Three types of sheet metal finishing

Sheet metal finishing is a stage during manufacturing that improves the durability and performance of metal components.

After sheet metal fabrication processes, such as those from https://dkmsheetmetal.co.uk/, including cutting, forming, and welding, the surface of the metal often requires treatment to protect it from corrosion and damage over time.

1. Powder Coating for Sheet Metal

Powder coating is a dry finishing process where a fine powder made of resin and pigment is applied to a metal surface and then cured under heat to form a hard coating. Once applied, the coated part is placed in an oven and heated to temperatures of around 160C to 200C. During this curing stage, the powder melts and chemically bonds to form a smooth, continuous layer.

2. Wet Spray Finishing for Sheet Metal

Wet spray finishing, often referred to as liquid painting, is when a liquid coating is applied to the surface of the metal using a spray gun – typically consisting of pigments, binders, and solvents, which evaporate as the coating dries, leaving behind a solid protective layer.

One of its big advantages is flexibility, as it can be used on a variety of materials and for both small and large production runs. However, it produces more emissions due to the solvents.

3. Stove Enamel Coating

Stove enamel coating is a finishing process in which a specially formulated enamel paint is applied to the metal and then baked in an oven to harden the coating – resulting in a smooth, hard-wearing surface. Stove enamel coating is commonly used for finishing radiators, kitchen appliances and light fixtures.