Conversion coating is a process that produces and aluminum chromate on the surface of properly prepared aluminum to enhance the corrosion resistance and paintability of aluminum surfaces. Conversion coatings offer an economical way to impart corrosion resistance to aluminum as compared to anodizing.

Conversion coatings result in little or no dimensional change. The coating is soft and susceptible to damage when it if first deposited. After the coating has cured is if quite tough. The coating will resist normal wear, any pressure or force that is tough enough to damage the aluminum will damage the conversion coating. The hardness and abrasion resistance of the base material is not affected by the chemical conversion coating.

Aluminum will oxidize if unprotected. The oxide is formed very quickly when aluminum is exposed to air. The rate of corrosion will increase with increases in humidity. To prevent this type of corrosion a chemical conversion coating is a great choice.

As a base for paint the chromate conversion coating will improve adhesion and protect the base material in the event of damage to the paint. The chromate conversion process is self healing to a point and will continue to offer protection when small scratches are present.

The coating is typically yellow but can be made to be dark brown or clear. The clear coatings can b deposited with solutions that will result in a coating that is ROHS compliant. This is very important for some applications.