Black Oxide Coating Finishing Services
One-stop multi-axis CNC black oxide treatment with matte low-glare magnetite layer, MIL-DTL-13924 compliant for tight-tolerance aerospace and automotive steel components.
ISO 14001:2015 ISO 9001:2015 IATF 16949:2016
Black Oxide Coating Overview
CustomParts-MFG offers professional black oxide chemical conversion finishing for all ferrous metals with ISO9001, IATF16949, ISO14001 certification, complying with MIL-DTL-13924, AMS2485 and ASTM D769 industry standards. Our hot and mid-temperature black oxide process chemically converts steel surface into dense magnetite (Fe₃O₄) thin film without extra coating buildup, paired with optional oil/wax post-sealing for upgraded anti-rust performance. In-house full manufacturing from CNC machining to final packaging serves automotive, defense, medical and general machinery for precision parts requiring non-glare matte black appearance and intact dimensional tolerance.
The black oxide coating on their precision parts provides exceptional corrosion resistance and a durable, low-glare finish that perfectly meets our equipment’s functional and aesthetic requirements. Its consistent quality and reliable performance have made these components a trusted standard in our assemblies.
Core Advantages of Black Oxide Coating
- Zero Dimensional Shift: Ultra-thin conversion film preserves original thread, bore and mating surface tolerance, perfectly suited for tight-fit precision assemblies.
- No Hydrogen Embrittlement Risk: Chemical conversion instead of electro-deposition, safe for high-strength alloy steel critical components.
- Matte Non-Reflective Finish: Uniform deep black surface eliminates light glare for optical and military low-visibility applications.
- Improved Lubrication & Anti-Galling: Sealant oil retention reduces friction between moving gears and shafts to minimize wear.
- Cost-Effective & Excellent Primer Base: Lower cost than black plating/powder coating; ideal underlayer for subsequent painting and powder coating.
Two Main Black Oxide Process Types
High-Temp Hot Black Oxide (285~310°F)
Classic caustic bath process delivering deep consistent black color, outstanding bonding, most widely used standard specification for industrial ferrous parts.
Mid-Temperature Eco-Friendly Black Oxide (200~250°F)
Low-fume, energy-saving alternative with equivalent cosmetic performance, preferred for environmental-friendly mass production projects. Check Out the ToolkitBlack Oxide Coating Applicable Base Materials
Available substrates: Carbon steel, alloy steel, cast iron, powder metallurgy; customized dedicated formula for stainless steel black finish. Not compatible with aluminum, copper and brass non-ferrous alloys.
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Black Oxide Coating Standard In-house Production Flow
Pre-Processing & Precision Surface Prep
CNC machining, deburring, ultrasonic degreasing and rust stripping to expose bare clean metal surface.
Controlled Alkaline Black Oxide Conversion
Immerse in temperature-regulated alkaline solution to form uniform Fe₃O₄ black conversion layer.
Water Rinsing Multi-Stage Cleaning
Multi-step rinsing to remove residual chemical solution from component surface.
Optional Post-Sealing Treatment
Custom oil, wax or dry film impregnation to greatly boost salt spray corrosion resistance up to 96+ hours salt spray.
Final Quality Inspection & Anti-Rust Packaging
Appearance uniformity, adhesion and salt spray testing inside professional metrology lab. Check Out the ToolkitBlack Oxide Coating Industry Application Fields
- Automotive & Aerospace: Precision fasteners, transmission gears, engine fittings and structural brackets.
- Defense & Firearm Components: Internal and external gun parts demanding low-glare and wear-resistant finish.
- Industrial Machinery & Hydraulics: Tooling fixtures, shafts, valve assemblies and mold accessories.
- Medical Equipment: Surgical hardware and precision instrument components for clean anti-corrosion finishing.
- Hardware & Consumer Goods: High-end architectural fittings and recreational mechanical parts.
One-stop Black Oxide Coating Full-service Superiority
- All production procedures completed in-house: CNC processing→heat treatment→surface prep→black oxide→sealing→packaging, single PO & unified invoice without multi-supplier management cost.
- Flexible lead time: Prototype order 35 working days; bulk production within 24 weeks, zero MOQ limitation.
- Custom cleanroom anti-rust packaging available for high-end precision medical and aerospace finished parts.
Request Free Custom Black Oxide Quotation
Upload CAD drawings, material grade and sealing requirements via quote page, our surface engineering team provides free DFM suggestion and detailed quotation within 24 working hours.
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FAQs About Black Oxide
What exactly is black oxide?
expand_less expand_moreA: Ferrous metal chemical conversion coating forming magnetite Fe₃O₄ film, not electroplating; no dimensional gain with matte black anti-glare property.
Can black oxide apply on aluminum or copper?
expand_less expand_moreA: Only for iron-based ferrous metals (steel, cast iron, stainless steel); unavailable for aluminum, brass and copper alloys.
What’s the difference between hot and mid-temp black oxide?
expand_less expand_moreA: High temp delivers classic deep black; mid-temp is eco low-fume & energy-saving option, engineers select process per material and usage.
Does black oxide alone prevent rust?
expand_less expand_moreA: Bare black oxide has limited anti-corrosion; oil/wax post-sealing is required to reach long-term salt spray protection.
Can black oxide coat over existing paint/plating?
expand_less expand_moreA: Former coating and rust must be fully stripped to bare metal before black oxide chemical treatment.
Does Black Oxide provide corrosion protection?
expand_less expand_moreA: Yes, but with an important note. The black oxide coating alone offers only minimal corrosion resistance. The real protection comes from the post-treatment sealant (typically oil or wax). Properly sealed parts achieve significant rust resistance, often passing standardized salt spray tests (e.g., 24-100+ hours depending on the sealant).
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