There are several different options that can be used in finishing different types of aluminum alloys. While aluminum is naturally resistant to corrosion and rust, the use of anodizing processes, even on durable AA5083 –cast CT & J plate, is an important consideration for many parts, components, and applications.
The Purpose
The purpose of anodizing for AA5083 –cast CT & J plate or any other aluminum alloy and form is to create an additional, thick and protective layer of aluminum oxide. This layer of aluminum oxide is even more resistant to corrosion than the natural protective layer that will form over time on the surface.
Additionally, once the aluminum as gone through the anodization process the result is a surface that is more resistant to abrasion. This is an essential consideration in any type of application from molds to jigs and specific components. When the surface is more resistant to marring or scratches, there is decreased the risk of abraded areas on the surface creating problems, particularly in molds and jigs.
The Process
Before anodizing, the AA5083 –cast CT & J plate will go through grinding or polishing operations. These are known as the mechanical finishing operations, creating a smooth surface and edge free from burrs or irregularities. The smoothing operations are essential as the anodizing doesn’t alter the surface in any way.
Anodizing exposes the AA5083 cast plate to a sulfuric acid electrolyte solution at a specific temperature and for a specific amount of time. The parameters for the process are set to allow for precise control of the thickness of the aluminum oxide layer that is formed.
In addition to anodizing, there are hard coatings and electroplating options that can also be used on cast aluminum plate to form a protective surface. Understanding the options and the results you can expect will be important in choosing the right finishing for any application.
