Abstract An electropolished, copper plated, beryllium copper wire is plated with a composite coating of a nickel-iron-cobalt alloy. Such coating consists of a layer having a high anisotropic field parameter, of the order of 6 oersteds or higher, adjacent the surface of the wire, superimposed by a layer having a lower anisotropic field parameter, of the order of 4 oersteds or less. The wire is plated in two plating cells, the first of which is provided with a plurality of passages directing the flow of a plating electrode with a major component of flow across the wire and a minor component of flow in one direction along the wire. The second plating cell is provided with a plurality of passages directing the flow of a plating electrolyte substantially transverse to the wire. The electrolyte supplied to the first cell contains salts of iron, nickel and cobalt, with cobalt being present in a relatively high concentration. A similar electrolyte is supplied to the second cell except that its maximum concentration of cobalt is about one fifth of that of the first electrolyte.
A PLATING CELL FOR PLATING MAGNETIC MEMORY STORAGE WIRE COMPRISING: A NONCONDUCTING BODY HAVING A BORE THROUGH WHICH THE WIRE IS ADAPTED TO BE PASSED, A PLURALITY OF PASSAGES EXTENDING THROUGH SAID BODY, TRANSVERSE TO SAID BORE AND SPACED ALONG SAID BORE, THE AXES OF EACH OF SAID PASSAGES EACH BEING TILTED IN THE SAME DIRECTION FROM A PERPENDICULAR TO THE AXIS OF SAID BORE BY AN ANGLE OF BETWEEN 15* AND 30*, MEANNNS FOR INTRODUCING A FLOW OF PLATING ELECTROLYTE THROUGH SAID PASSAGES, AND MEANS FOR PASSING A PLATING CURRENT THROUGH SAID ELECTROLYTE TO A WIRE IN SAID BORE.
Claim 2
Dependent Claim
100 words
A PLATING CELL FOR PLATING MAGNETIC MEMORY STORAGE WIRE COMPRISING: A NONCONDUCTING BODY HAVING A BORE THROUGH WHICH THE WIRE IS ADAPTED TO BE PASSED, A PLURALITY OF PASSAGES EXTENDING THROUGH SAID BODY, TRANSVERSE TO SAID BORE AND SPACED ALONG SAID BORE, THE AXES OF EACH OF SAID PASSAGES EACH BEING TILTED IN THE SAME DIRECTION FROM A PERPENDICULAR TO THE AXIS OF SAID BORE BY AN ANGLE OF BETWEEN 15* AND 30*, MEANNNS FOR INTRODUCING A FLOW OF PLATING ELECTROLYTE THROUGH SAID PASSAGES, AND MEANS FOR PASSING A PLATING CURRENT THROUGH SAID ELECTROLYTE TO A WIRE IN SAID BORE.
Claim 3
Dependent Claim
88 words
In combination: a body having a bore; a plurality of passages extending through said body substantially transverse to said bore and spaced along said bore, the axis of at least one of said passages being tilted at an angle of between 15* and 30* with respect to a perpendicular to the axis of said bore; means for introducing a flow of plating electrolyte through said passages; means for passing an elongated body to be plated through said bore; and means for passing a plating current through said electrolyte.
Claim 4
Dependent Claim
88 words
In combination: a body having a bore; a plurality of passages extending through said body substantially transverse to said bore and spaced along said bore, the axis of at least one of said passages being tilted at an angle of between 15* and 30* with respect to a perpendicular to the axis of said bore; means for introducing a flow of plating electrolyte through said passages; means for passing an elongated body to be plated through said bore; and means for passing a plating current through said electrolyte.
Claim 5
Dependent Claim
34 words
The combination in accordance with claim 2 wherein the axis of each of said passages is each tilted in the same direction from a perpendicular to the axis of said bore by said angle.