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Plating Magnesium AZ91D for corrosion resistance, EMI shielding and decorative


(2001)

We are looking for ways and methods that are available in the industries to plate or coat Magnesium AZ91D for corrosion resistance, EMI shielding and decorative. Main application: microelectronics and mobile phone.

Chua Kok Siong
NTU - Singapore, Singapore


(2001)

One cannot plate magnesium out of aqueous solutions. The oxidation potential of the magnesium is too large. Clean magnesium will react slowly with water (mag wheels and mag parts are actually alloyed). You can try a dipping process.

Anthony Xidis
- Minneapolis, Minnesota


(2003)

AZ91D is used as diecast, so that has much micro pin hole during die casting process. The cast is observed as sponge structure by electron microscope. The porous structure is easy attacked by chemical in plating or aquatic phosphate treatment etc.

If you want to prevent the corrosion problems, should get sound structure. You can check by gravity measurement or by microstructure.

In my experience, the rolled sheet or extruded plate are better than diecast. For example, AZ31B or AM20 etc.

Simon KangHyung Kim
- Suwon, Kyungki, South Korea



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