US2491126A - Method of electroplating on chromium or chromium-iron alloys - Google Patents

Method of electroplating on chromium or chromium-iron alloys Download PDF

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Publication number
US2491126A
US2491126A US607662A US60766245A US2491126A US 2491126 A US2491126 A US 2491126A US 607662 A US607662 A US 607662A US 60766245 A US60766245 A US 60766245A US 2491126 A US2491126 A US 2491126A
Authority
US
United States
Prior art keywords
chromium
plating
articles
electroplating
iron alloys
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 - Lifetime
Application number
US607662A
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English (en)
Inventor
Mcgill Eric Frederick George
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Application granted granted Critical
Publication of US2491126A publication Critical patent/US2491126A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated

Definitions

  • chrome-iron alloys it is found diflicult to provide a good adherent film of plated metal on said alloy which will not blister on heating or peel off when the alloy is bent to breaking point. Accordingly, it is the object of the present invention to provide an improved method of electro-plating in particular for chrome-iron alloys with a View to avoiding these disadvantages.
  • a method of electro-plating in which the metal to be plated, prior to the plating operation, is provided with a thin film of sodium or potassium bisulphate.
  • the sodium or potassium bisulphate is applied to the article by dipping the article in a bath of molten sodium or potassium bisulphate at a temperature of about 300 to 350 C.
  • the sodium or potassium bisulphate film thus applied serves, it is believed, to remove any resistant oxide film and to protect the articles from reoxidation, the film solidifying on the article as the film cools.
  • the invention is particularly applicable to the electro-plating of chromium alloys, in particular chrome-iron alloys, and in one example of the invention the articles made from such an alloy or sheets or other preformed members of such an alloy, hereinafter referred to collectively as articles, are first electrolytically cleaned or cleaned in any of the other manners known in the art and then dried. The articles are then dipped for about five seconds in a bath of fused hydrated sodium bisulphate maintained at a temperature of about 300 to 350 C. and then allowed to cool. The articles are then made the cathode in a nickel plating bath and during the electroplating action the bisulphate film is dissolved and replaced by a film of nickel.
  • the articles are then removed from the bath, washed thoroughly and, if desired, provided with a further coating of another metal, such as copper. Where such a further coating is required, a copper cyanide plating bath is preferably employed and a desired thickness of copper is thus applied to the articles.
  • the bisulphate film applied to the articles protects the latter from oxidation after having been cleaned by normal methods so that platings of copper applied to articles formed of chrome-iron alloys will not blister on heating or peel off when the articles are bent to breaking point. Satisfactory results have been obtained with a chrome-iron alloy containing 23 per cent of chromium, and. with pure chromium both in the solid form and as a plating.
  • the invention is not necessarily limited to the plating of articles made of chromeiron alloys.
  • the invention is particularly suitable for use in the plating of chrome-iron pins which are ultimately sealed to a glass .base or envelope of a high frequency electron discharge device.
  • Such pins are preferably copper plated in order to increase their electrical conductivity.
  • a method of electroplating on a basis metal consisting essentially of chromium and iron comprising cleaning and then drying said basis metal, dipping said basis metal in a bath of a fused salt from the class consisting of sodium bisulphate and potassium bisulphate, whereby said basis metal is provided with a thin film of said salt to protect the basis metal from oxidation, withdrawing the filmed metal from said bath, allowing the filmed metal to cool, and then electroplating upon said basis metal in a bath of a metal from the class consisting of nickel and copper, whereby the bisulphate is dissolved and is replaced by a coating of said last mentioned metal.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US607662A 1944-08-02 1945-07-28 Method of electroplating on chromium or chromium-iron alloys Expired - Lifetime US2491126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14803/44A GB575309A (en) 1944-08-02 1944-08-02 Improvements in or relating to electro-plating

Publications (1)

Publication Number Publication Date
US2491126A true US2491126A (en) 1949-12-13

Family

ID=10047744

Family Applications (1)

Application Number Title Priority Date Filing Date
US607662A Expired - Lifetime US2491126A (en) 1944-08-02 1945-07-28 Method of electroplating on chromium or chromium-iron alloys

Country Status (4)

Country Link
US (1) US2491126A (enrdf_load_stackoverflow)
FR (1) FR912738A (enrdf_load_stackoverflow)
GB (1) GB575309A (enrdf_load_stackoverflow)
NL (1) NL62625C (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574305A (en) * 1948-09-22 1951-11-06 Gen Motors Corp Activating process for plating
US3002899A (en) * 1959-07-31 1961-10-03 Jr Walter E Reid Adhesion of nickel to chromium
US3108931A (en) * 1960-03-23 1963-10-29 Burroughs Corp Etching of chromium alloys
US3184668A (en) * 1963-02-15 1965-05-18 Smith Kline French Lab Master-slave plural motor synchronizing system
US3467584A (en) * 1966-10-24 1969-09-16 Ernest H Lyons Jr Plating platinum metals on chromium
US3502548A (en) * 1966-10-24 1970-03-24 Ernest H Lyons Jr Method of electroplating gold on chromium

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE33686T1 (de) * 1982-02-09 1988-05-15 Ibm Elektrolytische abscheidung von chrom und seinen legierungen.

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1665638A (en) * 1925-09-22 1928-04-10 Morrison Montford X-ray tube
US1726623A (en) * 1924-04-11 1929-09-03 Gen Electric Method of removing coatings from conductors
US1795512A (en) * 1926-04-01 1931-03-10 Metal & Thermit Corp Process for the production of electrolytic deposits
US1950689A (en) * 1930-05-09 1934-03-13 John S Nachtman Method of and apparatus for electropickling metal
USRE20306E (en) * 1935-05-13 1937-03-23 Method for gold plating
GB527754A (en) * 1938-05-04 1940-10-15 Vaw Ver Aluminium Werke Ag An improved process for galvanically coating articles of aluminium or aluminium alloys
US2285548A (en) * 1937-12-01 1942-06-09 Int Nickel Co Process for electrodepositing an adherent coating of copper on chromium-contanining alloys of iron and/or nickel
US2293810A (en) * 1938-06-22 1942-08-25 Nat Standard Co Electroplating stainless steel
US2353026A (en) * 1941-10-18 1944-07-04 Du Pont Metal-cleaning process and composition
US2419190A (en) * 1942-04-09 1947-04-15 Du Pont Conditioning treatment of magnesium for electroplating
US2441776A (en) * 1938-10-21 1948-05-18 Freeport Sulphur Co Process of metal coating metal articles

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726623A (en) * 1924-04-11 1929-09-03 Gen Electric Method of removing coatings from conductors
US1665638A (en) * 1925-09-22 1928-04-10 Morrison Montford X-ray tube
US1795512A (en) * 1926-04-01 1931-03-10 Metal & Thermit Corp Process for the production of electrolytic deposits
US1950689A (en) * 1930-05-09 1934-03-13 John S Nachtman Method of and apparatus for electropickling metal
USRE20306E (en) * 1935-05-13 1937-03-23 Method for gold plating
US2285548A (en) * 1937-12-01 1942-06-09 Int Nickel Co Process for electrodepositing an adherent coating of copper on chromium-contanining alloys of iron and/or nickel
GB527754A (en) * 1938-05-04 1940-10-15 Vaw Ver Aluminium Werke Ag An improved process for galvanically coating articles of aluminium or aluminium alloys
US2293810A (en) * 1938-06-22 1942-08-25 Nat Standard Co Electroplating stainless steel
US2441776A (en) * 1938-10-21 1948-05-18 Freeport Sulphur Co Process of metal coating metal articles
US2353026A (en) * 1941-10-18 1944-07-04 Du Pont Metal-cleaning process and composition
US2419190A (en) * 1942-04-09 1947-04-15 Du Pont Conditioning treatment of magnesium for electroplating

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574305A (en) * 1948-09-22 1951-11-06 Gen Motors Corp Activating process for plating
US3002899A (en) * 1959-07-31 1961-10-03 Jr Walter E Reid Adhesion of nickel to chromium
US3108931A (en) * 1960-03-23 1963-10-29 Burroughs Corp Etching of chromium alloys
US3184668A (en) * 1963-02-15 1965-05-18 Smith Kline French Lab Master-slave plural motor synchronizing system
US3467584A (en) * 1966-10-24 1969-09-16 Ernest H Lyons Jr Plating platinum metals on chromium
US3502548A (en) * 1966-10-24 1970-03-24 Ernest H Lyons Jr Method of electroplating gold on chromium

Also Published As

Publication number Publication date
NL62625C (enrdf_load_stackoverflow)
FR912738A (fr) 1946-08-19
GB575309A (en) 1946-02-12

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