The metallic oxide used in the form of powder in a paint is called

Explanation:

The Metallic Oxide Used in the Form of Powder in Paints (Base)

Definition: The metallic oxide used in the form of powder in paint is called the Base. In the context of paint formulation, the base is one of the essential components that provide the paint with its desired properties. It is generally a metallic oxide or compound that serves as the main pigment and provides opacity, durability, and protection to the surface being painted.

Role of the Base in Paint:

• Opacity and Hiding Power: The base is responsible for the paint’s ability to hide the surface underneath. It scatters light and provides a uniform appearance to the painted surface.
• Durability: The base imparts durability to the paint, making it resistant to environmental factors such as moisture, sunlight, and corrosion.
• Protection: The base helps protect the underlying surface from damage caused by environmental exposure, including oxidation, rust, and wear.
• Adhesion: It improves the adhesion of the paint to the surface, ensuring that the paint stays on the substrate for a longer period.
• Color and Aesthetic Appeal: While the primary role of the base is not to provide color, metallic oxides like titanium dioxide, zinc oxide, or iron oxide are often used as bases because of their ability to enhance the color and brightness of the paint.

Examples of Bases:

• Titanium Dioxide (TiO₂): A widely used base due to its high opacity and brightness, making it ideal for white and light-colored paints.
• Zinc Oxide (ZnO): Known for its anti-microbial and anti-corrosive properties, it is commonly used in protective coatings.
• Iron Oxide (Fe₂O₃): Used in paints for its durability and strong color, especially in red and brown shades.
• Lead Oxide (Pb₃O₄): Historically used for its durability and anti-corrosive properties, although its use has declined due to toxicity concerns.

Process of Application:

The base is mixed with other components of the paint, including the vehicle, driers, and extenders. The mixture is then applied to the surface in layers to achieve the desired finish. The base ensures the paint provides a smooth, opaque, and durable coating that adheres well to the substrate.