Chemical Conversion Coat (Chem Film)

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Definition and Function

Chemical conversion coating (Chem Film) is a thin protective layer formed on the metal surface through a chemical reaction. It enhances the corrosion resistance of metals while maintaining good electrical conductivity. This coating is free of hexavalent chromium and complies with MIL-DTL-5541 Type II as well as environmental regulations such as RoHS.

Colors

Transparent

Light Gold

Typically light gold or transparent.

The coating is extremely thin and has minimal impact on the appearance or dimensions of parts.

Example of a bead-milled + anodized colored part

Technical Properties

Corrosion Resistance	Electrical Conductivity	Dimensional Impact	Applicable Materials
Significantly improves the protection of aluminum and its alloys	Maintains good conductivity of the metal surface	Extremely thin layer, minimal effect on part dimensions	Aluminum and aluminum alloys, some magnesium alloys, and other metals

Applicable Materials

Metals: Aluminum

Process Characteristics

Very thin coating thickness, approximately 0.00001”–0.00004”

Environmentally friendly and chromium-free

Forms a dense protective layer on the metal surface

Compatible as a base for subsequent painting, coating, or bonding processes