Alodine / Chem Film for Architectural Metal Finishing

About Alodine

Alodine, also commonly known as chem film, is a chromate conversion coating that is used to prepare aluminum surfaces for the application of an architectural metal finishing product. Before the aluminum can receive the metal finishing, it should always be given the proper chem film treatment to ensure that the coating will be able to form a powerful bond with the metal surface and avoid a premature failure of the bond. When Alodine has been used prior to applying Kynar® or another type of metal finishing product, the resulting coat has excellent qualities of adhesion and durability.

How does chem film work?

As a chemical conversion coating, Alodine works to fundamentally change the chemical properties of the surface, making it less susceptible to corrosion and more capable of bonding with a metal finishing product. The pretreatment achieves these ends through a process known as passivation, in which the metal surface is made less prone to be affected by oxidation by the elements including, water and air. Aluminum that has been treated with chem film is far less likely to rust over time, and can therefore be expected to last far longer.

Benefits of Alodine / Chem Film

Alodine offers major advantages over other types of passivation techniques. For example, anodizing creates a far thicker oxide coating on the surface of the object. While this may be desirable in terms of durability, it also increases the volume of the object and changes its dimensions; for example, screw holes will be smaller, so the item may no longer fit with its neighboring components. Another benefit of chem film is that it does not inhibit electrical conductivity in parts that are required to pass a current.

When is Alodine used?

Chem film may be applied by dipping, spraying, or brushing, depending on the size and shape of the object. It is not a decorative coating but instead is used entirely for its protective and priming qualities prior to applying a metal finish. It is widely used in a number of different types of applications, including marine finish, and for military, aviation and industrial uses, among others. To learn more about Alodine, contact us at Certified Enameling, Inc. and request a quote for your project.

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Certified Enameling, Inc. - Architectural Metal Finishing
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