Black Anodizing
Black anodizing is aluminium anodizing finished with a black dye (or integral colour) to give a uniform, durable black surface. It combines the corrosion resistance of anodizing with a non-reflective finish for optics, electronics and premium products.
What it is
Parts are anodized, usually Type II at 10–25 µm, then immersed in a black dye that is absorbed into the porous oxide before sealing. The colour is part of the surface layer, not a coating on top, so it will not chip like paint.
Hard-anodized parts can also be dyed black for a deep, wear-resistant black finish.
Typical applications
- Camera, optical and laser equipment (low reflectance)
- Electronics enclosures and heat sinks
- Automation, robotics and machine parts
- Consumer products and premium hardware
Suitable materials
- 6061 and 6063 (best, most uniform black)
- 7075 and 6082
- Low-silicon cast alloys
Points to consider
- Organic black dyes can slowly fade in strong sunlight; specify UV-stable dye for outdoor parts.
- Bead blasting before anodizing gives a uniform matte black and hides tool marks.
- Different alloys can come out slightly different shades of black; keep parts in one alloy where appearance matters.
- Mask threads or contact points as needed.
Frequently asked questions
Does black anodizing fade?
Indoors it lasts very well. Outdoors, standard organic dyes can fade over time in direct sunlight; UV-stable or electrolytic colouring performs better.
Why do some black anodized parts look purple or brown?
This usually comes from the alloy, insufficient coating thickness or dye absorption. Correct thickness and alloy choice give a true, deep black.
Is black anodizing conductive?
No. Anodizing is electrically insulating, so any grounding points should be masked or machined after anodizing.