What is aluminum oxide commonly used for in surface preparations?

Aluminum oxide is widely used as an abrasive cleaning material in surface preparation due to its hardness and durability. In applications where surfaces need to be cleaned or prepared for subsequent coatings, aluminum oxide is effective for removing contaminants, old paint, rust, and other surface imperfections. When used in processes such as sandblasting or grinding, it helps achieve a clean and properly textured surface, ensuring better adhesion for paint and coatings. This makes it a preferred choice in various industrial applications, particularly in the maritime and aerospace sectors, where surface integrity is crucial for performance and longevity.

The other options do not accurately represent the primary use of aluminum oxide. While anti-corrosive coatings, surface primers, and sealants are essential in their respective applications, they serve different purposes compared to the abrasive properties of aluminum oxide in surface preparation.