1. Mg is too soft (poor mechanical properties). 

2. Mg is highly reactive 

In case you are interested on generically comparing their corrosion behaviour, the signalled references may help: http://www.asminternational.org/documents/10192/3456792/06787G_Sample.pdf/c4151917-99fc-46e8-a310-d5578d0af160 http://www.sciencedirect.com/science/article/pii/S0010938X09001760

Dear Hossein Mahtabpour,

Compare Section 6.2 to Section 6.4 in Reference below.

Materials Science in Design and Engineering, Delft NL, 2012.

http://www.delftacademicpress.nl/m017.php

Adding to all mentioned above, forming of Mg and its alloys at low working temperatures is difficult due to limited slip systems. To resolve this issue, deformation must be carried out at relatively high temperatures, or the grain structure has to be extensively refined to promote other deformation mechanisms, e.g. grain boundary sliding.

Dear Hossein Mahtabpour,

To add on:- Please see (might be helpful):- (1) https://en.wikipedia.org/wiki/Magnesium_alloy  (2) RG link: https://www.researchgate.net/publication/242181254_Development_of_Manufacturing_Process_of_Wrought_Magnesium_Alloy_Sheets_by_Twin_Roll_Casting (3) Magnesium Technology 2016, edited by Alok Singh, Kiran Solanki, Michele V. Manuel, Neale R. Neelameggham, Wiley-TMS. (4) "Light Alloys: Metallurgy of the Light Metals", by Ian Polmear, David StJohn, Jian-Feng Nie, Ma Qian, Butterworth- Heinemann, 2017.

Best wishes

Article Development of Manufacturing Process of Wrought Magnesium Al...