Aluminum products having improved corrosion resistance

Details Aluminum products having improved corrosion resistance Aluminum products having improved corrosion resistance

B - Operations, Transporting

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B

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B32B 15/20 (2006.01) B23K 35/28 (2006.01) B32B 15/01 (2006.01) C23C 26/00 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1307175

-1- Abstract A corrosion resistant aluminum article is described. It includes a main body portion formed of an aluminum alloy containing no more than 0.4% iron, no more than 0.15% silicon, from about 0.1% to about 0.6% copper and from about 0.7% to about 1.5% manganese. The corrosion resistance is provided by a silicon-rich band of dense precipitate formed in the alloy adjacent at least one face thereof. This band has a thickness of about 20-50 µm and there is substantially less manganese in solid solution in the band than in the alloy outside the band. To form the band, a silicon- containing layer is applied to a surface of the alloy body to be protected and the composite thus formed is heat treated at a temperature of at least 550°C.

558078

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