SURFACE FINISHING
Alodine
Alodine coating (Chem Film) refers to creating a small, protective, thin layer on the surface of substrate material using a solution containing chromium ions.
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Introduction
Alodine (Also called Chromate conversion coating) refers to creating a small protective thin layer on the surface of substrate material using a solution containing chromium ions. The layer protects from corrosion and also provides aesthetic appeal with greenish-gold color.
It is a low-cost surface finishing approach to the parts with aluminum and their alloys. Parts are immersed into the bath for the coating, which is a rapid process applicable to complex components.
key properties
| Features | Info |
|---|---|
| Materials | Aluminum |
| Color | Clear, gold |
| Texture | n/a |
| Applications | Tools, hardware, electrical systems |
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Make substrate preparation and downstream paint/bonding intent visible
Conversion coatings are often used to prepare aluminum for corrosion protection, paint adhesion or electrical-contact requirements. Define the substrate alloy, surface preparation, conversion process class if specified, masked areas and the next process in the sequence.
Engineering data to lock before release
| Substrate condition | Alloy, surface state and cleaning/preparation requirement |
|---|---|
| Functional purpose | Paint adhesion, corrosion support or electrical contact |
| Sequence data | Conversion coat before paint, bonding or assembly |
| Acceptance | Coverage, visual condition and agreed test/record |
Pretreatment and subsequent process sequence can govern performance as much as the conversion coating name itself.
