TESTING OF CORROSION-RESISTANT 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 (EIS) was use d to study the electrochemical behaviour properties both of undamaged fluoropolymer coatings and of samples with an artificial defect. The a rea of the defects in the coatings was determined using the method of break-point. For samples with an artificial defect, a good agreement w as found between the defect area determined using the break-point meth od and the defect area measured by light microscope observation. The u se of the break-point method to calculate the area of defects is discu ssed in comparison with other methods for measuring the defect area in polymeric coating. The use of the break-point method on undamaged coa tings as well showed a smaller presence of defect in the fluorinated c oatings in comparison to the corresponding hydrogenated coatings.