Anodizing Services

ISO 9001

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Machining & Finishing

Simplified Sourcing

Anodizing for Prototyping
and Production

Anodizing Standards

*Type in Parenthesis

MIl-PRF-8625 (IA)

MIl-PRF-8625 (IB)

MIl-PRF-8625 (IC)



ASTM D1730



AAMA 611-98 (A4)

AAMA 611-98(A3)

ASTM D3933-98


Self-Serve Options on Platform

Standard Type Composition Application Examples
MIL-PRF-8625 Type II Sulfuric Acid Good for hardness and resistance to abrasion, such as optical components and hydraulic valve bodies
MIL-PRF-8625 Type III
(w/ PTFE available)
Sulfuric Acid (Hard Coat) Cookware; Good thermal resistance, electrical insulation, abrasion/wear resistance, and strong finish
Class Designations apply to Sealing: Class 1, non dyed; Class 2, dyed, color to be specified.

Available Through RFQ Only

Standard Type Composition Application Examples
ASTM D1730 Type 2, Method 1
(MIL-A-8625 equiv.)Zn
Sulfuric Acid Anodized finishes requiring dyeing, saltwater resistance, kitchen appliances
ASTM B580, type
A equiv to hard coat
AKA Type III Sulfuric Acid (Hard Coat) Cookware; Good thermal resistance, electrical insulation, abrasion/wear resistance, and strong finish
SAE AMS2469J equiv to
hard coat
AKA Type III Sulfuric Acid (Hard Coat) Cookware; Good thermal resistance, electrical insulation, abrasion/wear resistance, and strong finish
AAMA 611-98 Class I (A4) Sulfuric Acid Aerospace parts requiring high performance architectural aluminum anodic coating; kitchen applicances
AAMA 611-98 Class II (A3) Sulfuric Acid General use commercial architectural anodic coating
ASTM D3933-98 N/A Phosphoric Acid Structural adhesive bonding; aerospace parts
ASTM B580 Type G (MIL-A-8625
Type I equiv.)
Chromic Acid Provides a good surface for paint and adhesive bonding
MIL-PRF-8625 Type IA Conventional Chromic Acid Paint primer for aerospace parts
MIL-PRF-8625 Type IB Low Voltage Chromic Acid Modified Type I used for 7XXX series aluminum alloys
MIL-PRF-8625 Type IC Non-Chromic Acid Electrolyete Improves paint adhesion and fatigue resistance
*May increase quote time, lead times, and costs

Standard Color Options


Type II, Type III, Type III + PTFE


Type II, Type III


Type II


Type II


Type II

*Custom colors available, upon request

What is Anodizing?

Anodizing is a conversion coating process that involves immersing aluminum into an acid electrolyte bath and passing an electric current through it. This creates a robust and fully integrated coating of aluminum oxide on the surface of the aluminum, replacing the naturally occurring oxide layer and penetrating through to the base metal. Unlike paint, anodizing doesn’t chip or flake.

Benefits of Anodizing:

Durability (wear resistance)

Abrasion resistance

Increased hardness

Corrosion protection



Desirable electrical properties

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Anodize vs Alodine

Alodine, a chemical conversion coating, also known as "chem film," is a thinner conversion coating that is conductive and is commonly used in conjunction with masking in anodized parts. In contrast, anodizing is a thicker coating created by immersion with electrical current. Chem film is an excellent base primer for paints and provides corrosion protection. MIL-DTL-5541 is the common military specification for chemical conversion coating.

Coating Thickness vs Build-up

Part of the anodizing process is to remove the naturally occurring oxide layer, in a process called deoxidizing, by immersing the parts in an acidic solution. The electrochemically formed oxide layer is thicker than the naturally occurring oxide layer. Therefore, the build-up is actually less than the coating thickness, or the actual dimensional growth is less than the thickness of the anodized oxide layer.  Here are the terms commonly utilized in anodizing and you can see these in more detail in the image below:


Masking for Anodizing

Your parts may require masking, if you have tight tolerances on your threads or holes. This may even be applicable for a thinner, Type II MIl-PRF-8625 coating. Masking may be accomplished with plastic plugs, tape, or even painted-on liquid plastics. Masking should be called out on a drawing with notes. If you have questions about masking or plugging, contact one of our experts today.

Fictiv also offers other finishes for your machined parts, including:


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