Examples of experimental protocols and competitive analyses for coating selection for transmission and distribution (T&D) structures are provided in this paper. The tests were conducted in different electrolytes, with painted galvanized and non-galvanized steel including solutions with high chloride, soil, solutions with different salt concentrations and aqueous solutions using deionized water, sea water and corrosive water, etc. The results provide an indication of coating quality and corrosion resistance. Coating evaluation using various combinations of electrochemical impedance spectroscopy (EIS) and other tier testing techniques including cathodic disbondment and cathodic protection shielding is also considered. Finally, methods of EIS-based technologies for rapid evaluation of organic coatings are reviewed and case histories in T&D utility industry is presented.

Subject
Acids, Coating repair, Test methods, Electrochemical impedance spectroscopy, Coating performance, Coatings, Manufacturing, Impedance, Galvanized coatings, Salt spray corrosion testing, Corrosion protection, Corrosion resistance, Coating systems
Keywords:
coating selection, coating evaluation, transmission and distribution structures, electrochemical impedance spectroscopy, case studies
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2019
Association for Materials Protection and Performance (AMPP)
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