TESTING OF CORROSION-RESISTANT FLUOROPOLYMER COATINGS

Fluoropolymers have attained great importance as coating materials because of their excellent resistance to high temperature, chemicals and organic solvents. Electrochemical Impedance Spectroscopy (EIS) was used to study the electrochemical behaviour properties both of undamaged fluoropolymer coatings and of samples with an artificial defect. The area of the defects in the coatings was determined using the method of break-point. For samples with an artificial defect, a good agreement was found between the defect area determined using the break-point method and the defect area measured by light microscope observation. The use of the break-point method to calculate the area of defects is discussed in comparison with other methods for measuring the defect area in polymeric coating. The use of the break-point method on undamaged coatings as well showed a smaller presence of defect in the fluorinated coatings in comparison to the corresponding hydrogenated coatings.