在不同腐蚀环境下对铜器上生层腐蚀行为的比较研究
Bingbing Li1,2, Qixing Xia1,2, Wenqiang Dong1,2
1Cultural Heritage Research Institute, Northwestern Polytechnical University, Xi'an 710072, China.
Materials (Basel, Switzerland)
|March 27, 2025
概括
离子通过形成不稳定的生层来加速青铜的腐蚀,增加了降解. 然而,考古土壤环境促进了稳定的生,增强了青铜文物的保存.
科学领域:
- 材料科学 材料科学 材料科学
- 考古学测量是指考古学测量的方法.
- 腐蚀科学 腐蚀科学
背景情况:
- 青铜文物容易通过腐蚀过程降解.
- 了解青铜腐蚀机制对于有效的保护策略至关重要.
研究的目的:
- 为了研究和比较Cu-Sn铜合金在富含化物 (NaCl) 和模拟考古土壤溶液中的腐蚀行为.
- 阐明离子在青铜上有害的生层的形成中的作用.
主要方法:
- 电化学测量 (腐蚀速率,极化电阻)
- 显微镜观察的结果
- 在X射线衍射 (XRD) 中.
- 在X射线光电子光谱学 (XPS) 中.
主要成果:
- 离子 (Cl-) 是形成有害的的关键,如Cu2(OH)Cl3.
- 在NaCl溶液中,不稳定的含酸盐的层导致腐蚀率增加 (i_corr从4.8到27.2μA·cm-2),极化阻力降低 (Rp从5.17到3.27kΩ·cm-2).
- 在模拟土壤中,形成了稳定,密集的生层,其腐蚀率明显较低 (i_corr < 1.6 μA·cm−2) 和较高的极化阻力 (Rp > 24 kΩ·cm2),提高了两倍的耐腐蚀性.
结论:
- 离子通过增加生层的湿透性和促进腐蚀性介质的透,促进青铜的降解.
- 在考古土壤环境中,腐蚀的攻击性较小,原因是形成了保护性,稳定的生层.
- 这项研究为制定青铜文物有针对性的保护策略提供了科学基础.
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