GB1235661A - Production of lacquered aluminium or aluminium alloy strip or sheet - Google Patents

Production of lacquered aluminium or aluminium alloy strip or sheet

Info

Publication number
GB1235661A
GB1235661A GB1469167A GB1469167A GB1235661A GB 1235661 A GB1235661 A GB 1235661A GB 1469167 A GB1469167 A GB 1469167A GB 1469167 A GB1469167 A GB 1469167A GB 1235661 A GB1235661 A GB 1235661A
Authority
GB
United Kingdom
Prior art keywords
strip
bath
aluminium
oxide coating
aluminium alloy
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
GB1469167A
Inventor
Leslie Lister
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 Research and Development Ltd
Original Assignee
Alcan Research and Development 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 Alcan Research and Development Ltd filed Critical Alcan Research and Development Ltd
Priority to GB1469167A priority Critical patent/GB1235661A/en
Priority to DE19681771057 priority patent/DE1771057C3/en
Priority to NO121468A priority patent/NO128717B/no
Publication of GB1235661A publication Critical patent/GB1235661A/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
    • 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

Abstract

1,235,661. Anodizing aluminium. ALCAN RESEARCH & DEVELOPMENT Ltd. March 15, 1968 [March 30, 1967], No.14691/67. Heading C7B. An aluminium or aluminium alloy strip is provided with a thin e.g. 0À05 micron oxide coating by passing it through an aqueous sulphuric acid bath at a temperature of not less than 50‹C. but below the bath boiling point so as to have a dwell time in the bath of 0À5 to 15 seconds and passing A.C. between the strip and at least one electrode in the bath to provide a current density at the strip surface of at least 20 amps./sq. ft. Preferably the aqueous bath contains at least 20 to 25% sulphuric acid by weight and is used at 80 to 100‹ C. with a current density of 60 to 160 amps. / sq. ft. with a dwell time of 2 to 7À5 seconds. The resultant oxide coating has comparatively large craters (300 to 400A diameter) which provides a good anchorage for lacquers used in the canning industries so that the lacquer coating is not detached by mechanical deformation of the strip in can manufacture. Comparative tests are given for an aluminium alloy containing 2% Mg and 0À25% Mn subjected to different current densities and bath dwell times. The process may be effected by feeding the strip through a shallow tank divided into strip entry and exit and two central compartments by partitions having a slot with a rubber gasket through which the strip passes, the slot in the central partition having a rubber gasket, counter electrodes being arranged parallel to opposite faces of the strip in the two central compartments and connected so that current passes along the strip which is alternately cathodic and anodic. Prior degreasing of the strip is unnecessary. As an alternative the electrolyte may be fed in counterflow to the strip movement so that grease on the strip is prevented from contaminating the oxide coating, electrolyte containing freed grease overflowing a weir at the strip entry end of the tank.
GB1469167A 1967-03-30 1967-03-30 Production of lacquered aluminium or aluminium alloy strip or sheet Expired GB1235661A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1469167A GB1235661A (en) 1967-03-30 1967-03-30 Production of lacquered aluminium or aluminium alloy strip or sheet
DE19681771057 DE1771057C3 (en) 1967-03-30 1968-03-28 Process for the pretreatment of aluminum strips prior to painting by anodic oxidation
NO121468A NO128717B (en) 1967-03-30 1968-03-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1469167A GB1235661A (en) 1967-03-30 1967-03-30 Production of lacquered aluminium or aluminium alloy strip or sheet

Publications (1)

Publication Number Publication Date
GB1235661A true GB1235661A (en) 1971-06-16

Family

ID=10045846

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1469167A Expired GB1235661A (en) 1967-03-30 1967-03-30 Production of lacquered aluminium or aluminium alloy strip or sheet

Country Status (3)

Country Link
DE (1) DE1771057C3 (en)
GB (1) GB1235661A (en)
NO (1) NO128717B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU571424B2 (en) * 1984-11-05 1988-04-14 Alcan International Limited Anodic aluminium oxide films
AU583315B2 (en) * 1984-11-05 1989-04-27 Alcan International Limited A method of fabricating structures from aluminium sheet and structures comprising aluminium components
US4972047A (en) * 1985-11-14 1990-11-20 Alcan International Limited Resistance welding of aluminium
WO2011059341A1 (en) * 2009-11-13 2011-05-19 Norsk Hydro Asa Process for production of magnesium containing aluminium strip or web material with improved adhesion

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU571424B2 (en) * 1984-11-05 1988-04-14 Alcan International Limited Anodic aluminium oxide films
AU583315B2 (en) * 1984-11-05 1989-04-27 Alcan International Limited A method of fabricating structures from aluminium sheet and structures comprising aluminium components
US4972047A (en) * 1985-11-14 1990-11-20 Alcan International Limited Resistance welding of aluminium
WO2011059341A1 (en) * 2009-11-13 2011-05-19 Norsk Hydro Asa Process for production of magnesium containing aluminium strip or web material with improved adhesion

Also Published As

Publication number Publication date
NO128717B (en) 1974-01-02
DE1771057A1 (en) 1972-01-13
DE1771057B2 (en) 1974-05-30
DE1771057C3 (en) 1979-11-08

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