The Lightness and Strength of Magnesium
The Corrosion Resistance of Aluminum
Magnesium weighs only one fifth the weight of steel
and is even one third lighter than aluminum! For many years,
magnesium was often perceived as being very susceptible to corrosion.
In reality, most alloys, when properly produced, can withstand
quite harsh environments. Admittedly, however, the ideal situation
would be a magnesium alloy which could compete with the corrosion
resistance of aluminum. The ideal has become reality.
In the early mid-1980's Wellman and Dow Chemical pioneered
the development of AZ9lE magnesium alloy for the sand
casting industry. This was the first magnesium sand casting alloy
confirmed to have corrosion resistance comparable to that of
many aluminum alloys. And we have the salt-fog corrosion testing
data to prove it.
Fansteel/Wellman Dynamics is currently the world's largest
producer of AZ9lE.
Due to its light weight, high strength, and vibration absorbtion,
magnesium is ideally suited to aerospace applications. Certain
alloys have been developed which retain their strength at elevated
temperatures typically found in these demanding roles. One such
alloy is WE43A.
Although it is very difficult to cast, from a design standpoint
WE43A has many advantages:
- High yield strength up to 400°F (204°C).
- Superior creep and fatigue strength at service temps.
- Excellent corrosion characteristics.
- Castings are pressure tight and weldable.
Contact our engineering department for more information on
these two alloys.