Ingot cast magnesium alloys with improved corrosion resistance

Details Ingot cast magnesium alloys with improved corrosion resistance Ingot cast magnesium alloys with improved corrosion resistance

1988-03-07

1990-03-13

Mc Dowell, Robert

Alloys or metallic compositions

Magnesium base

Lanthanide containing

420408, 420409, C22C 2302

Patent

active

049081810

ABSTRACT:
A magnesium alloy consists essentially of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium, and yttrium, "a" ranges from about 0 to 15 atom percent, "b" ranges from about 0 to 4 atom percent, and "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. Second phase particles contained by the alloy are less susceptible to corrosion attack. Articles produced from the alloy have superior corrosion resistance and mechanical properties comparable to those made from commercial magnesium alloys. Such articles are suitable for application as structural members in helicopters, air frames, such as gear box housings, where good corrosion resistance in combination with low density and good strength are required.

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Industry's Lightest Structural Metal, Dow Chemical Company, Midland, Mich., pp. 2-15.
J. D. Hanawalt, C. E. Nelson, J. A. Peloubet, "Corrosion Studies of Magnesium and its Alloys", Trans AIME, 147, (1942), pp. 273-299.
J. E. Hillis, K. N. Reichek, K. J. Clark, "Controlling the Salt Water Corrosion Performance of Magnesium AZ91 Alloy in High and Low Pressure Cast Form", Recent Advances In Magnesium Technology, American Foundrymen's Society, Inc. (1986), pp. 87-106.

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