Secoa Metal Finishing

How Does Anodizing Work?

How Does Anodizing Work?

Anodizing is a popular metal finishing process often used to coat aluminum, though it can be used on other substrates, as well. It is an electrochemical process that results in the formation of a tough oxide surface layer. This process can be broken down into five simple steps

1- The anodizing process begins when an aluminum part is connected to a positive terminal of an electrical circuit (which causes the part to become an anode)

2- The second step in the anodizing process is creating a cathode. While an anode is the positive part of the circuit, the cathode is the negative part of the circuit. This step is achieved by applying a negative charge to the metal plates.

3- Next, the aluminum part (which is now an anode) and the metal plates that comprise the cathode are submerged in an acidic electrolyte bath solution. This solution contains a variety of chemical compounds that add positive and negative ions to the bath.

4- Then, once the aluminum part is submerged in the solution, the cathode is applied to a metal electrode in the bath, which sends voltage through the circuit.

5- When voltage is applied to the circuit, the aluminum part loses positive ions while attracting negative ions. This causes a layer of aluminum oxide to grow on the part’s surface.

The anodizing process makes metal surfaces more durable and corrosion resistant, which makes it useful for applications in a wide array of industries, ranging from architectural to automotive. Looking for anodizing services in Georgia? Contact Secoa Metal Finishing at (706) 383-2893 or