http://www.ysxbcn.com/down/upfile/soft/200969/02-p0517.pdf

Comparison of corrosion behaviors of AZ31, AZ91, AM60 and ZK60 magnesium alloys

The growth rate of magnesium casting production in North America has averaged 16.6 percent per year over the last ten years.1−3 The fastest growing application for magnesium is the high-pressure die casting for automotive components, which represents approximately 70–80% of the magnesium casting shipments in recent years. This paper presents the latest developments in magnesium alloys, product design, casting technology, surface finishing, and magnesium-matrix composites. Current and future automotive applications of magnesium castings are also discussed.

Magnesium castings for automotive applications

Formation mechanism of pulse current anodized film on AZ91D Mg alloy

The dehydration of MgCl2·6H2O in MgCl2·6H2O–KCl–NH4Cl system

Taking the saline lake bischofite and NH4Cl that was removed with the ammonia method and continuously followed by filtration as raw materials with a molar ratio of 1:1 of MgCl2 to NH4Cl, ammonium carnallite was synthesized. And then the ammonium carnallite was dehydrated to some extent at 160℃ for 4h. Ammonium carnallite reacted with ammonia at 240℃ for 150mm and the ammonation ammonium carnallite was produced. Finally, the ammonation ammonium carnallite was calcined at 750℃ into anhydrous magnesium chloride containing only 0.1%(mass fraction) of MgO. On the other hand, dehydrated ammonium carnallite was mixed with the solid ammonium chloride at mass ratio 1:4 at high temperature and with the differential pressure of NH3 above 30.5kPa. The dehydrated ammonium carnallite of mixture was dehydrated at 410℃, and then calcined at 700℃ into an- hydrous magnesium chloride with only 0.087% (mass fraction) of MgO. X-ray diffraction and electron microscopy analysis results prove that anhydrous magnesium chloride obtained by both methods hasn't mixed phases, the particle is large and even has good dispersion, which is suitable for preparation of metal magnesium in the electrolysis.

J. Davis

Papers

High ductility magnesium alloys in automotive applications