Black Oxide Coating

Table of Contents

Black Oxide Coating

What is an oxide coating? Oxide coatings are a type of coating that is primarily used to protect metal from corrosion. The most common type of oxide coating is black oxide.

Black oxide is an electrochemical conversion coating that forms a protective layer on the surface of metals, such as steel and aluminum, by reacting with oxygen in the air. It contains several different elements such as iron, chromium, and manganese.

The primary function of black oxide coatings is to provide protection against corrosion in the form of a thin film. This film will be more effective if it covers all surfaces in contact with moisture or oxygen.

What is an oxide coating and black oxide coating?

What does black oxide coating do?

Black oxide coating has three main functions: corrosion resistance, lubricity, and blacknessThe first function of black oxide coating is corrosion resistance. This is because the coating forms a thin protective layer on the surface of the material that prevents oxygen from reacting with it. The second function is lubricity, which means that black oxide coatings can reduce friction between two surfaces by forming a thin film between them. The third function is blackness which means that it has a dark color and provides protection against ultraviolet radiation.

Is black oxide coating durable?

Black oxide coatings are typically applied to ferrous metals such as steel, iron, and stainless steel. The coatings are usually composed of manganese dioxide, which reacts with the metal to form a black layer on the surface.

The durability of the black oxide coating depends on many factors such as the thickness of the coatings and how well it was applied. The thickness plays an important role in determining how long it will last because it provides more protection against wear and tear.

—So is black oxide coating durable? Does black oxide protect against rust?


Yes, Black oxide coatings are very durable and can last for years without any significant signs of wear or deterioration. The black oxide process is a coating that is applied to steel, usually with a thickness of 0.001 inches. 

It does protect against rust. Black oxide provides protection against corrosion and rust by sealing the surface of steel with a layer of carbon that prevents oxygen from reaching the metal underneath.

The resistant to corrosion and abrasion features of black oxide coating, making it an excellent choice for applications such as marine equipment, bridges, and other high-wear surfaces.

How do you apply black oxide coating?

Author: Mose Li

Author: Mose Li

Director of Project Engineering at 3Q Machining

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