Black Oxide Coating Service

Black oxide coating provides a durable, corrosion-resistant finish for steel and iron parts. It enhances wear resistance while maintaining dimensional accuracy, offering a clean black appearance with minimal thickness buildup.

Service Overview

CMS provides professional Black Oxide Coating Services for a wide variety of precision parts. Our chemical treatment facilities ensure consistent, high-quality black finishes that meet industrial standards.

Our black oxide coating helps to:

  • Prevent rust and oxidation on metal components

  • Achieve a smooth, non-reflective surface appearance

  • Maintain part dimensions without altering tolerances

  • Improve lubricity and reduce friction between moving parts

What is Black Oxide Coating?

Black oxide coating (also known as blackening or blackening treatment) is a chemical conversion coating that forms a thin, uniform black iron oxide layer on the surface of ferrous metals. The process does not add significant thickness to the part, making it ideal for precision machined components.

This process provides:

  • Mild corrosion resistance (enhanced with oil or wax sealing)

  • Reduced light reflection and glare

  • Enhanced aesthetic appearance with a uniform black finish

  • Maintained dimensional accuracy with minimal surface change

Black oxide is commonly applied to steel, stainless steel, and copper alloys, offering both functional protection and decorative appeal.

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CMS Black Oxide Coating Advantages

High Precision Treatment

The conversion coating adds virtually no thickness, preserving tight machining tolerances.

Uniform and Consistent Finish

Provides even color coverage on complex geometries and fine details.

Enhanced Corrosion Resistance

When sealed with oil or wax, black oxide provides lasting protection.

Cost-Effective Finishing Option

Economical compared to plating or painting while maintaining excellent appearance.

Technical Specifications & Process Details

Parameter Description
Coating Type Chemical Conversion Coating (Fe₃O₄ Layer)
Materials Steel, Stainless Steel, Copper Alloys
Coating Thickness 0.5–1.0 µm
Temperature 130–150°C (Hot Black Oxide)
Surface Finish Matte to Semi-Gloss Black
Sealing Options Oil, Wax, or Polymer Seal
Dimensional Change Negligible (<0.5 µm)
Batch Capability Suitable for small-batch prototypes and mass production

Applications

CMS black oxide coating services are widely applied in:

  • Automotive: Gears, shafts, and fasteners requiring wear resistance and aesthetics

  • Aerospace: Precision components with anti-glare and anti-corrosion requirements

  • Industrial Equipment: Tools, fixtures, and machine parts for rust prevention

  • Electronics: Housings and metal parts needing conductive yet corrosion-resistant finishes

  • Defense & Optics: Non-reflective coatings for optical and mechanical assemblies

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CMS ISO9001 certificate

Quality Assurance

CMS ensures strict process and quality control throughout each step:

  • Surface cleaning and pre-treatment before oxidation

  • Chemical bath composition monitoring for consistency

  • Thickness and color uniformity inspection

  • Final oil or wax sealing for long-term corrosion resistance

All finished parts comply with relevant standards such as MIL-DTL-13924, ISO 11408, and ASTM D769.

Frequently  Questions

If you have any questions in the process of product design and manufacturing, you can contact us to obtain expert support and provide the best solution for your product. Get support now ！

Black oxide is a chemical conversion coating that forms a thin black layer on the surface of metals, providing mild corrosion resistance and a low-glare appearance.

Black oxide is mainly used for carbon steel and stainless steel. It is not suitable for aluminum or brass.

Yes, but moderately. It is typically paired with oil or wax sealing to enhance corrosion protection and reduce friction.

No significant dimensional change occurs because the coating is extremely thin (usually 0.2–1 μm). It is safe for tight-tolerance components.

It produces a matte to semi-matte black finish, reduces reflections, and gives parts a uniform industrial look.

Yes. The coating does not flake or chip, making it ideal for gears, shafts, fasteners, and mechanisms.

Yes. When sealed with oil, black oxide improves lubricity and reduces friction between metal surfaces.

It depends. The finish is uniform but typically industrial-looking. For decorative applications, anodizing or electroplating may be better choices.

Black oxide provides wear resistance and mild corrosion protection but is not as strong as anodizing, plating, or powder coating. It’s best for mechanical and internal components.

Usually 2–3 days, depending on part size and quantity. Machining + coating jobs may require additional time.

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Get an Instant Black Oxide Coating Quote Today

Enhance your metal components with our durable and aesthetic black oxide coating service.
Contact CMS today for a professional surface finishing solution.