Magnesium alloys high-purity

J. E. HiUis and R. N. Reichek, High Purity Magnesium dTM60 Alloy The Critical Contaminant Eimits and the Salt Water Corrosion Peformance, paper 860288, International Congress and Exposition of the Society of Automotive Engineers, Detroit, Mich., 1986. 

Fig. 4.17 Samples of high-purity AZ31 (upper photographs) and ZW3 (lower photographs) magnesium-base alloys, fitted with mild-steel nuts and bolts and exposed to a variety of corrosion conditions, (a) 4-S hours immersion in 37 salt soln., (b) 180 days immersion in distilled water, (c) 4 days immersion in borehole water, (d) 180 days in humidity cabinet sea-water spray and (e) 180 days atmospheric exposure...

Hillis, Reichek High Purity AM60 Magnesium Alloy, SAE Detroit Congress Feb. 26 (1986)... 

The special high-purity zinc (99-99%) is used mainly for the production of diecasting alloys containing 4% aluminium and 0 -04% magnesium and some-times I % copper, as shown in Table 4.30, which gives the composition of the two alloys laid down by BS 1004 1972, and of some newer zinc alloys. 

Argon [7440-37-1] -in magnesium manufacture [MAGNESIUM AND MAGNESIUM ALLOYS] (Vol 15) -as semiconductor bulk gases [HIGH PURITY GASES] (Supplement)... 

Clad Alloys. The heat-treatable alloys, in which copper or zinc are major alloying constituents, are less resistant to corrosive attack than a majority of the non-heat-treatable alloys. To increase the corrosion resistance of these alloys in sheet and plate form, they are often clad with a high-purity aluminum, a low-magnesium-silicon alloy, or an aluminum alloy containing 1% zinc. 

Salt re-melting Re-melting of Mg scrap under a salt cover. Is applicable to the processing of all scrap classes except used fluxes and sludge (not treated). If only class 1 - 2 scrap is used, HP (high purity) magnesium alloys may be produced. 

In principle, the aluminum-containing alloys of magnesium should all be capable of providing corrosion peiform-ance competitive with that established for high-purity alloys AZ91D and AZ91E in die cast and sand cast applications (i.e., <0.25 mm/yr (10 mpy) in ASTM B 117 salt spray), if the critical contaminants are controlled at appropriate levels [9,17]. 

Hillis, J. E., Murray, R. W., and Mercer, W. E., II, Compositional Requirements for Quality Performance with High Purity Magnesium Alloys, Proceedings of the International Magnesium Association, San Diego, 1998, pp. 74-81. 

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