GB1235661A - Production of lacquered aluminium or aluminium alloy strip or sheet - Google Patents
Production of lacquered aluminium or aluminium alloy strip or sheetInfo
- 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
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Centrifugal Separators (AREA)
- Electroplating Methods And Accessories (AREA)
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.
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)
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 |
-
1967
- 1967-03-30 GB GB1469167A patent/GB1235661A/en not_active Expired
-
1968
- 1968-03-28 DE DE19681771057 patent/DE1771057C3/en not_active Expired
- 1968-03-29 NO NO121468A patent/NO128717B/no unknown
Cited By (4)
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 |
DE1771057B2 (en) | 1974-05-30 |
DE1771057C3 (en) | 1979-11-08 |
DE1771057A1 (en) | 1972-01-13 |
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