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首页> 外文期刊>Corrosion Engineering, Science and Technology >In situ structural characterisation of nonstable phases involved in atmospheric corrosion of ferrous heritage artefacts
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In situ structural characterisation of nonstable phases involved in atmospheric corrosion of ferrous heritage artefacts

机译：涉及铁质文物的大气腐蚀的不稳定相的原位结构表征

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摘要

The prediction of very long term corrosion of iron and low alloy steel in atmospheric conditions or in hydraulic binder media is a crucial issue for the conservation and restoration of heritage artefacts. For both media, the typical iron corrosion product layers (CPL) can be described as a matrix of goethite (α-FeOOH) crossed by marblings of reactive phases: maghemite (γ-Fe_2O_3), ferrihydrite (Fe_5HO_8·H_2O), feroxyhyte ((δ-FeOOH), etc. The aim of the experiments presented here is to bring new insights on the role that the maghemite could "potentially play in the mechanisms of corrosion. For that purpose, electrochemical reductions have been coupled with in situ Raman microspectroscopy. These experiments enable the authors to propose a hypothesis of local mechanisms in the specific case of marblings of maghemite connected to the metallic substrate. These local mechanisms could drastically influence the global corrosion rate.
机译：对于铁和低合金钢在大气条件下或在水硬性粘结剂介质中的长期腐蚀的预测，对于保存和修复遗留文物至关重要。对于这两种介质，典型的铁腐蚀产物层（CPL）都可以描述为针铁矿（α-FeO​​OH）的基质与反应相大理石花纹交叉：磁赤铁矿（γ-Fe_2O_3），三水铁矿（Fe_5HO_8·H_2O），亚铁酸盐（（这里提出的实验的目的是对磁赤铁矿“可能在腐蚀机理中发挥的作用”提供新的见解。为此，电化学还原已与原位拉曼光谱法相结合。这些实验使作者能够提出假设，即在磁赤铁矿与金属基质连接的大理石花纹的特殊情况下，局部机理的假设，这些局部机理可能会严重影响整体腐蚀速率。

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