GB1121241A - Improvements relating to methods of producing alumina films - Google Patents

Improvements relating to methods of producing alumina films

Info

Publication number
GB1121241A
GB1121241A GB346567A GB346567A GB1121241A GB 1121241 A GB1121241 A GB 1121241A GB 346567 A GB346567 A GB 346567A GB 346567 A GB346567 A GB 346567A GB 1121241 A GB1121241 A GB 1121241A
Authority
GB
United Kingdom
Prior art keywords
alumina
film
frame
foil
aluminium
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
GB346567A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1121241A publication Critical patent/GB1121241A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • 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
    • 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
    • C25D11/045—Anodisation of aluminium or alloys based thereon for forming AAO templates

Abstract

A method of manufacturing an alumina film comprises the steps of forming a porous alumina frame 5-20 m thick on one side of an aluminium foil by anodic oxidation, forming an alumina film on the same side of the foil by anodic oxidation of the foil enclosed by said frame such that the film and the frame are integral, and then removing the remaining metallic aluminium with the aid of a reagent which dissolves aluminium but does not appreciably attack the alumina. The porous alumina frame may be formed using an oxalic acid or sulphuric acid electrolyte and the alumina film, which may be about 0.1 m thick, may be formed using a 4% aqueous solution of tartaric acid or a 6% aqueous solution of boric acid containing 1.5% sodium borate. The reagent used to dissolve the metallic aluminium may be a mixture of hydrofluoric and nitric acids or a mixture of chromic and phosphoric acids. The film may be formed with two concentric annular frames, the outer being later cut away. A vopour deposited layer, e.g. of PbO may be formed upon the alumina film.
GB346567A 1966-01-27 1967-01-24 Improvements relating to methods of producing alumina films Expired GB1121241A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6601018A NL6601018A (en) 1966-01-27 1966-01-27

Publications (1)

Publication Number Publication Date
GB1121241A true GB1121241A (en) 1968-07-24

Family

ID=19795567

Family Applications (1)

Application Number Title Priority Date Filing Date
GB346567A Expired GB1121241A (en) 1966-01-27 1967-01-24 Improvements relating to methods of producing alumina films

Country Status (5)

Country Link
BE (1) BE693171A (en)
DE (1) DE1621121B1 (en)
FR (1) FR1509535A (en)
GB (1) GB1121241A (en)
NL (1) NL6601018A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278737A (en) 1978-08-04 1981-07-14 United States Borax & Chemical Corporation Anodizing aluminum

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1131481B (en) * 1958-03-03 1962-06-14 Dr Ulrich Hauser Aluminum oxide or beryllium oxide film as a window for the passage of radiation and process for their production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278737A (en) 1978-08-04 1981-07-14 United States Borax & Chemical Corporation Anodizing aluminum

Also Published As

Publication number Publication date
NL6601018A (en) 1967-07-28
FR1509535A (en) 1968-01-12
BE693171A (en) 1967-07-25
DE1621121B1 (en) 1970-06-25

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