The Influence of Relative Humidity and Intrinsic Chloride on Post-excavation Corrosion Rates of Archaeological Wrought Iron

The Influence of Relative Humidity and Intrinsic Chloride on Post-excavation Corrosion Rates of Archaeological Wrought Iron
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相对湿度和内在氯化物对考古熟铁开挖后腐蚀速率的影响

DOI:
10.1080/00393630.2018.1565006
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发表时间:
2019
影响因子:
0.8
通讯作者:
Watkinson D
Watkinson D
中科院分区:
化学4区
文献类型:
--
作者:
Watkinson D

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本研究探讨了相对湿度(RH)对129个考古铁钉从两个网站的腐蚀速率的影响。使用受控RH中单个指甲的氧气消耗量作为腐蚀速率代表,以提供腐蚀速率随RH变化的定量数据。这在20% RH下可忽略不计,两个地点的相对湿度缓慢上升至40% RH,Caerleon(威尔士)的罗马钉子在60% RH下迅速增加,Billingsgate(伦敦)的中世纪钉子在70% RH下迅速增加。消化指甲,测定其氯化物含量,并与特定RH值下的耗氧量相关。虽然确定了作为氯化物函数的一般腐蚀模式,但对于任何单一浓度的氯化物,腐蚀速率都是不可预测的。干燥通常用于控制考古铁的挖掘后腐蚀;量化不同程度的干燥如何改变腐蚀速率,为识别腐蚀风险,估计物体寿命和计算存储选项的成本效益提供了一个缩放工具。
This study examined the impact of relative humidity (RH) on the corrosion rate of 129 archaeological iron nails from two sites. Oxygen consumption of individual nails in controlled RH was used as a corrosion rate proxy to deliver quantitative data on corrosion rate as a function of RH. This was negligible at 20% RH, slow up to 40% RH for both sites, and increased rapidly at 60% RH for Roman nails from Caerleon (Wales) and at 70% RH for medieval nails from Billingsgate (London). The nails were digested and their chloride content was determined and related to their oxygen consumption at specific RH values. While a generic pattern of corrosion as a function of chloride was identified, for any single concentration of chloride corrosion rate was not predictable. Desiccation is in common use to control post-excavation corrosion of archaeological iron; quantifying how differing levels of desiccation changed corrosion rate provided a scaled tool for identifying corrosion risk, estimating object longevity, and calculating cost benefit for storage options.
DOI: 10.1016/j.corsci.2004.05.029
发表时间: 2005-02-01
期刊: CORROSION SCIENCE
影响因子: 8.3
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