The Process of Industrial Anodizing for Aluminum Explained

by | Apr 24, 2018 | Metal Finishing

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Through the process of aluminum anodizing, a layer of oxide is formed on the surface of an aluminum metal and as a result, the corrosion resistance of that metal is increased. This industrial anodizing process provides excellent corrosion resistance.

Producing an Oxide Protective Coating
An oxide protective coating is developed through electrolytic means during this process. The actual process is as follows:

To start off with, and aluminum metal part is put into a bath consisting of an electrolytic solution that also has a cathode. A current is then placed into the solution. This brings about the production of hydrogen from the cathode which also begins the formation of oxygen upon the surface of the anode. Subsequently, the surface of the treated part develops a metal oxide film.

The industrial anodizing process involving aluminum can produce an oxide layer thickness on an aluminum part that is actually 100 times thicker than what would occur if the part was only naturally exposed to oxygen.

The parts that are treated through this process develop high resistance to corrosion and wearing – a condition that can occur when two moving parts rub together.

The operating service lives of aluminum parts that are anodized are longer than those which have not been anodized.

Aluminum Anodized
Through the aluminum anodizing process, glues and paints can obtain better surface adhesion capabilities. This increased adhesion occurs as a result of the pores that exist in the protective oxide layer.

Industrial anodizing is a common process used on aluminum and aluminum alloys. There are, however, other metals such as magnesium, zinc, and titanium which may also benefit from this process of anodizing.

Various methods of anodizing are available based on the type of electrolytic solution used in the process. This solution that was once most commonly used in the anodizing process has changed. In the past, chromic acid was the solution of choice to be applied for the protection of components and parts in commercial operations. The common electrolytic solution used today is sulfuric acid.

If you need anodizing for your aluminum parts and equipment, be sure to contact an experienced industrial aluminum anodizing and coatings company for more information.