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The impact of chloride desalination on the corrosion rate of archaeological iron

机译:氯化物脱盐对考古铁腐蚀速率的影响

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Although desalination of archaeological iron reduces its chloride concentration and enhances object stability, the reduction in corrosion rate that this produces has never been quantified. This study measures post-treatment corrosion rates in accelerated corrosion environments to identify the impact of removing chloride ions on corrosion rate. Thirty-five archaeological iron nails, treated individually in either alkaline sulphite or nitrogen-deoxygenated sodium hydroxide, were exposed to 75℃ and 75% relative humidity together with 31 untreated objects from the same archaeological sites. Object weight change and visual examination of physical change before and after the test period were used to monitor corrosion. 77% of treated objects showed no weight gain and no visible signs of corrosion, while 90% of untreated objects did corrode. The impact of chloride on corrosion of untreated objects was clearly established by a significant linear correlation between chloride content and weight gain. Treated objects with <400 ppm chloride content showed no corrosion behaviour. Corrosion of treated objects was attributed to incomplete treatment: 93% of objects treated to <5 mg/l CI~- in the final solution bath displayed no corrosion behaviour. Based on these results, desalination of iron objects to enhance their stability offers a valuable option for reducing corrosion rates of archaeological iron, which should increase object lifespan. The results also raise the question of whether low levels of post-treatment residual chloride produce corrosion of any significance. Answering this will be an important step forward for managing the preservation of archaeological iron.
机译:尽管考古铁的脱盐可降低其氯化物浓度并增强物体稳定性,但其产生的腐蚀速率降低从未被量化。这项研究测量加速腐蚀环境中的后处理腐蚀速率,以确定去除氯离子对腐蚀速率的影响。将35具考古亚铁钉分别用碱性亚硫酸盐或氮气脱氧的氢氧化钠处理,与来自相同考古地点的31个未经处理的物体一起暴露在75℃和75%相对湿度下。测试期间前后的物体重量变化和物理变化的目视检查用于监测腐蚀。 77%的处理过的物体没有增加重量,也没有明显的腐蚀迹象,而90%的未处理过的物体确实腐蚀了。氯化物对未处理物体腐蚀的影响通过氯化物含量和重量增加之间的显着线性相关性得到明确确定。氯化物含量<400 ppm的处理对象无腐蚀行为。处理对象的腐蚀归因于处理不彻底:在最终溶液浴中,处理后<93 mg / l CI〜-的对象中有93%没有表现出腐蚀行为。基于这些结果,对铁制物体进行脱盐处理以增强其稳定性为降低考古铁的腐蚀速率提供了宝贵的选择,这应会增加物体的使用寿命。结果还提出了一个问题,即低水平的后处理残留氯化物是否会产生任何重要的腐蚀。回答这一问题将是管理考古铁器保存的重要一步。

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