Anodizing and Dying Aluminum
Anodizing is an electrochemical process that converts the metal surface into
a decorative, durable, corrosion-resistant, anodic oxide finish. Aluminum is
ideally suited to anodizing, although other nonferrous metals, such as
magnesium and titanium, also can be anodized.
The anodic oxide structure
originates from the aluminum substrate and is composed entirely of aluminum
oxide. This aluminum oxide is not applied to the surface like paint or
plating, but is fully integrated with the underlying aluminum substrate, so
it cannot chip or peel. It has a highly ordered, porous structure that
allows for secondary processes such as coloring and sealing.
accomplished by immersing the aluminum into an acid electrolyte bath and
passing an electric current through the medium. A cathode is mounted to the
inside of the anodizing tank; the aluminum acts as an anode, so that oxygen
ions are released from the electrolyte to combine with the aluminum atoms at
the surface of the part being anodized. Anodizing is, therefore, a matter of
highly controlled oxidation—the enhancement of a naturally occurring
Mossberg 500 aluminum receiver, badly worn and scarred.
Receiver in the bead blaster for surface prep.
Anodizing set up. Astron power supply and acid bath.
Receiver suspended in a 15% sulfuric acid bath.
Dying the receiver at 100 degrees for 15 minutes.
Boiling the dyed piece for 30 minutes.
Anodized and ready for re-assembly.
Mossberg 835 (rear) and Mossberg 500 receivers completed.
Another view of the finished, anodized and dyed shot gun receivers.