Formation of a protective outer layer on magnesium alloys contai

Details Formation of a protective outer layer on magnesium alloys contai Formation of a protective outer layer on magnesium alloys contai

1985-11-25

1987-04-21

Herbert, Thomas J.

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148 131, 427 37, 427377, 4274192, 427435, 427437, 428701, B32B 1504

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active

046596291

ABSTRACT:
A process is disclosed for the protection of magnesium based alloys containing aluminum by treatment with eutectic mixtures of fused salts to provide a corrosion resistant outer layer on the magnesium based alloy. A suitable fused salt mixture comprises urea and at least one of ammonium nitrate or ammonium nitrite. A magnesium based alloy is also disclosed comprising magnesium and aluminum having a corrosion resistant outer layer comprising magnesium oxide and aluminum oxide; the proportion of aluminum present in the outer layer being enriched in proportion to the amount present in the magnesium based alloy.

REFERENCES:
patent: 2036563 (1936-04-01), Beck
patent: 3926696 (1975-12-01), Klunsch et al.
D. Lovering et al, (2), Abstract No. 792, Extended Abstracts of the Electrochemical Soc. 83-1, Pennington, N.J., p. 1169.
Turner et al., Anodizing Aluminum in Molten Nitrates, Transactions of the Institute of Metal Finishing, pp. 109-115, May 1980.

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