Corrosion characteristic of Cu-10Ni-Fex in 3.5 % NaCl

Abstract

The corrosion charateristic of Cu-10Ni-Fex alloys (x=0.84, 1.26, 1.76) in 3.5 % NaCl solution was investigated by using electrochemical impedance spectroscopy, potentiodynamic polarization curve, X-ray Diffraction and X-ray photoelectron spectroscopy. The results showed that the order of corrosion resistance is Cu-10.52Ni-1.26Fe > Cu-10.44Ni-0.84Fe > Cu-10.48Ni-1.76Fe. Fe exists in the form of FeOOH and FeO in the product films, whilst Ni exists in the form of NiO, Ni(OH)2, and metallic Ni in the product films. FeOOH promotes the enrichment of the Ni content and the formation of NiO. The product film of Cu-10.52Ni-1.26Fe with the best corrosion resistance contained the highest content of FeOOH. In addition, the mechanism of FeOOH on the corrosion resistance has been discussed.