GB1244681A - Improvements in the electrolytic deposition of ferromagnetic coatings - Google Patents

Improvements in the electrolytic deposition of ferromagnetic coatings

Info

Publication number
GB1244681A
GB1244681A GB06230/69A GB1623069A GB1244681A GB 1244681 A GB1244681 A GB 1244681A GB 06230/69 A GB06230/69 A GB 06230/69A GB 1623069 A GB1623069 A GB 1623069A GB 1244681 A GB1244681 A GB 1244681A
Authority
GB
United Kingdom
Prior art keywords
hypophosphite
ions
phosphite ions
range
addition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB06230/69A
Inventor
John Patrick Faulkner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Corp
Original Assignee
Burroughs Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Burroughs Corp filed Critical Burroughs Corp
Publication of GB1244681A publication Critical patent/GB1244681A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/06—Thin magnetic films, e.g. of one-domain structure characterised by the coupling or physical contact with connecting or interacting conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/24—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates from liquids
    • H01F41/26—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates from liquids using electric currents, e.g. electroplating

Abstract

1,244,681. Magnetic recording media. BURROUGHS CORP. 27 March, 1969 [29 Jan., 1969], No. 16230/69. Addition to 1,244,503. Heading H1H. [Also in Division C7] A ferromagnetic coating (e.g. of Co-P or Co-Ni-P) is deposited solely by electrolysis on an electrically conductive carrier by the method of the parent Specification modified by providing as the source of phosphorus both hypophosphite and phosphite ions and controlling the hypophosphite ions in the range up to 4 g./1. and the phosphite ions in the range up to 12 g./1. by determining and adjusting their concentrations to obtain a predetermined coercivity in the ferromagnetic coating. The hypophosphite and phosphite ions may be derived from H 3 PO 2 and H 3 PO 3 or their respective Na, K, Ca or NH 4 salts. Other differences from the parent Specification are: the pH can be maintained by the addition of nickel carbonate, K 2 CO 3 , Na 2 CO 3 or H 2 SO 4 . The bath may be agitated adjacent the surface being plated. The coatings deposited may have thicknesses of 5 to 500 millionths of an inch. A recording density of 3000 binary bits per inch can be achieved on films produced by the method.
GB06230/69A 1969-01-29 1969-03-27 Improvements in the electrolytic deposition of ferromagnetic coatings Expired GB1244681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79505469A 1969-01-29 1969-01-29

Publications (1)

Publication Number Publication Date
GB1244681A true GB1244681A (en) 1971-09-02

Family

ID=25164534

Family Applications (1)

Application Number Title Priority Date Filing Date
GB06230/69A Expired GB1244681A (en) 1969-01-29 1969-03-27 Improvements in the electrolytic deposition of ferromagnetic coatings

Country Status (5)

Country Link
US (1) US3637471A (en)
BE (1) BE729665A (en)
DE (1) DE1920221C3 (en)
FR (1) FR2029599A6 (en)
GB (1) GB1244681A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3950234A (en) * 1974-10-29 1976-04-13 Burroughs Corporation Method for electrodeposition of ferromagnetic alloys and article made thereby
US4345007A (en) * 1975-12-17 1982-08-17 General Electric Company Electro-deposition of a nonmagnetic conductive coating for memory wire protection
DE3001080C2 (en) * 1980-01-14 1984-10-25 Metallgesellschaft Ag, 6000 Frankfurt Process for leaching uranium from pain
US4469566A (en) * 1983-08-29 1984-09-04 Dynamic Disk, Inc. Method and apparatus for producing electroplated magnetic memory disk, and the like
EP0422760A1 (en) * 1989-10-12 1991-04-17 Mitsubishi Rayon Co., Ltd Amorphous alloy and process for preparation thereof
US6406611B1 (en) * 1999-12-08 2002-06-18 University Of Alabama In Huntsville Nickel cobalt phosphorous low stress electroplating
WO2002063070A1 (en) * 2001-02-08 2002-08-15 The University Of Alabama In Huntsville Nickel cobalt phosphorous low stress electroplating
US6982030B2 (en) * 2002-11-27 2006-01-03 Technic, Inc. Reduction of surface oxidation during electroplating
US20070170068A1 (en) * 2006-01-24 2007-07-26 Usc, Llc Electrocomposite coatings for hard chrome replacement
US7897265B2 (en) * 2006-01-26 2011-03-01 Hamilton Sundstrand Corporation Low cost, environmentally favorable, chromium plate replacement coating for improved wear performance
MX2010014396A (en) * 2008-06-18 2011-06-17 Massachusetts Inst Technology Catalytic materials, electrodes, and systems for water electrolysis and other electrochemical techniques.
US20130065069A1 (en) * 2011-09-09 2013-03-14 Yun Li Liu Electrodeposition of Hard Magnetic Coatings
CN111926356A (en) * 2020-08-04 2020-11-13 深圳市生利科技有限公司 Cobalt alloy electroplating solution and use method thereof

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2026718A (en) * 1935-03-30 1936-01-07 Weisberg & Greenwald Inc Electrodeposition of metals
US2644787A (en) * 1950-01-05 1953-07-07 Eckert Mauchly Comp Corp Electrodeposition of a magnetic coating
US2643221A (en) * 1950-11-30 1953-06-23 Us Army Electrodeposition of phosphorusnickel and phosphorus-cobalt alloys
US2921888A (en) * 1956-10-26 1960-01-19 Vertol Aircraft Corp Electroplating titanium ano titanium alloys
US3202590A (en) * 1960-08-19 1965-08-24 Ibm Electrodeposition of cobalt-phosphorus alloys
GB1001024A (en) * 1961-02-20 1965-08-11 Honeywell Inc Improvements in or relating to the production of magnetic coatings
NL283192A (en) * 1961-09-14
US3138479A (en) * 1961-12-20 1964-06-23 Burroughs Corp Method for the electroless deposition of high coercive magnetic film
BE626910A (en) * 1962-01-12
GB1072650A (en) * 1963-12-16 1967-06-21 Ibm Improvements in or relating to electrodeposition
US3362893A (en) * 1964-04-27 1968-01-09 Ibm Method and apparatus for the high speed production of magnetic films

Also Published As

Publication number Publication date
US3637471A (en) 1972-01-25
DE1920221C3 (en) 1973-12-06
DE1920221A1 (en) 1970-09-17
DE1920221B2 (en) 1973-04-26
FR2029599A6 (en) 1970-10-23
BE729665A (en) 1969-08-18

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