Electrochemical impedance study models anticorrosive performance of coatings
In a study, the atmospheric corrosive protection characteristics of four organic coatings were modeled based on the evolution of low-frequency impedance over time when subjected to accelerated tests and outdoor exposures.
Environmental characteristics such as the time of wetness, chloride and sulfate depositions, and ultraviolet radiation were defined as explanatory variables.
Good prediction of |Z|ω→0
The results obtained helped to establish a relationship between low-frequency impedance (|Z|ω→0), acquired from electrochemical impedance spectra, and the explanatory variables. An adjustment factor was calculated for each coating against the most aggressive natural exposure, resulting in a good prediction of |Z|ω→0 and the performance of the coatings for other outdoor tests.
The study is published in: Journal of Coatings Technology and Research, September 2016, Volume 13, Issue 5, pp 895–904
