New insights on protective treatments for marble by FIB-SEM

Florence Heri-Tech - The Future of Heritage Science and Technologies

Sassoni, Enrico^1 ; Graziani, Gabriela^1 ; Franzoni, Elisa^1 ; Scherer, George W.^2

Dept. Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Italy^1

Dept. Civil and Environmental Engineering (CEE), Princeton University, United States^2

关键词: Ammonium phosphates;    Improvement strategies;    Octacalcium phosphate coating;    Oxalate treatments;    Phosphate treatment;    Protective efficacy;    Protective treatment;    Vertical channels;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/364/1/012092/pdf
DOI  :  10.1088/1757-899X/364/1/012092

来源: IOP

【 摘 要 】

In this study, we investigated by FIB-SEM the microstructure of protective coatings formed by two inorganic treatments (namely, ammonium oxalate and ammonium phosphate solutions), with the aim of identifying the factors limiting the protective efficacy of the coatings and outlining possible improvement strategies. In the case of the oxalate treatment, the resulting layer of whewellite was found to contain vertical channels, which can allow water to reach the marble surface and trigger dissolution. Possible prevention of the formation of these channels by addition of a calcium source to the oxalate solution was attempted, but even micromolar additions led to rapid precipitation in the solution. In the case of the phosphate treatment, the resulting hydroxyapatite and octacalcium phosphate coating was found to be cracked and porous. To prevent cracks and pores, diminishing the ammonium phosphate concentration and adding ethanol to the solution were found to be effective strategies, as cracks were prevented and pores were reduced almost to zero. The resulting protective efficacy of the coating was found to be significantly improved, although still not perfect.