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Chromate conversion coating services

Chromate conversion coating, more commonly known as chem film or by its brand name Alodine, is a type of conversion coating, used on aluminum as a corrosion inhibitor, as a primer for paint due to increased adherence or to preserve electrical conductivity.

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Surface preparation Colors Applicable materials Cosmetic availability Visual appearance
As machined (Ra 3.2μm / Ra 126μin) Clear Aluminum No Machining marks are visible

Example of a chromate conversion coated part

Example of a chromate conversion coating part
Example of a chromate conversion coating part

The Hubs chromate conversion coating process

Chromate conversion coating is a chemical coating that protects aluminum from corrosion, serves as a primer for painting and preserves electrical conductivity. At Hubs, we only use chromium-free, RoHS compliant clear chromate conversion coating. 

Here’s how Hubs operators apply chromate conversion coating:

  • Parts are cleaned and degreased to remove any contaminant

  • Parts are then rinsed to eliminate any residue of detergent

  • Conversion coating is then applied by immersing the aluminum parts in the tank. The chromate conversion coating gets applied immediately

  • Parts are then rinsed again

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