GB732552A - Improvements in or relating to electrical devices provided with metal caps, and to the manufacture of such caps - Google Patents

Improvements in or relating to electrical devices provided with metal caps, and to the manufacture of such caps

Info

Publication number
GB732552A
GB732552A GB1450652A GB1450652A GB732552A GB 732552 A GB732552 A GB 732552A GB 1450652 A GB1450652 A GB 1450652A GB 1450652 A GB1450652 A GB 1450652A GB 732552 A GB732552 A GB 732552A
Authority
GB
United Kingdom
Prior art keywords
solution
caps
distilled water
oxide layer
cap
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
GB1450652A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB1450652A priority Critical patent/GB732552A/en
Publication of GB732552A publication Critical patent/GB732552A/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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/66—Treatment of aluminium or alloys based thereon
    • C23C22/67—Treatment of aluminium or alloys based thereon with solutions containing hexavalent chromium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)
  • ing And Chemical Polishing (AREA)

Abstract

Metal caps for lamps are composed of aluminium (including alloys of aluminium) and both the exterior and interior surfaces of the caps are provided with an adherent layer of substantially non-porous aluminium oxide to prevent corrosion. According to one method of forming the oxide layer the cap is immersed for 3-5 minutes in a solution of crystalline sodium carbonate, anhydrous potassium chromate and distilled water maintained at a temperature of 90-100 DEG C. After washing, the oxide layer is sealed and hardened by immersion in a solution of sodium silicate and distilled water maintained at 90 DEG C. and the cap is again washed. In another method the cap is first etched by immersion in a solution of hydrofluoric acid, nitric acid and distilled water and after washing is immersed in a solution similar to that used in the first method plus sodium metasilicate. The oxide layer is sealed and hardened as before. In a further method a solution of anhydrous sodium carbonate, anhydrous sodium chromate, crystalline disodium hydrogen phosphate, and distilled water is used and the oxide layer is sealed as in the previous methods.
GB1450652A 1952-06-09 1952-06-09 Improvements in or relating to electrical devices provided with metal caps, and to the manufacture of such caps Expired GB732552A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1450652A GB732552A (en) 1952-06-09 1952-06-09 Improvements in or relating to electrical devices provided with metal caps, and to the manufacture of such caps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1450652A GB732552A (en) 1952-06-09 1952-06-09 Improvements in or relating to electrical devices provided with metal caps, and to the manufacture of such caps

Publications (1)

Publication Number Publication Date
GB732552A true GB732552A (en) 1955-06-29

Family

ID=10042426

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1450652A Expired GB732552A (en) 1952-06-09 1952-06-09 Improvements in or relating to electrical devices provided with metal caps, and to the manufacture of such caps

Country Status (1)

Country Link
GB (1) GB732552A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2930125A1 (en) * 1978-08-09 1980-02-14 Gen Electric ALUMINUM BASE FOR ELECTRIC LAMPS WITH A PLASTIC COVER TO IMPROVE CORROSION RESISTANCE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2930125A1 (en) * 1978-08-09 1980-02-14 Gen Electric ALUMINUM BASE FOR ELECTRIC LAMPS WITH A PLASTIC COVER TO IMPROVE CORROSION RESISTANCE

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