Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating substrate prior to coating
Patent
1997-04-11
1998-08-04
Gorgos, Kathryn L.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating substrate prior to coating
205151, 205181, 205191, 205206, 205207, 205215, 205219, 205271, 205272, 205273, 205274, C25D 534, C25D 704, C25D 512, C23C 2800
Patent
active
057888248
ABSTRACT:
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.
REFERENCES:
patent: 4264420 (1981-04-01), Tomaszewski
patent: 4502924 (1985-03-01), Minami et al.
patent: 4554049 (1985-11-01), Bastenbeck
International Search Report Mar. 12, 1996.
Marti et al., "Hardness of Sulfamate Nickel Deposits", Plating, pp. 377-385, Apr. 1969.
Allely Christian
Catonne Jean-Claude
Nicolle Remy
Raisson Gerard
Cole Thomas W.
Gorgos Kathryn L.
Thyssen Stahl Aktiengesellschaft
Usinor Sacilor (Societe Anonyme)
Wong Edna
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