PAni as prospective replacement of chromium conversion coating in the protection of steels and aluminum alloys

摘要

Corrosion inhibition properties of chemical and electrochemically synthesized polyaniline (PAni), poly-o-methoxianiline (POMA) and their copolymers, in form of coatings of stainless steel AISI 304 and aluminum alloy 6061-T6 are studied in 3% and 0.1 M NaCl solutions, respectively. Polarization curves showed that the protection of steels by PAni is of anodic nature by setting the redox potential in the passive potential of the substrate. However, the protection of aluminum alloys after separation of both the corrosion and pitting potential is also anodic.