Corrosion Resistance of Cu-15Ni-8Sn Alloy in Seawater

The corrosion behavior of a copper-nickel-tin alloy exposed to artificial seawater was investigated by metallographic microstructure observation, electrochemical impedance spectroscopy uscopy (EIS) tests, scanning electron microscopy and energy dispersive spectrometer analysis. The results showed that there was a complex passivation process after the Cu-15Ni-8Sn alloy immersed in seawater, layered corrosion products formed on the surface, and then the corrosion resistance became long-term stabile. An internal compact passivation layer of nickel and tin improved the corrosion resistance of this alloy significantly.