Effect of Cu Addition on the Electrochemical Corrosion Performance of Ni3Al in 1.0 M H2SO4
Advances in Materials Science and Engineering(2015)
摘要
The effect of Cu addition on the electrochemical corrosion behavior of Ni 3 Al intermetallic alloy was investigated by potentiodynamic polarization, open-circuit potential, linear polarization resistance, and electrochemical impedance spectroscopy in 1.0 M H 2 SO 4 solution. Performance of the pure elements (Cu, Ni, and Al) was also evaluated. In general, Cu addition improved the corrosion resistance of Ni 3 Al. Electrochemical measurements show that corrosion resistance of Ni 3 Al-1Cu alloy is lower than that of other intermetallic alloys and pure elements (Ni, Cu, and Al) in 1.0 M H 2 SO 4 solution at 25°C. Surface analysis showed that the Ni 3 Al alloys are attacked mainly through the dendritic phases, and Cu addition suppresses the density of dendritic phases.
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关键词
electrochemical corrosion performance,cu addition,ni<sub>3</sub>al
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