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研究了三元双相Cu-20Ni-25Co合金在600,700℃、0.1MPa纯氧气中的氧化行为。结果表明:合金的氧化动力学不规则且偏离抛物线规律,氧化动力学曲线由3段抛物线段组成。前期研究的二元双相Cu-25Co合金经过了较长时间的氧化后合金表面未能形成活泼组元Co的选择性外氧化,而本研究的Cu-20Ni-25Co合金表面氧化膜外层主要是由CuO组成,紧接着是Co的氧化物层。可见,向Cu-25Co合金中加入Ni后,降低了合金表面形成活泼组元Co外氧化膜所需的临界浓度,促使合金表面在较低Co含量下能形成活泼组元Co的外氧化膜。
The oxidation behavior of ternary binary Cu-20Ni-25Co alloy at 600, 700 ℃ and 0.1MPa pure oxygen was studied. The results show that the oxidation kinetics of the alloy is irregular and deviates from the parabolic law, and the oxidation kinetic curve consists of three parabolic segments. In the previous study, the binary Biphase Cu-25Co alloy failed to form a selective extrinsic oxidation of Co with active component after a long period of oxidation. However, the outer layer of the oxide film on the surface of Cu-20Ni-25Co alloy was mainly Is composed of CuO, followed by Co oxide layer. It can be seen that the addition of Ni to the Cu-25Co alloy decreases the critical concentration required for the formation of an active oxide Co outer oxide film on the alloy surface and promotes the formation of an active oxide film of Co at the lower Co content.