Sheet with aluminum coating that is resistant to cracking
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United States of America Patent
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Dec 11, 2001
Grant Date -
N/A
app pub date -
Feb 25, 1999
filing date -
Feb 25, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A metallic sheet with an aluminum coating, the coating having an internal layer of iron/aluminum/silicon alloys, and an external layer, thicker, of an aluminum-based phase and secondarily of phases in the form of needles or elongated lamellae. The projection of the length of all needles or lamellae in a direction perpendicular to the plane of the external layer is less than the thickness of this layer. This structure, which is obtained by a thermal treatment of the external layer at a temperature of 570-660.degree. C., notably for less than 15 sec, considerably decreases the risks of cracking.
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