The effects of citric acid and phosphocitric acid on the crystallization of sodium sulphate in a selected porous stone have been studied. Both compounds proved to be effective crystallization inhibitors since they promoted efflorescence growth as opposed to subefflorescence growth. The effectiveness of these inhibitors was demonstrated by measurements of the saline solution capillary flow through the porous stone. Scanning electron microscopy analyses showed changes in sodium sulphate crystal morphology and size inside the pores in the presence of inhibitors. Citric acid proved to be slightly more effective than phosphocitric acid. These results are interesting in view of the practical applications to prevent and/or reduce salt crystallization damage to porous ornamental stones.
Acidi organici quali inibitori della cristallizzazione di sali nei materiali lapidei.2
MARROCCHI, Assunta;TATICCHI, Aldo;MINUTI, Lucio;BROGGI, Alessandra;
2006
Abstract
The effects of citric acid and phosphocitric acid on the crystallization of sodium sulphate in a selected porous stone have been studied. Both compounds proved to be effective crystallization inhibitors since they promoted efflorescence growth as opposed to subefflorescence growth. The effectiveness of these inhibitors was demonstrated by measurements of the saline solution capillary flow through the porous stone. Scanning electron microscopy analyses showed changes in sodium sulphate crystal morphology and size inside the pores in the presence of inhibitors. Citric acid proved to be slightly more effective than phosphocitric acid. These results are interesting in view of the practical applications to prevent and/or reduce salt crystallization damage to porous ornamental stones.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
