What is surface treatment:
Coating 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 coating castings, including:

Painting: this is a common method of giving castings a colour and protection against corrosion and damage.

Electroplating: this is a process where castings are covered with a thin shell of metal, typically zinc or copper, to protect against corrosion.

Anodising: this is an electrochemical process in which cast aluminium parts are given a thick, protective oxidised surface that improves resistance to corrosion and impact.

Anodising: This is a form of anodising specifically applied to aluminium. It results in a coloured oxidised surface that can be used to give castings an attractive appearance.

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

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