Abstract: A roller electrode, to be used for the support of sheet-metal strips in an electrorefining bath, has a hollow-cylindrical steel body spacedly surrounded by steel tubing for the circulation of a cooling fluid. A thin-walled shell of steel or nickel alloy, spacedly enveloping the tubing, defines with the roller body an annular space filled with a mass of lower-melting metal such as copper in which the tubing is embedded. The shell may extend partly around two stub shafts extending integral with the roller body at opposite ends therefrom. In making the electrode, the shell is heated above the melting point of the lower-melting metal which is then introduced in a molten state into the space containing the tubing where it is allowed to harden.

Abstract: A roller for the continuous electrolytic processing of metallic or metallized strip materials which is a good electrical conductor is provided with a circuit for cooling fluid. It has two forged flanges each defining a hollow half shaft along a common longitudinal axis. The two flanges are made fast to the respective ends of a hollow cylindrical body. Proceding from the outer cylindrical surface of the assembly of the flanges and of the body there are provided successively radially outwards from said surface: a continuous layer of uniform thickness of a corrosion-resistant metal, a continuous layer of a metal which is a good conductor of electricity with constant cross-section for the passage of electric current, the zone of the face of the roller being also provided with an outer coating of a hard metal. The flanges may have an internal cup shape. A cooling liquid can flow through the hollow shafts.