Term: micaceous iron oxide

Micaceous Iron Oxide (MIO) is a naturally occurring mineral form of iron oxide (Fe₂O₃) characterized by its flaky, plate-like (micaceous) structure. It is commonly used as a pigment and reinforcing additive in protective coatings, especially in industrial and marine environments.

Key Characteristics:

• Color: Typically grey to dark grey or metallic.
• Structure: Lamellar (flake-like), which provides excellent barrier properties.
• Chemical Composition: Primarily ferric oxide (Fe₂O₃), with a high degree of purity.

Uses in Painting and Coatings:

• Corrosion Resistance: MIO is widely used in anti-corrosive coatings due to its ability to form a physical barrier that slows down the penetration of moisture and oxygen.
• Durability: Enhances the mechanical strength and weather resistance of coatings.
• Common Applications: Structural steel, bridges, pipelines, offshore platforms, and other infrastructure exposed to harsh environments.

How It Works:

The flaky particles of MIO align parallel to the substrate when applied in a coating, creating a layered structure that significantly increases the path length for water, oxygen, and corrosive agents to reach the metal surface—this is known as the "tortuous path" effect.

In summary, Micaceous Iron Oxide is a high-performance pigment used in protective coatings to improve corrosion resistance and durability, especially in demanding industrial and marine settings.