ABSTRACT
The corrosion protection of metallic substrates by simple organic layers is often not good enough due to, for example, poor adhesion. The term “conversion coating” is used to describe coatings in which the substrate metal provides ions that become part of the protective coating. The coating layers are composed of chemically inert inorganic compounds. These inert compounds on the surface reduce both anodic and cathodic areas and delay the transit of reactive species to the base metal. This results in increases in the slopes of anodic and cathodic polarization curves, thereby decreasing the rate of corrosion of the substrate.
