This review presents a selection of patents reported on coatings for high-voltage porcelain insulators. An
insulator is subject to surface corrosion due to air pollution or salt deposition, which may form a conductive electrolytic
solution. This may cause a flashover and shut down the transmission and distribution electrical energy line, particularly in
high polluted or coastal regions. The main goal of protective coatings has been to produce flashover-free high-voltage
insulators. Coating porcelain insulators with specific inorganic or organic may prevent the leakage current. Major
approaches are based either on semiconducting glazes or hydrophobic coatings.
Coatings, films, glazes, hydrophobic, hydrophilic, insulators, photocatalytic, porcelain, semiconducting.
Department of Chemical Engineering (EQA), Federal University of Santa Catarina (UFSC), 88040- 900 Florianópolis, SC, Brazil