采用复合电沉积法制备出新型的Cu-30Ni-20Cr纳米复合镀层.该镀层的组织结构与常规Cu-Ni-Cr三元合金不同,是由Cu-Ni基固溶体(晶粒尺寸约为60 nm)和纳米Cr颗粒(平均尺寸约为28 nm)组成.与相同工艺条件下制备的Cu-40Ni合金镀层相比,Cu-30Ni-20Cr纳米复合镀层在800℃空气中的氧化速率显著降低,这是由于它能迅速形成一层连续、致密的Cr2O3膜所致.对Cr颗粒在Cu-30Ni-20Cr纳米复合镀层的高温氧化过程中所起的作用进行了讨论.
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