Electrically conductive oxidation

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Definition and Function

Electrically conductive oxidation is a specialized anodizing process that controls the oxide film’s thickness, porosity, and chemical composition to maintain electrical conductivity while providing corrosion protection.
This process forms a thin, uniform conductive oxide layer on the surface of aluminum and aluminum alloys, preventing further oxidation while ensuring excellent electrical contact performance.
Commonly applied to components requiring grounding or conductivity, such as electronic housings, electrical connectors, and EMI shielding parts.

Colors

Light Gray/Dark Gray

Black

Brown

Typical colors: light gray, dark gray, black, or brown (depending on oxidation time and electrolyte parameters).

The appearance is darker than standard anodizing, with a metallic matte or semi-reflective finish.

Slight color variation between batches or different substrates is normal and acceptable.

Example of a bead-milled + anodized colored part

Electrically Conductive Oxidation 导电氧化示例3

Technical Properties

Applicable Materials	Burrs and Sharp Edges	Appearance	Tolerance	Electrical Conductivity	Corrosion Resistance	Post-processing
Metal materials, especially aluminum and aluminum alloys	Removed	Uniform conductive film with gray-to-black metallic tone	Minimal dimensional change due to the thin oxide layer; suitable for precision electrical assemblies	Surface resistivity ≤ 0.05 Ω·cm² (depending on process parameters)	Good for indoor electrical applications; enhanced resistance achievable with composite finishing	Suitable for direct electrical assembly, spot welding, threaded connections, or EMI shielding structures

Applicable Materials

Metals: Aluminum

Process Characteristics

The oxide layer is thin (typically 0.5–5 μm), ensuring good conductivity with uniform thickness and strong adhesion.

The surface exhibits low resistivity and provides reliable conductivity for grounding, electrical contact, or shielding purposes.

Unlike conventional anodizing, conductive oxidation does not involve sealing, in order to maintain electrical continuity.

Parts are mounted on racks during processing; minor rack marks may remain but are usually placed in inconspicuous locations after assembly.

The surface finish is smooth and refined, offering both functional and decorative qualities.