Surface Alloying and Surface Compositing of Copper Alloys During Casting to Improve Corrosion Resistance, Wear Resistance, and Machinability

Abstract

Disclosed herein are corrosion resistant articles and methods of making the same. The articles include a cast copper alloy component, and a surface modified layer disposed on a surface of the cast copper alloy component, the surface modified layer comprising an surface modifying material selected from the group consisting of Cu, Ni, Cu—Ni, Cu—Sn, Al, Bi, Ni-coated graphite, Ni-coated Al2O3, Ni-coated SiC, uncoated graphite, uncoated SiC, uncoated Al2O3, and any combinations thereof. The methods disclosed herein include providing a slurry having a surface modifying material and a liquid binder. The method further comprises applying the slurry to an insulating tooling (e.g., a core, a mold, or both) to form a slurry-coated tooling, pouring molten copper alloy over the slurry-coated tooling to form a surface modified layer at the interface of the molten copper alloy and the slurry-coated tooling, and solidifying the molten copper alloy and surface modified layer.

Dependencies are inferred from the claim text.