Conversion coatings

Conversion coatings are thinly applied chemical coatings that are applied to metal surfaces to fulfill specific purposes. These layers are used to change the properties of the metal surface and prepare it for certain applications. There are different types of conversion coatings that fulfill different functions depending on the specific requirements and the material.

One of the most common applications of conversion coatings is corrosion protection. By forming a protective layer on the metal surface, the susceptibility to environmental influences such as moisture, salts and other corrosive substances is reduced. Another important area of application is to improve the adhesion of subsequent coatings. Conversion coatings serve as adhesion promoters and ensure a reliable bond between the metal substrate and coatings such as paints or adhesives applied to it.

In the automotive industry, conversion coatings are used to optimize the paintability of car body parts. These layers promote even paint distribution and improve the adhesion of the paint film to the metal surface. In addition to corrosion resistance, adhesion promotion and paintability, conversion coatings can also be used to increase or improve electrical conductivity. This is particularly relevant in applications where electrical contacts or conductive surfaces are required.

The process of conversion coating formation takes place through targeted chemical reactions between the metal surface and a special solution or bath containing the required chemicals. These precisely controlled processes aim to achieve the desired properties of the conversion coating and optimize the durability and performance of the treated metal surface.