Aluminium alloys strips with high surface homogeneity and method for making same
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United States of America Patent
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Dec 28, 2004
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N/A
app pub date -
Aug 8, 2000
filing date -
Feb 13, 1998
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Expired
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Abstract
An aluminum alloy strip of high surface homogeneity, intended for applications requiring good visual quality or specific optical properties, such as reflectors and anodized plates for construction and decoration. The strip may be characterized by an upper side having, after a 1 .mu.m thick sulphur anodic treatment, an optical roughness value S.sub.N measured on three 5 cm longitudinal sections and three 5 cm transverse sections, such that there is mean variation on each section, defined by the ratio: (Maximum S.sub.N -minimum S.sub.N)/Mean S.sub.N which is less than 20%, and a difference .DELTA.S.sub.N =S.sub.N max-S.sub.N min which is less than 20.
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