Galvalume is a coating consisting of zinc, aluminum and silicon that is used to protect a
metal (primarily steel) from oxidation. It is similar to galvanizing in that it is a sacrificial
metal coating which protects the base metal.
Galvalume is primarily used to protect iron-based alloys that are prone to rust.
Galvalume-coated steel is better able to resist oxidation than plain carbon steel because
the zinc and aluminum protect the underlying steel from the environment. The zinc also
will more readily oxidize than the steel it contacts. This is similar to galvanized steel.