Powder coating is a dry finishing process where polymer particles are positively charged and applied with a spray pistol to a negatively charged metal part. Afterwards, the coating is cured in an oven where it melts and creates a hard, dense surface. While the primary function of powder coating is aesthetic, it can also withstand harsh conditions when applied properly or additionally pre-treated (as in zinc phosphating). Powder paint delivers a good mix of aesthetics and corrosion resistance but can be a more costly alternative for small quantities.

In this process, wet paint is sprayed onto a cleaned part with a nozzle gun. It creates fine film of paint that mainly serves a decorative purpose. This type of painting is very versatile and is also suitable for single-piece production.

Electroplating uses electrical current to create a thin layer of non-corrosive material on top of a base material. Depending on the coating material, its function may be more decorative (gold, silver) or for corrosion resistance (zinc, chrome, coper). This process is suitable for small parts or where it is important to have a thin coating layer for geometrical or other reasons. It is a cost-effective alternative for medium to high corrosion-resistance purposes.

KTL is a mix of electroplating and painting. Parts undergo a pretreatment process and then are submerged in a vat with paint. Electrical current is used to apply the paint to the part. Residual paint is washed away, leaving an even coating. Only the color black may be used, though parts can be powder coated on top. This coating is a high corrosion resistant, also covering inner cavities. It is mainly used in the automotive industry due to its price/quality ratio.

In hot dip galvanization, parts are submerged in a vat of molted zinc. This creates a robust layer of zinc as an integral part of the steel. This coating method’s function is primarily anticorrosive. It does not offer a nice appearance unless painted over. It is, however, the optimal coating type when high corrosion resistance is required.