The choice of finish for an extruded component depends upon a number of factors, most notably the desired appearance and the product's in-use environment. Aluminum is naturally protected from many environmental stresses, as a protective oxide coating naturally begins to form upon exposure of the unfinished aluminum to the atmosphere. For many applications, extrusions require no more protection than this, transparent oxide film.
Aluminum extrusions can be finished with a variety of paint, anodize or mechanical treatments when additional surface protection or an enhanced appearance is desired.
1/15/2017 » 1/17/2017
Platts Aluminum Symposium 2017