The Dealloying of Copper‐Manganese Alloys

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Abstract
Binary copper alloys containing 25 and 50% manganese were corroded in sodium chloride solution at various fixed potentials spanning their corrosion potential. Both Cu‐Mn alloys exhibited dealloying at a high rate. The Cu‐25%Mn alloy exhibited dealloying behavior similar to that observed in the Cu‐Zn and Cu‐Ni systems. Selective loss of manganese was maximized at the most active potential at which the alloy was held. When the potential was raised some 0.25V above the corrosion potential, dealloying was largely prevented. The Cu‐50%Mn alloy exhibited different behavior with very pronounced dealloying occurring over the whole potential range studied. The morphology and composition of the dealloyed residues was also investigated in detail. The mechanism of dealloying in the Cu‐Mn system is discussed.

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