Anodising aluminum alloy
AssigneeShort Brothers PLC
InventorsGary Critchlow, Ian Ashcroft, Timothy Cartwright, David Bahrani
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Abstract
An anodic oxide film is formed on an aluminium or aluminium alloy work piece by forming an anodic oxide film on the work piece by AC electrolysis followed by subjecting the work piece to DC electrolysis. The AC anodizing step may be conducted at a voltage of 5 to 30V for 30 seconds to 10 minutes and the DC anodizing step may be conducted at a voltage of 5 to 30V for a period of 1 to 20 minutes. The anodic oxide coating is suitable for adhesive bonding of aluminium alloy work pieces.
Claims13
A method of producing an anodic oxide film on an aluminum or aluminum alloy workpiece which comprises:
- forming an anodic oxide film on the workpiece by AC electrolysis in an anodising solution followed by
- subjecting the workpiece to DC electrolysis in the anodising solution
- wherein the anodising solution comprises, in volume %, 1 to 10% of a first acid and 1 to 10% of a second acid.
Dependencies are inferred from the claim text.