MAGNESIUM‐LITHIUM binary alloys which contain just enough lithium (about 11 wt.%) to produce a single‐phase, body‐centred cubic structure have shown surprisingly good resistance to corrosion in 3% salt solution. High‐strength alloys having about 9% lithium and various quantities of aluminium, zinc and other elements have a mixed hexagonal‐plus‐body‐centred cubic structure. Such alloys generally have poorer corrosion resistance than the single‐phase binaries. Three of the high‐strength alloys were exposed for 32 months to the sea‐coast atmosphere near Daytona Beach, Florida. For comparison purposes, samples of commercial AZ31A‐H24 alloy were exposed at the same time. All alloys were in the form of 4 × 6 × 0.064 in. panels. The AZ31A sheet had corrosion resistance only slightly superior to that of an alloy containing Mg‐8.7%, Li‐5%, Al‐8%, Zn. The other two alloys, Mg‐8.8%, Li‐7%, Al‐0.05%, Sn‐1%, Mn, and Mg‐8.8%, Li‐7%, Al‐1%, Sn, had much poorer corrosion resistance.
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