The development of anti-corrosive pigments for the most diverse coating systems is extremely time consuming and expensive, owing to the necessary climatic testing, such as testing under salt spray exposure. To accelerate work on a new zinc-free pigment with improved protection, modern, electrochemical investigation methods have been used successfully and verified using traditional tests.1
The use of suitable anti-corrosive pigments has a significant influence on the protective properties of formulations for metal substrates (Figure 1). The mode of action of an anti-corrosive pigment is attributed to the following factors:2,3