X射线显微CT成像技术在金属文物制作工艺研究与腐蚀状态评估中的应用

金属腐蚀过程不仅受环境等外部因素的影响,制作工艺、合金组成及缺陷等内部因素同样起着重要作用。为实现金属文物制作工艺和内部腐蚀状态的可视化研究,运用X射线显微CT对铜镜文物碎片以及出土、海洋出水铁质文物样品进行扫描探测,并结合X射线荧光、X射线衍射等检测手段,开展金属文物材质、工艺及矿化程度的综合分析。结果表明,在显微CT影像重建基础上,通过设定不同的阈值,可实现文物内部缺陷、腐蚀矿化程度等内部信息的测量统计。该方法可为金属文物材质、制作工艺研究和腐蚀状态评估提供无损的研究手段。

Application of X-ray micro-CT to the manufacturing technical research and corrosion assessment of metal artifacts

The process of metal corrosion is not only affected by external factors such as the environment, but also internal factors such as manufacturing techniques, alloy compositions and defects. Seeking for visualized approaches to researching the manufacturing techniques and internal corrosion conditions of metal artifacts, we used X-ray micro-CT to scan and detect a fragment of a bronze mirror and samples of archaeological and marine archaeological iron objects. Measures of XRF and XRD were also used to complement a comprehensive analysis of the component materials, manufacturing techniques and corrosion extents of metal objects. The results show that, based on micro-CT image reconstruction, the internal information of artifacts such as internal defects and corrosion extents could be measured and counted by setting different thresholds. This work provides a nondestructive research method for the study of alloy materials and manufacturing techniques as well as the corrosion assessment of metal artifacts.