Aluminium alloy sheet with roughened surface
AssigneeNovelis Inc.
InventorsJohn Andrew Ward, Jonathan Ball, Martin Philip Amor
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Abstract
There is disclosed a process for producing an aluminium alloy sheet, which comprises subjecting a surface of the sheet to anodising conditions to form on the surface an aluminium oxide barrier layer of thickness 10 to 50 nm and treating the oxide layer with an aqueous solution of alkali to remove the layer, thereby leaving a roughened surface on the alloy sheet.
Claims31
A process for producing aluminium alloy sheet having a roughened surface which process comprises the steps of (1) subjecting a surface of the aluminium alloy sheet to be treated to anodising conditions to form on the said surface an aluminium oxide barrier layer having a barrier layer thickness in the range of from 10 to 50 nm, and (2) treating the aluminium oxide layer with an aqueous solution of alkali at temperature of 35° C. to 80° C. for a period of time sufficient to remove entirely said layer from the alloy surface thereby leaving a roughened surface on the alloy sheet.
A method of making a grained aluminium alloy sheet which comprises (1) subjecting a surface of a sheet of an aluminium alloy, to anodising conditions to form on the said surface an aluminium oxide barrier layer having a barrier layer thickness of from 10 to 50 nm;
- (2) treating the aluminium oxide layer with an aqueous solution of alkali at a temperature of 35° C. to 80° C. for a period of time sufficient to remove entirely said layer from the alloy surface thereby leaving a roughened surface on the alloy sheet, and (3) subjecting the roughened surface of the alloy sheet to graining.
A process for producing aluminium alloy sheet having a roughened surface which process comprises the steps of (1) providing an aluminium alloy sheet the surface of which has been subjected to anodising conditions to form on the said surface an aluminium oxide barrier layer having a barrier layer thickness in the range of from 10 to 50 nm, and (2) treating the aluminium oxide layer with an aqueous solution of alkali at temperature of 35° C. to 80° C. for a period of time sufficient to remove entirely said layer from the alloy surface thereby leaving a roughened surface on the alloy sheet.
Dependencies are inferred from the claim text.