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Chromate conversion coating is a chemical process applied to aluminum, zinc, and their alloys, where a thin, protective layer of chromate is formed on the surface. This process involves treating the metal with an acidic chromate solution, which results in the formation of a yellow, iridescent, or clear finish depending on the specific chromate treatment used. The coating enhances corrosion resistance, abrasion resistance, and adhesion properties, while also improving paint adhesion for subsequent coating layers. Chromate conversion coatings typically have a thickness ranging from 0.0002 to 0.0005 inches (0.005 to 0.012 mm), and surface roughness values can vary but are generally in the 0.2 to 0.8 µm Ra range. This finish also reduces the risk of galvanic corrosion when metals are in contact with other materials. The coating process is environmentally sensitive, with hexavalent chromium being a concern in some formulations, although alternative, environmentally friendly chromate options are now available. Chromate conversion coatings are commonly used aerospace,automotive, and military applications due to their superior protective properties.
Primarily used on aluminum and its alloys, aluminum (7xxx series not recommended).
As machined (Ra 3.2μm / Ra 126μin), Bead blasted (Glass beads #120)
Yellow, gold, or clear iridescent finish.
Available in clear (Class 3) and decorative finishes.
Typically 0.00001" to 0.00004" (very thin).
Smooth, matching the base material’s finish.
6061 T6, 6082, 7075-T6, 5083-H111, 6063, 5052, 2024-T351, 7050, 2017A, 6082-T651, 7075-T651, 2014, 6061-T651, 7075-T7351, 6082-T6, 2014-T6, 6063-T5, 6063-T6, 5083-H32, 5052-H32
A2 Tool steel, D2 Tool steel, A3 Tool Steel, O1 Tool Steel, S7 Tool Steel, H13 Tool Steel
932 Bearing Bronze , 954 Bearing Bronze, 544 Bearing Bronze
It is tested using salt spray testing (ASTM B117) to evaluate corrosion resistance.
Anodizing creates a thicker, harder oxide layer, whereas chromate conversion forms a thin, self-healing protective film with better conductivity.
The coating is typically 0.00001 to 0.00004 inches (0.25 to 1.0 µm) thick, making it ideal for precision components.