Abstract: A method for the production of metal foam with high specific surface area is disclosed. A foam material which may be either conductive or nonconductive is provided. If the material is nonconductive, an electrically conductive covering layer is formed. The electrically conductive foam material is then electrolytically coated with nickel from a nickel plating bath. The bath includes at least one unsaturated organic second class brightener in an amount effective to promote preferential growth of nickel onto the foam material such that the value of the growth ratio R, defined by the total of the growth of metal onto the foam material in the direction of the preferential growth divided by the total of the growth of metal in a direction perpendicular to the direction of the preferential growth, is greater than one. The nickel plating may be carried out using pulse current. The bath liquid may be flowed through the openings of the foam substrate in one or more directions during the deposition.

Abstract: A method for the production of a metal foam is described.To this end a suitable foam material (1)is provided, if necessary, with an electrically conducting covering layer (1') and then thickened by plating with metal in an electrolytic bath.According to the invention the electrolytic bath used contains a brightener; in particular a chemical compound having the properties of a second class brightener.Metal foam obtained by means of the method is also described.

Abstract: Metal screen comprising ribs and apertures and process of electrolytically forming a metal screen by forming in a first electrolytic bath a screen skeleton upon a matrix provided with a separating agent, such as beeswax, stripping the formed screen skeleton from the matrix and subjecting the screen skeleton to an electrolysis in a second electrolytic bath in order to deposit metal onto said skeleton. The second electrolytic bath contains an organic compound having at least one unsaturated bond not belonging to a ##STR1## group. Preferred organic compounds are a butyne diol or an ethylene cyanohydrin. The screen is preferably a cylindrical screen.