Type II decorative and Type III hardcoat anodising on aluminium components to MIL-A-8625, from 5 to 100 micrometres. Clear and dyed colours, with thickness measurement and post-coating dimensional checks.
Anodising grows an oxide layer out of the aluminium itself, so it cannot peel like paint. The two common types differ in thickness, hardness and purpose.
Specify Type III only on surfaces that see wear. Hardcoating a whole decorative part adds cost and limits colour for no functional gain.
Roughly half the coating grows outward and half penetrates inward. On precision parts that matters, because a 50 µm hardcoat adds about 25 µm to every surface.
State on the drawing whether dimensions apply before or after anodising. Ambiguity here is the most common cause of rejected anodised parts.
On specifications: the capabilities above reflect standard specifications for this process. Achievable tolerances and finishes for your part depend on geometry, material and quantity, and are confirmed at quotation after drawing review. Every first article ships with a full dimensional inspection report against your drawing, plus Material Test Certificates for the raw material. We do not ask buyers to take a capability claim on trust.
Anodising is normally supplied as part of a machined or fabricated component order, under the HS code for that component.
MOQ is discussed at order stage based on part complexity and material. Payment by advance TT, LC at sight, or DP/DA case by case.
Type II is sulphuric acid anodising at 5 to 25 micrometres, used for decoration and general protection in a wide range of dyed colours. Type III hardcoat runs 25 to 100 micrometres, is much harder and more wear resistant, and is used on sliding and wear surfaces. Specify Type III only where wear actually occurs.
Yes. Roughly half the coating grows outward and half penetrates inward, so a 50 micrometre hardcoat adds about 25 micrometres to each surface. On precision parts, threads and bores must be masked or machined to allow for the coating. State on the drawing whether dimensions apply before or after anodising.
The 6000 series, such as 6061, 6082 and 6063, give the most even and consistent finish. 2024 and 7075 anodise acceptably but colour is less uniform. High-silicon casting alloys anodise poorly, giving grey and patchy results, so consider powder coating for those.
Clear, black, red, blue, gold and a wide range of others with Type II. Hardcoat Type III is darker and offers a more limited range. Colour is approved against an agreed physical sample, since dye uptake varies between alloys and batches.
No. Anodising works on aluminium, titanium and magnesium, where the oxide layer grows from the base metal. For steel, the equivalent protective options are zinc plating, nickel plating or powder coating.
MIL-A-8625 covers Types II and III and is widely used internationally, and ISO 7599 is the equivalent general standard. Specify the standard, type and class on the drawing, along with thickness and colour.
Technical drawings welcome. FOB or CIF pricing within 24 hours. Third-party inspection available.
Technical drawings welcome. FOB or CIF pricing, samples available.
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