Secoa Metal Finishing

The Aluminum Anodizing Process

The Aluminum Anodizing Process

The corrosion resistance of aluminum is increased through a process called aluminum anodizing in which a layer of oxide is formed on the alloy’s surface. At Secoa Technology, we offer expertise in this process.

Anodizing Process Explained

The most popular method of enhancing the surface of aluminum is aluminum anodizing process. First the metal is placed into an electrolytic solution bath with a cathode. After current is applied to the solution, hydrogen comes forth from the cathode which results in oxygen being formed upon the surface of the anodic part. Subsequently, a metal oxide film grows on the treated part.

The type of anodizing process and the application involved can determine how thick of an oxide layer is grown on the aluminum part. Potentially, it can be as much as 100 times as thick as an oxide layer that would naturally develop on aluminum only exposed to oxygen.

Aluminum anodized parts have greater wear and corrosion resistance than parts that are not treated. In addition, they provide protection against the wear that results from the friction of two parts rubbing together, i.e. with threaded compliments – something which is referred to as galling.

Anodized parts, in general, have longer operating life spans than their non-anodized counterparts.

Anodized Aluminum

The process of anodizing aluminum enables better adhesion of glues and paints to the surface of the aluminum. The pores that exist in the protective oxide layer provide this improved surface adhesion capability.

Most commonly the process of anodizing is applied to aluminum and aluminum alloys. However, other metals such as sink, hafnium, titanium, and magnesium can also be protected by the anodizing process.

Various methods of anodizing are referred to and categorized by the electrolytic solution used in the process. For instance, at the inception of the use of this anodizing process chromic acid was the solution used in commercial facilities. However, today most commonly sulfuric acid is used as the electrolytic solution for anodizing.

You can count on our experienced team Secoa Technology to handle all of your aluminum anodizing requirements. To learn more, call us at (706) 272-0133.