ON THE CORROSION PROTECTION PROPERTIES OF FLUOROPOLYMER COATINGS

Fluoropolymers have attained great importance as coating materials bec ause of their excellent resistance to high temperature, chemicals and organic solvents. Electrochemical impedance spectroscopy was used to s tudy the corrosion protection properties both on undamaged fluoropolym er coatings and on samples with an artificial defect. The experimental results were interpreted on the basis of a proposed equivalent electr ical circuit which best fits the experimental impedance spectra. In th is way we observed the high quality of the fluorinated coatings compar ed with that of the corresponding hydrogenated polymer used as a refer ence. The protective properties of the fluoropolymer coatings studied can be related to chemical (fluorine and chlorine functional groups) a nd physical (good order of the polymeric chains) characteristics of th e resins.