Aluminum products having improved corrosion resistance

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

1989-01-25

1991-08-06

Dean, R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148 115A, 148 115Q, 148127, B32B 1510, C21D 100

Patent

active

050377078

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 .mu.m 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.degree. C.

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patent: 4828936 (1989-05-01), Toma et al.

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