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Shan Shan Hall Luoyang ancient glass corrosion and protection of components

Author: HuiRen
Tutor: WangLiQin
School: Northwestern University
Course: Archaeology and Museology
Keywords: Shanshaan Assembly Hall glazed pottery components degradation glaze surface deterioration degradation mechanism conservation research
CLC: G264
Type: Master's thesis
Year: 2006
Downloads: 209
Quote: 2
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Abstract


Glazed pottery components, indispensable building materials in China ancient buildings, have definitely functional and artistic properties. Deteriorations such as glazed layer spallation, craze cracking, desquamation and padding chalking occurred since they were exposed in the open air for long time. There are relatively much researches on the manufactures and techniques of modern and ancient mimic of glazed pottery components in domestic field, while the research on degradation mechanisms and conservation methods of these components hasn’t been reported. In this paper we take the glazed pottery components from the ancient building roofs of ShanShaan Assembly Hall, Luoyang, as the main research objects; classify the component degradation categories; carry on scientific analysis of the deterioration products on the green glazed pottery components; deduce the degradation mechanism. With the method of physical mixed, we also have selected the anti-degradation coating materials which are appropriate to be used on these glaze in open air environment, filling the blank of the relative research on conservation methods.By the systemic survey of the glazed pottery components on the roofs of the drama building and Shan gate, the degradation of those glaze pottery components can be classified into 7 types: missing, damage and incomplete, surface aggradation, black shell, glaze surface deterioration, glaze layer breaking off and padding chalking. Among these 7 kinds of degradation, the glaze surface deterioration is usually easy to be ignored. The developing of the glaze surface deterioration will certainly cause glaze layer breaking off, padding chalking and other degradation, thus these beautiful components will lose their original functions of waterproof and anti-efflorescing. From PM, EPMA, XRF and other modern scientific techniques, PbSO4 and PbSO4·2PbO have been analyzed as the main deterioration components of those two degradation products. Considering the local atmosphere environment of Luoyang ,we deduce three main processes of glaze surface deterioration. They are the forming of weak acid water membrane on the glaze surface, the immigrating of lead ions from

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