Sherardizing

sherardizing, means of forming a uniform, corrosion-resistant coating of zinc on the surface of iron or steel objects. The process, practiced since about 1900, is named for its English inventor Sherard O. Cowper-Coles. The object is heated in a sealed container with finely divided zinc to a temperature below the point at which zinc melts. The two metals amalgamate, forming alloys of zinc and iron and an external layer of pure zinc in an adherent coating that resists corrosion and also makes an excellent base for paint. Compare galvanizing.