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AssigneeGM Global Technology Operations LLC
InventorsMridula D. Bharadwaj, Suresh Sundarraj, Shashank Tiwari, Aihua A. Luo, Deepika Sachdeva
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A method of improving the corrosion resistance of magnesium alloy castings containing more than about 2 per cent by weight of aluminum is described. The method comprises: first selecting a casting process suitable for developing at least on the surface of the casting a microstructure comprising aluminum-depleted magnesium grains surrounded by an aluminum-rich layer and preferably incorporating at least some of an intermetallic compound based on the composition Mg17Al12; and second, heat treating at least the outer layer of the casting to promote additional intermetallic compound precipitation as required.
A method of improving the corrosion behavior of magnesium alloy castings comprising an average composition of more than about 2 per cent by weight of aluminum, by developing a microstructure in which regions of varying aluminum content are functionally arranged to impart improved corrosion resistance, the method comprising:
A method of imparting a predetermined level of corrosion resistance to magnesium alloy castings comprising aluminum as a major alloying element, by development of a microstructure comprising an at least partially continuous network of a magnesium-containing intermetallic compound which at least partially encloses regions of a magnesium-rich solid solution, the method comprising:
An aluminum-containing magnesium alloy article of specified average aluminum concentration heat treated to develop a microstructure comprising an at least partially continuous network of a magnesium-containing intermetallic compound which at least partially encloses regions of a magnesium-rich solid solution and thereby impart enhanced corrosion protection to the article.
Dependencies are inferred from the claim text.