What is surface treatment:
Surface treatment of castings refers to the process of finishing cast metals or plastics to improve their external appearance, functional properties and resistance to environmental influences. There are a number of techniques for surface treatment of castings, including:

Paint: This is a common method of giving cast items a color and protection against corrosion and damage.

Galvanization: This is a process in which cast items are covered with a thin shell of metal, typically zinc or copper, to protect against corrosion.

Anodizing: This is an electrochemical process where cast aluminum parts are given a thick, protective oxidized surface that improves resistance to corrosion and impact.

Anodizing: This is a form of anodizing specifically applied to aluminum. It results in a colored oxidized surface that can be used to give cast items an attractive appearance.

Powder coating: This is a technique where a powder of paint materials is applied to molded objects and then heat-treated to produce a hard, smooth and colored surface.

The choice of surface treatment depends on the specific requirements for the castings, including corrosion resistance, gloss, color and durability. It is important to consider how the castings will be used and the environmental factors they will be exposed to in order to select the most appropriate surface treatment.