A Ag/4.0 mass%Cr203 composite film was fabricated on Cu substrate for application as electric contact through a two-step process： prior fabrication of a Ag/2.4Cr composite coating through co-electrodeposition of Ag with Cr nanoparticles （mean size： 30 nm） and then oxidation at 500℃ in air. The results showed that the Cr particles in the Ag/2.4Cr composite coating were locally and diffusionlessly oxidized. Compared to the conventional Ag/MexOy type electric contacts （such as Ag/12CdO） fabricated by internal oxidation of the corresponding Ag-Me alloys （e.g., Ag-10.5Cd） reported, the Ag/4.0Cr2O3 composite film has similar density and electrical resistivity, but a higher hardness.
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