Anodized-quality aluminum alloys and related products and methods
AssigneeNovelis Inc.
InventorsDaehoon Kang, Wei Wen, Devesh Mathur
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Abstract
Disclosed are alloys for anodized-quality aluminum sheets with improved surface quality, and methods for making these sheets. The alloys are designed to minimize the formation of cathodic intermetallic particles that result in surface streaks of anodized sheet products formed from the alloys. Further, the alloys allow the incorporation of recycled scrap aluminum in anodized-quality sheets.
Claims13
An aluminum alloy, comprising 0.10-0.30 wt. % Fe, 0.10-0.30 wt. % Si, 0-0.25 wt. % Cr, 2.0-3.0 wt. % Mg, 0.05-0.10 wt. % Mn, 0.02-0.06 wt. % Cu, unavoidable impurities up to 0.05 wt. % for each impurity, up to 0.15 wt. % for total impurities, and the balance aluminum, wherein the aluminum alloy comprises Si and Fe in a Si:Fe ratio of from 0.67:1 to 2.5:1.
A method of preparing an aluminum sheet, comprising:
- casting an aluminum alloy to form an ingot;
- homogenizing the ingot;
- hot rolling the ingot to produce a hot rolled intermediate product;
- cold rolling the hot rolled intermediate product to produce a cold rolled intermediate product;
- interannealing the cold rolled intermediate product to produce an interannealed product;
- cold rolling the interannealed product to produce a cold rolled sheet;
- and
- annealing the cold rolled sheet to form an annealed sheet, wherein the aluminum alloy comprises 0.10-0.30 wt. % Fe, 0.10-0.30 wt. % Si, 0-0.25 wt. % Cr, 2.0-3.0 wt. % Mg, 0.05-0.10 wt. % Mn, 0.02-0.06 wt. % Cu, unavoidable impurities up to 0.05 wt. % for each impurity, up to 0.15 wt. % for total impurities, and the balance aluminum, and wherein the aluminum alloy comprises Si and Fe in a ratio of Si:Fe from 0.2:1 to 2.5:1.
Dependencies are inferred from the claim text.