Chromic acid anodising
Chromic acid anodising is an alternative to sulfuric acid anodising, which is used when a coating with great corrosion durability and good adhesiveness is desired.
- Particularly well-suited for aluminum subjects with lots of cavities, studs and the like, as chromic acid residue does not attack the metal like sulfuric acid does.
- Very well-suited as pre-treatment for bonding and finishing, because of the good adhesiveness and corrosion durability.
Structure and look after the treatment
- The metallic impression is maintained.
- The anodising layer is transparent.
- The colour turns light grey.
- 2-5 µm
- The coating appears in different grey shades depending on the alloy.
- Can be dyed in different dark colours.
- The coating is sealed in hot water, if it needs further surface treatment.
- Most alloys can be used.
- Cast alloys should not be used.
- Alloys containing more than 5 % copper should not be used.
- As pre-treatment for finish and bonding the coating should not be sealed.