Abstract
Minor M (M = Fe, Mn, Cr) additions are widely added to enhance the corrosion resistance of commercial cupronickel alloys. The present paper aims at optimizing the amounts of M in Cu 70(Ni,Fe,Mn,Cr) 30 (at.%) alloys using a cluster-plus-glue-atom model for stable solid solutions. By this model, it assumed that 1 M atom and 12 Ni atoms formed an M-centered and Ni-surrounded cube-octahedron cluster and the isolated M 1Ni 12 clusters are embedded in a Cu matrix, conforming to a cluster formula [M 1Ni 12]Cu 30.3 = [M 1/13Ni 12/13] 30Cu 70. A structure of this kind satisfies ideally the nearest neighbor requirement, i.e. only M–Ni and Ni–Cu neighbors are allowed and the unfavorable Cu–M pairs are avoided, and hence it describes a stable solid solution structure with good thermal stability. Electrochemical corrosion measurements indicated that [(Fe 0.6Mn 0.25Cr 0.15) 1Ni 12]Cu 30.3 had the best corrosion resistance in 3.5% NaCl aqueous solution.
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