目的 研究臭氧与LED灯光共同作用于银质文物模拟材料的腐蚀行为和规律.方法 采用石英晶体微天平(QCM)反应性监测及SEM-EDS等方法,研究了暴露于臭氧和LED灯下的银质文物模拟材料的腐蚀行为及其表面特征.结果 暴露于LED灯或臭氧条件下的石英晶振片频率均有所下降,而暴露于LED灯加臭氧复合条件下的石英晶振片频率下降速率更快且最终下降值更多.此外,升高LED灯色温、增大臭氧浓度或提高环境温度,均会使石英晶振片频率下降速率更快且最终下降值更大.在臭氧质量浓度为5 μg/L环境中,与无光照条件相比,LED光照下的银片表面的腐蚀产物及氧元素含量较多,并且LED灯的色温越高,其光照下的银片表面生成的腐蚀产物越多,但不同品牌的LED灯下的银片表面腐蚀产物生成量及氧元素含量均相近.结论 臭氧与LED灯光均会加速银的腐蚀,两者共同作用时,会使银腐蚀更严重.升高LED灯色温、增加臭氧浓度或提升环境温度也同样会加速银的腐蚀,但不同品牌LED灯对银腐蚀的影响却相差无几.
The work aims to study the corrosion behavior and mechanism of silver relics simulation materials which were exposed to ozone and LED lighting.Quartz crystal microbalance (QCM) and SEM-EDS were used to study the corrosion behavior and surface characteristics of silver relics simulation materials which were exposed to ozone and LED lighting.Frequency of silver-electrodeposited quartz crystal exposed to LED lighting or ozone decreased slightly,while that of silver-electrodeposited quartz crystal exposed to the compound condition of LED lighting and ozone decreased faster and more.Besides,the frequency of silver-electrodeposited quartz crystal decreased faster and more as color temperature of LED,ozone concentration or ambient temperature increased.Compared with light-free condition,more corrosion products and higher oxygen content were generated on the surface of silver exposed to LED lighting in an ozone environment with mass concentration of 5 μtg/L.The higher the color temperature of LED lighting was,the more corrosion products were generated on the surface of silver.However,the production of corrosion products and the content of oxygen element on the surface of silver exposed to different brands of LED were similar.Ozone and LED lights will accelerate the corrosion of silver especially when the two coexist.The corrosion rate of silver increases with the increase of the LED color temperature,ozone concentration or ambient temperature while LED brands have similar influence on the silver corrosion.
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