What type of cure involves immersing a workpiece into a fluidized bed?

The correct answer is fluidized bed cure. This type of curing process involves the application of a coating by immersing a workpiece in a bed of finely powdered material that is suspended in a fluid form, typically air. The fluidized bed allows the powder to flow like a liquid, enabling an even distribution of the coating on the surface of the workpiece.

In this method, the workpiece is preheated before immersion. The heat causes the powder particles to adhere to the surface, melting the coating material and forming a robust layer as it cools. This technique is widely used for creating a durable coating that can provide excellent resistance to corrosion and wear.

Other methods such as chemical cures, flame spraying, and heating cures do not involve this specific immersion method in a fluidized bed, and each serves different purposes and applications in the coating process. Flame spraying, for instance, is a thermal spray technique where molten particles are propelled toward a surface, while heating cures typically involve the application of heat to cure a coating already applied to a substrate.