Composition analysis of the surface and depth distribution of metal and ceramic cultural relics by laser-induced breakdown spectroscopy
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摘要:采用 诱导击穿光谱结合 共聚焦显微镜,对河南省上蔡郭庄楚国墓葬群出土的青铜器和故宫博物院灵沼轩的陶瓷砖成分进行表面及深度分布分析。研究表明,青铜器表面的腐蚀层元素分布不均匀,可能源于周围的土壤环境和周围器物,或者从内部到外部的离子外移等,但基体组成相对比较简单。通过分析青铜器腐蚀层成分的深度分布可以了解腐蚀层的腐蚀机理,从而为青铜器的保护提供科学方法;陶瓷的透明釉层和釉彩料层元素分布均匀,釉彩料层存在一定的硼元素,而透明釉中则不含硼元素,原因在于硼元素可有效降低釉的熔融温度范围和表面张力。进一步利用共聚焦显微镜测试剥蚀深度,结合得到的光谱估算出了不同釉层的大概厚度。Abstract:Composition analysis of the surface and depth distribution of bronze artifacts excavated from the Chu Tomb in Guozhuang Shangcai, Henan Province and ceramic tiles of Lingzhaoxuan from the Palace Museum are carried out by laser-induced breakdown spectroscopy and laser scanning confocal microscopy. Studies have shown that the elemental distribution of the corroded layer on the surface of bronze is uneven. This corrosion might originate from the surrounding soil environment and surrounding artifacts or ion migration from the artifacts’ insides to their outsides. Luckily, the composition of bronze is relatively simple. The corrosion mechanism of the corroded layer can be understood by analyzing the depth distribution of the composition in bronze, thereby providing a scientific method for its protection. The elemental distribution of ceramic is homogeneous in transparent and colored glaze. Colored glaze includes Boron (B), which could effectively reduce its melting temperature range and surface tension, but there is no boron (B) in transparent glaze. Furthermore, confocal microscope tests of the depth of erosion combined with its spectra can be used to estimate the approximate thickness of different glaze layers.
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表 1bronze 1表面及深度的元素分布结果
Table 1.Surface and depth distribution of different elements of bronze 1
编号 bronze 1 点位1 表面 Cu、Pb、Mg、Al、Ca、Fe、Si、O、Cl、Cd、Ba 深度1 Cu、Pb、Mg、Al、Ca、Fe、Si、O、Cl、Cd、Ba、Sn 深度2 Cu、Pb、Mg、Al、Ca、Cd、Ba、Sn 点位2 表面 Cu、Pb、Mg、Al、Ca、Fe、Si、O、Cl、Cd、Ba、Zn 深度1 Cu、Pb、Mg、Al、Ca、Fe、Si、O、Cl、Cd、Ba、Sn、Zn 深度2 Cu、Pb、Mg、Al、Ca、Cd、Ba、Sn 点位3 表面 Cu、Pb、Mg、Al、Ca、Fe、O、Cl、Cd、Ba、Si、Zn 深度1 Cu、Pb、Mg、Al、Ca、Fe、Si、O、Cl、Cd、Ba、Sn、Zn 深度2 Cu、Pb、Mg、Al、Ca、Cd、Ba、Sn 表 2bronze 2的元素表面及深度分布的结果
Table 2.Surface and depth distribution of different elements of bronze 2
编号 bronze 2 点位1 表面 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、Si、Cl、Ni、Cd、O、Sn、Ni、Eu、Cd、Rh、Nb、Ru、Th、Dy 深度1 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、Si、Cl、Ni、Cd、O、Sn、Ni、Eu、Cd、Rh、Nb、Ru、Th、Dy 深度2 Cu、Pb、Sn、Mg、Na、Al、Ca、Cd、Sn 点位2 表面 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、Si、Cl、Ni、Cd、O、Sn、Ni、Eu、Cd、Rh、Nb、Ru、Th、Dy 深度1 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、Si、Cl、Ni、Cd、O、Sn、Ni、Eu、Cd、Rh、Nb、Ru、Th、Dy 深度2 Cu、Pb、Sn、Mg、Na、Al、Ca、Cd、Sn 点位3 表面 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、Si、Cl、Ni、Cd、O、Sn、Zn、Ni、Eu、Cd、Rh、Nb、Ru、Th、Dy 深度1 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、Si、Cl、Ni、Cd、O、Sn、Ni、Eu、Cd、Rh、Nb、Ru、Th、Dy 深度2 Cu、Pb、Sn、Mg、Na、Al、Ca、Cd、Sn 表 3bronze 3的元素表面及深度分布结果
Table 3.Surface and depth distribution of different elements of bronze 3
编号 bronze 3 点位1 表面 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、 Si、Cl、Ni、
Cd、O、Sn、Ni、Eu、 Cd、Rh、Nb、Ru、Th、Dy深度1 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、 Si、Cl、Ni、
Cd、O、Sn、Ni、Eu、 Cd、Rh、Nb、Ru、Th、Dy深度2 Cu、Pb、Sn、Mg、Na、Al、Ca、Cd、Sn 点位2 表面 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、 Si、Cl、Ni、
Cd、O、Sn、Ni、Eu、 Cd、Rh、Nb、Ru、Th、Dy深度1 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、 Si、Cl、Ni、
Cd、O、Sn、Ni、Eu、 Cd、Rh、Nb、Ru、Th、Dy深度2 Cu、Pb、Sn、Mg、Na、Al、Ca、Cd、Sn 点位3 表面 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、 Si、Cl、Ni、
Cd、O、Sn、Ni、Eu、 Cd、Rh、Nb、Ru、Th、Dy深度1 Cu、Pb、Sn、Mg、Na、Al、Ca、Fe、 Si、Cl、Ni、
Cd、O、Sn、Ni、Eu、 Cd、Rh、Nb、Ru、Th、Dy深度2 Cu、Pb、Sn、Mg、Na、Al、Ca、Cd、Sn 表 4陶瓷砖样品不同点位的平均剥蚀深度
Table 4.The average denudation depths of ceramic tile samples at different points (μm)
编号 宽度 高度 长度 CZ-14白色 1027.888 42.381 1028.907 CZ-01白色 1027.888 82.791 1031.621 CZ-01绿色 1027.888 78.458 1031.862 CZ-02白色 1027.888 53.414 1029.743 CZ-02蓝色 1027.888 64.516 1030.202 表 5CZ-14的元素表面及深度分布结果
Table 5.Elemental surface and depth distribution of CZ-14
编号 CZ-14 分析点位 表面(5个脉冲) (透明釉)Na、Mg、Al、Si、K、Ca、Cr、P、Ti、Fe、O、Pb、Cu、Mn、Co 深度64 µm(75或者76个脉冲) Na、Mg、Al、Si、K、Ca、Ti、Fe、O、Mn、(胎体)Rb、Sr、Y和Zr 表 6CZ-01的元素表面及深度分布结果
Table 6.Surface and depth distribution of different elements of CZ-01
编号 CZ-01 白色部分分析点位 表面(5个脉冲) (透明釉)Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Co、Zn、Cu、Pb、Mn、P、Cr 深度67 µm(40或41个脉冲) Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Mn、Cr、(胎体元素)Sr、Rb、Y和Zr 绿色部分分析点位 表面(5或6个脉冲) (透明釉)Na、Mg、Al、Si、K、Ca、Ca+、Fe、O、Zn、Cu、Ti、Pb、Co、Cr、Mn、P 深度40 µm(25或者26个脉冲) (绿色釉彩)Na、Mg、Al、Si、K、Ca、Ca+、Fe、O、Zn、Ti、Pb、Co、Cr、Mn、B 深度56 µm(42或43个脉冲) (透明釉)Na、Mg、Al、Si、K、Ca、Ca+、Fe、O、Zn、Cu、Ti、Pb、Co、Cr、Mn、P 深度84 µm(52或53个脉冲) Na、Mg、Al、Si、K、Ca、Ca+、Fe、O、Ti、Co、Mn、(胎体)Rb、Sr、Y和Zr 表 7CZ-02的元素表面及深度分布结果
Table 7.Surface and depth distribution of different elements of CZ-02
编号 CZ-02 白色部分分析点位 表面(5个脉冲) (透明釉)Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Cr、Co、Zn、Pb、P、Cu 深度75 µm(70或者71个脉冲) Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Mn、(胎体)Sr、Rb、Y、Zr 蓝色部分分析点位 表面(5个脉冲) (透明釉)Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Co、Zn、Pb、Cu、P、Cr 深度59 µm(45或者46个脉冲) (蓝色釉彩)Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Co、Zn、Pb、Cu、B、Cl、Mn 深度308 µm(253或者254个脉冲) Na、Mg、Al、Si、K、Ca、Ca+、Ti、Fe、O、Mn、(胎体)Sr、Rb、Y、Zr -
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