300 s. By the above treatment, it is shown that the surface with free CuAl2particles has morphologically and electrochemically performed corrosionresistant characteristics. The zinc plating on aluminum alloy makes an effective surface modification to obtain 2024 improved corrosion resistant characteristics.

Improvement of Corrosion Resistance of 2024 Aluminum Alloy by Preferential Removal of CuAl2 System Intermetallic Phases and Zinc Plating