公开(公告)号：US3704211A

公开(公告)日：1972-11-28

申请号：US3704211D

申请日：1971-05-19

Applicant: IBM

Inventor： PHILLIPS SIDNEY L

IPC: C25D3/56 ,  H01F41/26 ,  C23B5/32

CPC classification number: H01F41/26 ,  C25D3/562

Abstract: A PROCESS FOR DEPOSITING A NICKEL-COBALT MAGNETIC ELECTROPLATE UPON AN ELECTRICALLY CONDUCTING SUBSTRATE BY PASSING A CURRENT BETWEEN AN ANODE AND A SUBSTRATE AS THE CATHODE THROUGH AN ELECTROLYTE, WHERE THE ELECTROLYTE CONTAINS AT LEAST A SOLUBLE NICKEL SALT AND A SOLUBLE COBALT SALT IN SOLUTION, WITH THE IMPROVEMENT FOR THE PURPOSE OF EFFECTING THE MR/HC RATIO CHARACTERIZED BY THE ADDITION OF AT LEAST A SMALL BUT EFFECTIVE AMOUNT OF RHENIUM AS A SOLUBLE RHENIUM SALT TO THE ELECTROLYTE. THE RHENIUM MAY BE SPECIFICALLY ADDED AS POTASSIUM PERRHENATE TO AN ELECTROLYE COMPRISING NICKEL CHLORIDE AND COBALT CHLORIDE SALTS IN AN AQUEOUS SOLUTION.

公开(公告)号：US3607696A

公开(公告)日：1971-09-21

申请号：US3607696D

申请日：1968-10-21

Applicant: IBM

Inventor： CORNISH BLAIR E ,  DAMM EUGENE P JR ,  PHILLIPS SIDNEY L

IPC: F28F27/00 ,  C25D13/22 ,  B01K5/02 ,  C23B13/00

CPC classification number: C25D13/22

Abstract: Normally difficult to remove coatings of certain polymeric substances, including a polytetrafluoroethylene, are removed by the presently disclosed electrical stripping technique. The coatings are deposited by electrophoresis on a conductive surface of an object used as an electrode and stripped or removed from the same surface by applying a voltage of opposite polarity while the coating particles are still in an uncoalesced condition due to retention of electrolyte fluid between the particles. Certain of these coatings are strippable even after removal of the base electrode from the electrolyte medium, provided that sufficient electrolyte moisture is retained to keep the coating in a solvated condition until reimmersion and application of the reverse voltage. The deposition and stripping actions are repeatable an indefinite number of times for particular coating substances under particular conditions. This is used in a closed system to construct specific devices based on selectively variable thermal resistance effects and visual indication effects. These effects have an associated memory property in the sense that the effect persists indefinitely upon removal of the electromotive force which is depositing or stripping the coating.