High corrosion resistance, especially to seawater and marine atmospheres,
High corrosion resistance, especially to seawater and marine atmospheres, is the primary advantage of castings made of Al- Mg alloys. Best corrosion resistance requires low impurity content (both solid and gaseous) , and thus alloys must be prepared from high- quality metals and handled with great care in the foundry. The relatively poor castability of Al- Mg alloys and the tendency of the magnesium to oxidize increase handling difficulties and, therefore, cost.
