关键词: 出水瓷器, 沉积物, 瓷器损伤, 清洗实验

Abstract: In order to determine the mineral compositions of the concretions on the surface of the underwater porcelains from Huaguang reef I wreck ship，greenishish-white porcelain was taken as an example and energy-dispersive X-ray fluorescence analysis （XRF）and X-ray diffraction （XRD） were used to determine the structural and chemical compositions of different color concretions. The sample contained aragonite （CaCO3），calcite and magnesia [(Ca，Mg)CO3]. The disease of concretions on the surface of the underwater porcelains was summarized. The removal experiment of concretion was performed using chemical reagents，and the reaction time and reaction concentration were analyzed. On the basis of little harm to the porcelain，3 percent of malic acid （MA） and 5 percent of diethylene triamine pentacetic acid （DTPA） and ethylene diamine tetraacetic acid disodium salt （EDTA-2Na） were chosen to remove the concretion on the greenish-white porcelain as chemical reagents. This work should be helpful to the conservation of underwater porcelain.

Key words: underwater porcelain, concretion, damages, cleaning experiment