Type II black anodize

Black Anodized Aluminum

Black anodize is the same Type II oxide film as clear — with black dye locked into the pores before sealing. It's the most-specified cosmetic finish in precision hardware, and the most stable color anodizing can produce.

We machine and anodize as one process, which is what makes 'all the parts match' an outcome you can order rather than hope for.

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What this finish is

Dye in the pores, sealed for life

After the anodic film grows, its porous structure absorbs dye; hot sealing then closes the pores over the pigment. Because the color sits inside a ceramic-hard oxide rather than on top of the metal, black anodize doesn't chip, flake, or rub through the way coatings do.

Black is the production-stable anodize color: dense pigment loading makes it far more UV-resistant and batch-consistent than reds, blues, or golds. When a customer asks for a colored anodize that must still match in two years, black is the color we can promise.

Process & spec
Type II sulfuric anodize per MIL-A-8625, Class 2 (dyed); 10–15 µm typical for rich black.
Color depth
Surface prep decides the look — bead blast first for matte black, machined finish for satin gloss black.
UV stability
Black is the most fade-resistant anodize dye; bright colors fade outdoors, black holds.
Dimensional impact
Same as clear Type II: ~half the film per surface, usually negligible below ±0.02 mm.
Thermal note
Black anodize raises emissivity dramatically — a free radiative-cooling upgrade on housings and heat sinks.

Benefits

What black anodize delivers

Cosmetics are the headline, but half our black anodize orders are functional: reflections, emissivity, and contrast.

Reflection control

Matte black interiors kill stray light in camera bodies, lens mounts, and laser hardware — the optics-industry standard.

Premium product cosmetics

Bead blast plus black anodize is the finish language of high-end electronics and instruments.

Best color consistency

Among dyed finishes, black holds tone across batches better than any other color — critical for product families.

Higher thermal emissivity

Radiates heat far better than bare or clear-anodized aluminum — measurable gains on passively cooled enclosures.

Hides wear and fingerprints

Matte black disguises daily handling that shows immediately on bright finishes.

Crisp marking contrast

Laser marking through black anodize produces bright silver graphics — the cleanest legend system available.

Typical applications

Where black anodized parts dominate

Optics, consumer hardware, and anything photographed next to a brand logo.

Camera and optics hardware

Lens mounts, sensor housings, and cavity interiors where stray reflections are defects.

Consumer electronics enclosures

Machined housings and bezels in the blast-and-black recipe consumers read as premium.

Instrument front panels

Black panels with laser-marked silver legends — high contrast, permanent, glare-free.

Robotics and automation

Customer-facing cell hardware and vision-system surroundings where glare confuses cameras.

Medical device exteriors

Sealed black surfaces that survive disinfection while keeping device-brand cosmetics.

Defense and aerospace hardware

Non-reflective tooling and equipment surfaces with familiar MIL-spec callouts.

Design considerations

Designing for black anodize

Everything true of clear anodize applies — plus the color-management rules that keep black looking black.

Pick the texture deliberately

Machined + black = satin gloss; bead blast + black = uniform matte. Specify the prep, because it changes the product more than the dye does.

Batch visible sets together

Dye lots shift subtly. Parts that appear side by side should be machined and anodized as one lot — group the part numbers on the PO.

One alloy per visible assembly

Black hides alloy tone differences better than clear, but 2024 and castings still read differently at low angles — don't mix on one face.

Define the cosmetic standard

'No visible defects at 45 cm under office lighting' is inspectable; 'perfect black' is not. We agree boundary samples at FAI.

Plan racking and masking like clear

Rack witness marks, masked threads, and grounding lands all behave exactly as with clear anodize — approve locations up front.

Confirm UV exposure

Black holds outdoors; if someone upstream changed the spec to a bright dye color, flag sun exposure before committing.

Compatible aluminum grades

Alloy compatibility with black anodize

Black is the most forgiving anodize color across alloys — the dye covers what clear film reveals.

Alloy	Suitability	Engineering notes
6061-T6	Excellent	Deep, even black — the standard cosmetic combination
7075-T6	Very good	The safest cosmetic choice for 7075 — black hides its tonal cast
2024-T351	Good	Better cosmetic option than clear on 2024; still expect slight low-angle variation
5052-H32	Very good	Even black and durable — standard for outdoor electronics covers
MIC-6	Fair	Usable for color-coding tooling; mottle shows on large flat show faces

Comparing coatings instead? Return to the aluminum surface finishes hub or read the full anodized aluminum CNC machining guide.

Quote your black anodized parts

Send CAD with texture choice (machined or blasted), cosmetic grade, and the part numbers that must color-match. An engineer plans lots, masking, and racking with the quote — within one business day.