GB1137304A - Electrolytic production of grey oxide coatings on aluminium alloys - Google Patents

Electrolytic production of grey oxide coatings on aluminium alloys

Info

Publication number
GB1137304A
GB1137304A GB4939166A GB4939166A GB1137304A GB 1137304 A GB1137304 A GB 1137304A GB 4939166 A GB4939166 A GB 4939166A GB 4939166 A GB4939166 A GB 4939166A GB 1137304 A GB1137304 A GB 1137304A
Authority
GB
United Kingdom
Prior art keywords
anodizing
aluminium
alloy
article
nov
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
GB4939166A
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium AG
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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Publication of GB1137304A publication Critical patent/GB1137304A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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
    • C25D11/14—Producing integrally coloured layers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Forging (AREA)

Abstract

1,137,304. Anodizing aluminium; alloys. SWISS ALUMINIUM Ltd. Nov.3, 1966 [Nov. 5, 1965], No.49391/66. Headings C7A and C7B. A method of producing a grey oxide coating on an article of an aluminium alloy containing 0À5 - 2% silicon and 0À4 - 1% iron with or without one or more of copper, e.g. up to 0À2%; manganese, e.g. up to 0À8%; chromium, e.g. up to 0À4%; titanium, e.g. up to 0À1%; and magnesium e.g. up to 1%, as incidental elements comprises annealing the alloy at a temperature between 550‹ C. and the solidus temperature of the alloy e. g. within the range 570 - 620‹ C. for 1 - 24 hours, hotworking the alloy by rolling, extrusion or forging to form the article and subsequently anodizing the article in an electrolyte containing sulphuric acid. Anodizing may be carried out using direct, alternating or pulsating current. The electrolyte may also contain oxalic acid and mineral salts, e. g. aluminium sulphate. In an example the articles formed are hot-hardened at 180‹ C. and pickled in ammonium bifluoride prior to anodizing.
GB4939166A 1965-11-05 1966-11-03 Electrolytic production of grey oxide coatings on aluminium alloys Expired GB1137304A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1530465A CH465989A (en) 1965-11-05 1965-11-05 Process for the production of oxide layers with a lightfast gray inherent color on aluminum alloys

Publications (1)

Publication Number Publication Date
GB1137304A true GB1137304A (en) 1968-12-18

Family

ID=4408006

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4939166A Expired GB1137304A (en) 1965-11-05 1966-11-03 Electrolytic production of grey oxide coatings on aluminium alloys

Country Status (3)

Country Link
CH (1) CH465989A (en)
DE (1) DE1533389A1 (en)
GB (1) GB1137304A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176806A (en) * 1985-06-19 1987-01-07 Stc Plc Surface treatment of alloys

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4916341B1 (en) * 1970-12-26 1974-04-22

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176806A (en) * 1985-06-19 1987-01-07 Stc Plc Surface treatment of alloys
US4801360A (en) * 1985-06-19 1989-01-31 Stc Plc Surface treatment of aluminum/silicon alloys

Also Published As

Publication number Publication date
CH465989A (en) 1968-11-30
DE1533389A1 (en) 1969-12-18

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