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AssigneeSumitomo Light Metal Industries, Ltd.
InventorsMineo ASANO, Yusuke YAMAMOTO
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An aluminum alloy sheet that exhibits excellent surface quality after anodizing, includes a peritectic element that undergoes a peritectic reaction with at least aluminum, and requires an anodic oxide coating is characterized in that the concentration of the peritectic element in a solid-solution state that is present in the outermost surface area of the aluminum alloy sheet varies in the widthwise direction of the aluminum alloy sheet in the form of a band having a width of 0.05 mm or less, and the difference in the concentration of the peritectic element between adjacent bands is 0.008 mass % or less.
An aluminum alloy sheet that exhibits excellent surface quality after anodizing, the aluminum alloy sheet comprising a peritectic element that undergoes a peritectic reaction with at least aluminum, and requiring an anodic oxide coating, a concentration of the peritectic element in a solid-solution state that is present in an outermost surface area of the aluminum alloy sheet varying in a widthwise direction of the aluminum alloy sheet in a form of a band having a width of 0.05 mm or more, and a difference in the concentration of the peritectic element between adjacent bands being 0.008 mass % or less.
A method for producing the aluminum alloy sheet comprising subjecting an ingot to hot rolling and cold rolling to produce an aluminum alloy sheet, a rolling target side of the ingot having a structure in which a difference in concentration of a peritectic element between an area having a diameter of 5 μm and positioned in a center area of a crystal grain and an area having a diameter of 5 μm and positioned away from a grain boundary of the crystal grain by 2.5 μm is 0.040% or less.
Dependencies are inferred from the claim text.