Electrochemical Desalination of Historic Portuguese Tiles, Azulejos, in laboratory scale

L. M. Ottosen, C. Ferreira & I. V. Christensen
Soluble salts causes decay of historic Portuguese tiles. Treatment options for removal of thesalts are few. The present paper deals with development of a method for electrokineticdesalination, where an electric DC field is applied. Experiments are conducted with XVIIIcentury tiles with and without mortar from the tile bed. The focus is on removal of salts overinterphases between glaze/biscuit and biscuit/mortar. As received, the tiles had NaCl crystalsunder loosened glaze, whereas after treatment no salt crystals...