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研究了 3种不同Co含量双相Cu Co合金在 60 0～ 80 0℃空气中的氧化行为 .合金氧化动力学遵循抛物线规律 ,并且在同一温度下抛物线速率常数随Co含量升高而降低 .所有合金均形成由Cu和Co氧化物的复杂混合物组成的复合氧化膜 ,其中Cu的氧化物倾向于集中在膜的外层 .通常在外层膜下 ,是Co的氧化物和金属Cu的混合区 ;对于Co含量低于 50 % (质量分数 ,下同 )的合金 ,这就是Co的内氧化区 ;而对含 75 %Co的合金则是在Co氧化物的基体上分布着孤立的Cu颗粒 .与固溶体二元合金不同的是 ,在这一区域下面的合金基体没出现Co的贫化 .基于合金显微组织的双相特征 ,对合金氧化膜的特殊结构进行讨论 .
The oxidation behavior of three different Co-content dual-phase Cu-Co alloys in the air at 60 0 ~ 80 0 ℃ was studied.The oxidation kinetics of the alloy follows the parabolic law and the parabolic rate constant decreases with the increase of Co at all temperatures The alloys each form a composite oxide film consisting of a complex mixture of Cu and Co oxides, where the oxide of Cu tends to concentrate on the outer layer of the film, typically a mixed zone of Co oxide and metallic Cu under the outer film, For the Co content less than 50% (mass fraction, the same below) of the alloy, which is the internal oxidation of Co; and for the alloy containing 75% Co oxide Co is deposited on the matrix of isolated Cu particles. In solid solution binary alloys, the Co-depleted alloy matrix does not appear in this region, and the special structure of the alloy oxide film is discussed based on the bi-phase characteristics of the alloy microstructure.