The aim of this work was to assess the effect of polyaniline salts (PANI-HA) with various dopant types
on the mechanical and corrosion properties of organic protective coatings dependent on the pigment
volume concentration. The doping acids used included phosphoric acid (H3PO4), sulphuric acid (H2SO4),
hydrochloric acid (HCl), p-toluenesulphonic acid (PTSA), and 5-sulphosalicylic acid (CAS). The polyaniline
salt types were described by their physico-chemical parameters. An epoxy ester resin was used as the
binder for the organic coatings. The organic protective coatings included the various PANI-HA types. The
prepared organic coatings were subjected to mechanical testing, corrosion tests and linear polarisation
technique. Organic coatings achieved during mechanicaltests comparable results regardless ofthe type of
PANI dopant or PVC (pigment volume concentration) with the exception of organic coatings fulfilling the
condition PVC = CPVC (critical pigment volume concentration) which exhibited decrease of mechanical
resistance. The results of accelerated corrosion tests and techniques of linear polarisation testify that in
particular the PVC parameter affects the resulting corrosion resistance. During those tests, the organic
coatings exhibited improved corrosion resistance, particularly at low pigment volume concentrations
(PVC = 0.1–5%) irrespective of the pigment used
Cyclic corrosion tests and/or electrochemical test methods are
largely used to assess the corrosion resistance of organic coatings
[6,22]. Among the electrochemical methods, the linear polarisation
(LP) technique is typically used for corrosion monitoring