| In the present study, tensile and corrosion properties of Cu-6Ni-2Mn-2Sn-2Al alloy, with and without Zr addition, were examined. Even though the addition of Zr refined the grain structure of Cu-6Ni-2Mn-2Sn-2Al alloy, the improvement in tensile property was not significant. The addition of Zr, however, greatly improved the corrosion resistance of the alloy in NaCl aqueous solution. The potentiodynamic study clearly demonstrated that the Zr addition substantially reduced the current density of Cu-6Ni-2Mn-2Sn-2Al alloy in 3.5% NaCl solution. The enhanced corrosion resistance with Zr appeared to be due to the reduced Sn segregation during solidification. The stress corrosion cracking study reflected the result of potentiodynamic study in the present study. The Zr-added specimen showed no reduction in tensile ductility after exposure to 3.5% NaCl aqueous solution for 20 days with an applied stress of 80% yield strength, while the tensile elongation of non-Zr added specimen was reduced approximately 10% after the exposure. The reduced Sn segregation during solidification in believed to be the main reason for the improved corrosion property of Zr-containing Cu-6Ni-2Mn-2Sn-2Al alloys. |
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