GB1464857A - Chromic acid anodising of aluminium and its alloys - Google Patents

Chromic acid anodising of aluminium and its alloys

Info

Publication number
GB1464857A
GB1464857A GB623473A GB623473A GB1464857A GB 1464857 A GB1464857 A GB 1464857A GB 623473 A GB623473 A GB 623473A GB 623473 A GB623473 A GB 623473A GB 1464857 A GB1464857 A GB 1464857A
Authority
GB
United Kingdom
Prior art keywords
chromic acid
constant
film
alloys
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
GB623473A
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.)
National Research Development Corp UK
National Research Development Corp of India
Original Assignee
National Research Development Corp UK
National Research Development Corp of India
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 National Research Development Corp UK, National Research Development Corp of India filed Critical National Research Development Corp UK
Priority to GB623473A priority Critical patent/GB1464857A/en
Publication of GB1464857A publication Critical patent/GB1464857A/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
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

1464857 Anodizing Al in chromic acid NATIONAL RESEARCH DEVELOPMENT CORP 8 May 1974 [8 Feb 1973 12 June 1973] 6234/73 and 27850/73 Heading C7B Al or Al alloy is anodized in chromic acid of 0À05-0À7M at 55 to 70‹C at a c.d. below 50 mA/cm<SP>2</SP> but, for at least the major portion of the process, above 6 mA/cm<SP>2</SP> to produce an anodic film of thickness at least 15Á. Conditions are e.g. 90-150V for up to 90 mins. D.C. with up to 10 per cent A.C. may be used. Air agitation at the electrodes is specified with a steel cathode, and cathode: anode area ratio from 10-30:1. Increased V at constant c.d. produces a film having pores whose size increases towards the Al surface. Operation at constant V is possible. The anodic film may be sealed in boiling water or steam or with a lacquer or resin. Pre-treatments include degreasing and etching in inhibited NaOH or electro-polishing in HClO 4 /ethanol.
GB623473A 1974-05-08 1974-05-08 Chromic acid anodising of aluminium and its alloys Expired GB1464857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB623473A GB1464857A (en) 1974-05-08 1974-05-08 Chromic acid anodising of aluminium and its alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB623473A GB1464857A (en) 1974-05-08 1974-05-08 Chromic acid anodising of aluminium and its alloys

Publications (1)

Publication Number Publication Date
GB1464857A true GB1464857A (en) 1977-02-16

Family

ID=9810852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB623473A Expired GB1464857A (en) 1974-05-08 1974-05-08 Chromic acid anodising of aluminium and its alloys

Country Status (1)

Country Link
GB (1) GB1464857A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136448A (en) * 1983-03-18 1984-09-19 Nippon Light Metal Co Anodising Aluminium Substrate for Magnetic Recording Media
US4507179A (en) * 1984-03-01 1985-03-26 Nippon Light Metal Company Limited Process of producing aluminum substrate for magnetic recording media
GB2173819A (en) * 1985-03-26 1986-10-22 British Aerospace Chromic acid anodising of aluminium prior to adhesive bonding
EP0216543A1 (en) * 1985-09-04 1987-04-01 Furukawa Aluminum Co., Ltd. Method of manufacturing of an anodized memory disc substrate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136448A (en) * 1983-03-18 1984-09-19 Nippon Light Metal Co Anodising Aluminium Substrate for Magnetic Recording Media
US4507179A (en) * 1984-03-01 1985-03-26 Nippon Light Metal Company Limited Process of producing aluminum substrate for magnetic recording media
GB2173819A (en) * 1985-03-26 1986-10-22 British Aerospace Chromic acid anodising of aluminium prior to adhesive bonding
US4690736A (en) * 1985-03-26 1987-09-01 British Aerospace Public Limited Company Chromic acid anodizing of aluminium prior to adhesive bonding
GB2173819B (en) * 1985-03-26 1989-07-12 British Aerospace Chromic acid anodising of aluminium prior to adhesive bonding
EP0216543A1 (en) * 1985-09-04 1987-04-01 Furukawa Aluminum Co., Ltd. Method of manufacturing of an anodized memory disc substrate

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee