日本金属学会誌

J. Japan Inst. Metals, Vol. 70, No. 7 (2006),
pp. 525-533

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

Osami Seri and Fumiaki Hirose

Department of Mechanical System Engineering, Muroran Institute of Technology, Muroran 050-8585

Abstract:

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 mass%H2SO4 solution for the period of 300 s. By the above treatment, it is shown that the surface with free CuAl2-particles has morphologically and electrochemically performed corrosion-resistant characteristics. The zinc plating on aluminum alloy makes an effective surface modification to obtain 2024 improved corrosion resistant characteristics.


(Received 2006/2/8)

Keywords:

preferential removal, aluminum-copper intermetallic compound, zinc plating, electrochemical measurement


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