Thyssen Stahl Ag

Usinor-sacilor Societe Anonyme

Jean-Claude Catonne

Christian Allely

Gerard D Raisson

Yann Breviere

Eric Jolivet

Herv&eacute; Lavelaine

Remy Nicolle

Both a process and plant are provided for electrolytically coating with a metal layer the casting surface of a roll for twin-roll or single-roll continuous casting of thin metal strip. The casting surface is at least partially immersed in an electrolyte solution containing a salt of the metal to be deposited, so as to face at least one anode. The surface is placed at a cathode and a relative movement is created between the casting surface and the electrolyte solution. Insulating masks are interposed between the anode or anodes and the arrises of the casting surface, the insulating masks preventing a concentration of the lines of current on the arrises and in their vicinity.

Process and plant for electrolytically coating surface of a roll, for the continuous casting of thin metal strip, with a metal laser

The subject of the invention is a process for conditioning the copper or copper-alloy external surface of an element of a mold for the continuous casting of metals, of the type including a step of nickel plating of said surface and a step of nickel removal therefrom, wherein: a preparation of said surface, comprising in succession an operation of cleaning said bare surface, an operation of pickling said bare surface in an oxidizing acid medium and an operation of brightening said bare surface, is carried out; then, an operation of nickel plating of said bare surface is carried out by electroplating, by placing said element as the cathode in an electrolyte consisting of an aqueous nickel sulfamate solution containing from 60 to 100 g/l of nickel; then, after said element has been used, an operation of partially or completely removing the nickel from said surface electrolytically is carried out, by placing said element as the anode in an electrolyte consisting of an aqueous nickel sulfamate solution containing from 60 to 100 g/l of nickel and sulfamic acid in an amount from 20 to 80 g/l, and the pH of which is less than or equal to 2; and then a new nickel plating of said surface is carried out, if appropriate preceded by a preparation of the surface of the bared copper as explained previously.

Process for conditioning the copper or copper-alloy external surface of

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La Celle St. Cloud, France

Jean-Claude Catonne