Abstract
The corrosion behavior of Cu–20Co–30Cr alloys with different grain size was investigated at 700–900°C in 0.1MPa pure oxygen. The corrosion rates of fine-grained MACu–20Co–30Cr alloy are significantly lower than those of coarse-grained PMCu–20Co–30Cr alloy. PMCu–20Co–30Cr alloy forms the external scales of Cu oxides followed by an internal oxidation region containing alloy and a mixture of Cu, Co and Cr oxides as well as their complex oxides. MACu–20Co–30Cr alloy forms the continuous scales of chromia and a Cr-depleted layer occurs beneath the scales. The grain refinement is helpful to form the continuous scales of chromia in a Cu–Co–Cr alloy.
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