Life assessment of organic coating based on accelerated degradation test and modeling

The protective properties of organic coatings for internal applications of plane cabin are generally evaluated by means of accelerated degradation laboratory tests, including electrochemical techniques. The coatings are stressed by different mechanical, chemical, thermal loads and the effects on the protective properties can be measured by using well established electrochemical techniques, like electrochemical impedance spectroscopy, Insulation resistance, etc. An absence of concerned question is how to estimate the life of organic coatings of panel and therefore determine the repair period. The coatings were tested in the laboratory using electrochemical impedance spectroscopy, in order to quantify the damage, after accelerated degradation test. The test data are then used to fit degradation paths by linear regression models. Extrapolation to the failure threshold allows the prediction of the Time-to-Failure of coating. Finally, the reliable lifetime of the coating is predicted by an accelerated degradation model.