The effect of additions of iron on the corrosion behaviour of a 70Cu–30Ni alloy in sea water was studied by electrochemical methods and corrosion tests. Iron additions of 0·5 and 2% increased the average corrosion resistance of the alloy. This beneficial effect is due to the formation of a layer containing a large quantity of nickel and iron oxides. A disadvantage of iron additions is the possibility of pit and crevice formation as a result of segregation of nickel-iron rich precipitates at grain boundaries.
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Beccaria et al. (1991) studied this question.
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