Black Oxide

What is Black Oxide?
Black oxide is a chemical conversion coating applied to ferrous metals by immersing parts in a heated alkaline solution, typically maintained at around 285°F. The reaction creates a magnetite layer (Fe₃O₄) that becomes part of the surface, delivering a dark black finish without altering part dimensions. While there are cold black oxide methods, only the hot process provides consistent, high-quality results that meet industrial, military, and automotive standards. Cold processes often cause color variation, reduced durability, and flaking—making them unsuitable for critical applications. Advanced Metal Finishing uses the proven hot black oxide method to ensure consistent, reliable outcomes.

Benefits of Black Oxide

• No dimensional change during application
• Reduces light glare and surface reflectivity
• Will not chip, peel, or flake
• Provides mild corrosion resistance with added after-finish
• Enhances lubricity and anti-galling for moving parts
• Suitable for high-temperature environments (up to 900°F)
• No hydrogen embrittlement risk
• Weldable without harmful fumes
• No white corrosion like some plated parts

Where It’s Used
Black oxide is widely used for tools, fasteners, automotive parts, firearms, hardware, and machine components. It’s ideal for parts that require a uniform black finish, low glare, or improved surface performance. This finish is especially suitable for interior or low-exposure environments and offers an excellent balance of function and appearance when paired with the right after-finish.

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