银质文物材料在模拟博物馆光照环境中的腐蚀行为研究

发布时间：2018-03-24 23:32

本文选题：银质文物　切入点：腐蚀　出处：《华东理工大学》2017年硕士论文

【摘要】：博物馆环境中,文物在储存或展出时照明是不可避免的,同时环境中的臭氧以及展柜中缓慢释放出的有机酸也很难得到防范,而这些因素都会对银质文物材料的腐蚀产生巨大影响。本文主要采用石英晶体微天平(QCM)反应性监测方法对银质文物材料在模拟博物馆光照环境中的腐蚀行为进行了监测。通过监测在光照、臭氧、有机酸以及其复合条件下镀银石英晶振片的频率变化,得到了银的腐蚀动力学曲线。同时结合扫描电子显微镜(SEM)、能谱仪(EDS)、光电子能谱(XPS)以及拉曼光谱(Raman)对暴露于不同环境条件下的银片表面腐蚀形貌和腐蚀产物进行了分析,并初步探讨了银质文物材料的腐蚀机理。研究结果表明,光照和臭氧均会加速银质文物材料的腐蚀,并且两者还具有协同作用。在臭氧气氛中,LED灯色温越高,其加速银腐蚀的作用越明显,而卤素灯对银腐蚀的影响要大于LED灯,其中暴露于飞利浦卤素灯下的银腐蚀的最严重;环境温度升高以及臭氧浓度增加均会加剧银的腐蚀;暴露于光照和臭氧复合环境中21天后,银表面腐蚀产物包括Ag2O和少量Ag2C03。在自然空气背景下,光照和有机酸也会加速银质文物材料的腐蚀,其中甲酸比乙酸加速银腐蚀的作用更明显;有机酸浓度增加也会使银质文物材料的腐蚀速率加快;暴露于存在光照和有机酸的空气环境中21天后,银表面腐蚀产物中包括 Ag2O 和 Ag_2CO_3、Ag_2S、Ag_2SO_4和 Ag_2SO_3。
[Abstract]:In a museum environment, lighting is inevitable when the artifacts are stored or displayed, and the ozone in the environment and the slow release of organic acids from the display cabinets are also difficult to prevent. In this paper, quartz crystal microbalance (QCM) reactivity monitoring method is mainly used to study the corrosion behavior of silver cultural relic materials in simulated museum lighting environment. By monitoring the light, Changes in frequency of silver plated quartz wafers under ozone, organic acids and their compounding conditions, The corrosion kinetics curves of silver were obtained, and the corrosion morphology and corrosion products of silver wafer exposed to different environmental conditions were analyzed by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), photoelectron spectroscopy (XPS) and Raman spectroscopy (Raman). The corrosion mechanism of silver cultural relic materials was preliminarily discussed. The results showed that both illumination and ozone could accelerate the corrosion of silver relic materials, and both of them had synergistic effect. The higher the color temperature of LED lamps in ozone atmosphere, the higher the color temperature of LED lamps. The effect of Halogen lamp on silver corrosion is more obvious, and the effect of halogen lamp on silver corrosion is greater than that of LED lamp, among which the silver corrosion caused by Philips halogen lamp is the most serious, and the increase of ambient temperature and ozone concentration will aggravate the silver corrosion. After 21 days of exposure to a composite environment of light and ozone, corrosion products on the silver surface included Ag2O and a small amount of Ag2C03.Light and organic acids also accelerated the corrosion of silver antiquities in natural air. The effect of formic acid on silver corrosion is more obvious than that of acetic acid. The increase of organic acid concentration also accelerates the corrosion rate of silver relic materials. After 21 days of exposure to air with light and organic acids, Among the corrosion products on the surface of the silver are Ag2O and AgS _ 2CO _ 3 / AgS _ s _ 2S _ 2s _ 4 and Ag2SO _ 3s _ s _ 4.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：K876.43;TG178

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