GB1244503A - Improvements relating to the electrolytic deposition of ferromagnetic coatings - Google Patents
Improvements relating to the electrolytic deposition of ferromagnetic coatingsInfo
- Publication number
- GB1244503A GB1244503A GB2641268A GB2641268A GB1244503A GB 1244503 A GB1244503 A GB 1244503A GB 2641268 A GB2641268 A GB 2641268A GB 2641268 A GB2641268 A GB 2641268A GB 1244503 A GB1244503 A GB 1244503A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ions
- alloy
- coatings
- carrier
- hypophosphite
- 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
Links
- 238000000576 coating method Methods 0.000 title abstract 5
- 230000005294 ferromagnetic effect Effects 0.000 title abstract 3
- 230000008021 deposition Effects 0.000 title 1
- -1 cobaltous ions Chemical class 0.000 abstract 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 4
- 239000003792 electrolyte Substances 0.000 abstract 3
- 229910052759 nickel Inorganic materials 0.000 abstract 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract 3
- 229910000838 Al alloy Inorganic materials 0.000 abstract 1
- 229910001369 Brass Inorganic materials 0.000 abstract 1
- 229910000906 Bronze Inorganic materials 0.000 abstract 1
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 abstract 1
- 229910000861 Mg alloy Inorganic materials 0.000 abstract 1
- 229910000990 Ni alloy Inorganic materials 0.000 abstract 1
- 229910018104 Ni-P Inorganic materials 0.000 abstract 1
- 241000080590 Niso Species 0.000 abstract 1
- 229910018536 Ni—P Inorganic materials 0.000 abstract 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000010951 brass Substances 0.000 abstract 1
- 239000010974 bronze Substances 0.000 abstract 1
- 238000005234 chemical deposition Methods 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 230000000536 complexating effect Effects 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 abstract 1
- 238000005868 electrolysis reaction Methods 0.000 abstract 1
- 239000003302 ferromagnetic material Substances 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 230000005291 magnetic effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000012811 non-conductive material Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000006174 pH buffer Substances 0.000 abstract 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
1,244,503. Magnetic recording media. BURROUGHS CORP. 27 March, 1969[4June, 1968], No. 26412/68. Addition to 1,214,681. 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 immersing the carrier as cathode in an aqueous electrolyte comprising cobaltous ions in the range of 10 to 80 g./1. and a source of phosphorus which comprises up to 6 g./l. of hypophosphite ions all in the absence of complexing ions in a quantity of sufficient magnitude to cause chemical deposition, maintaining the pH of the electrolyte at 3À2 to 5À0 and applying to the cathode a current density of 10 to 120 amps/ sq. ft. so as to co-deposit P and Co on the conductive carrier. The Co may be derived from CoSO 4 and the hypophosphite from H 3 PO 2 or its Na, K, Ca or NH 4 salt. The pH may be maintained by adding H 2 SO 4 . Nickel may be added to the bath as NiSO 4 and the bath may also contain added sulphate to improve electrical conductivity, H 3 BO 3 as a pH buffer and formate as a brightener. The anode may be an alloy of 80% Co, 20% Ni or may be pure Co or Ni. The temperature may be maintained at 90-140‹ F. The anodes catalyse the oxidation of hypophosphite ions to phosphite ions in the electrolyte. The carrier may be of (a) brass, bronze, A1, Al alloy, Mg, Mg alloy or (b) a non- conductive material or ferromagnetic material over either of which is deposited or laminated a non-ferromagnetic conductive material. The deposited coatings may be 10-5000 millionths of an inch thick. Their coercivities increase with increase of hypophosphite ions. Coercivities of 110 to 800 oersteds may be obtained for Co- Ni alloy deposits and 60 to 700 oersteds for Co coatings. Remanences of 15,000 to 8500 gausses are referred to. Coatings which permit a high recording density of 2000 binary bits per inch can be produced by the process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2641268A GB1244503A (en) | 1968-06-04 | 1968-06-04 | Improvements relating to the electrolytic deposition of ferromagnetic coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2641268A GB1244503A (en) | 1968-06-04 | 1968-06-04 | Improvements relating to the electrolytic deposition of ferromagnetic coatings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1244503A true GB1244503A (en) | 1971-09-02 |
Family
ID=10243248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2641268A Expired GB1244503A (en) | 1968-06-04 | 1968-06-04 | Improvements relating to the electrolytic deposition of ferromagnetic coatings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1244503A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086149A (en) * | 1976-08-04 | 1978-04-25 | Ppg Industries, Inc. | Cathode electrocatalyst |
-
1968
- 1968-06-04 GB GB2641268A patent/GB1244503A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086149A (en) * | 1976-08-04 | 1978-04-25 | Ppg Industries, Inc. | Cathode electrocatalyst |
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