To color sheet metal prototypes, there are usually four ways. They are painting, powder coating, electroplating, and oxidizing. How do these processes work? What are the best materials for different processes?

1. Painting

Painting generally refers to spraying liquid paints. There are two ways of drying the paints: naturally drying down under room temperature, or through baking. The former method is more cost-effective but has poor effects compared to the latter. By baking, the thickness of the paint film is thinner thus suitable for some precision products. 

Materials suitable: cold-rolled sheet, hot-rolled sheet, etc.

2. Powder coating

Powder coating refers to the polarization of powder that is uniformly attached to the surface of the part of opposite polarity under the action of the electric field force. After powder coating, the parts can be wear-resistant and corrosion-resistant with the thick film.

It is suitable for products with a lower precision requirement such as cabinets and equipment. The cost is lower and the plastic powder can also be recycled.

Materials suitable: cold-rolled sheet, hot-rolled sheet, etc.

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3. Electroplating

By attaching another metal to the surface of the material, increased corrosion resistance is achieved as well as a certain aesthetic enhancement. Among the most widely used electroplating processes are colorful zinc plating, blue and white zinc plating, black zinc plating, and chrome plating.

Materials suitable: cold-rolled sheet, hot-rolled sheet, etc.

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4. Oxidizing

By oxidizing the metal on the surface of the part, a dense protective film forms on its surface to increase corrosion resistance. There are generally two types of oxidation: chemical oxidation and anodizing. It is a common surface treatment and is usually available in original color anodizing and black oxidizing. 

Materials suitable: aluminum, etc.

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In cases where you have no idea which surface treatment can realize the color and finishing you want, just consult your prototyping suppliers. They can offer the best solution.