X-ray photoelectron spectroscopy and electrochemical studies of mild steel FeE500 passivation in concrete simulated water

F. Miserque, B. Huet, G. Azou, D. Bendjaballah, V. L'Hostis
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引用次数: 20

Abstract

In the context of the prediction of the long-term behaviour of reinforced concrete structures involved in the nuclear waste storage, the corrosion mechanisms of steels have to be assessed. When mild steel rebars are embedded in concrete, the chemical environment of the reinforcement is progressively modified, due to the carbonation of the concrete matrix. This modification leads to the variation of iron oxides properties formed at the steel/concrete interface, and the active corrosion can be initiated. The aim of this study is to evaluate the passivation behaviour and to provide insights into the depassivation of mild steel in concrete pore solution. In a young concrete, due to the alkalinity of the interstitial solution, steel reinforcement remains passive. Immersion tests of mild steel substrate in various alkaline solutions (from pH 13 to 10) have been performed. Due to the low thickness of the corrosion layers formed, X-ray photoelectron spectroscopy has been used to characterize them. In the passive domain, the corrosion products are similar for the various solutions. The corrosion layer is composed of a mixture of Fe 3+ and Fe 2+ . A similar approach is used to determine the depassivation mechanism. The effect of various components such as carbonates, sulfates and silicates resulting from the dissolution of minerals of cement during the carbonation process is investigated. In addition to the surface analysis, the evolution of the electrochemical behaviour as function of the solution nature (pH) is evaluated with the help of electrochemical measurements (free corrosion potential, cyclic voltamperometry).
低碳钢fe500在混凝土模拟水中钝化的x射线光电子能谱和电化学研究
在预测核废料储存所涉及的钢筋混凝土结构的长期行为时,必须评估钢的腐蚀机制。当低碳钢钢筋嵌入混凝土中时,由于混凝土基体的碳化作用,钢筋的化学环境会逐渐改变。这种改性导致在钢/混凝土界面处形成的氧化铁性能发生变化,从而引发活性腐蚀。本研究的目的是评估钝化行为,并为低碳钢在混凝土孔隙溶液中的钝化提供见解。在新混凝土中,由于空隙溶液的碱度,钢筋仍然是被动的。低碳钢基材在各种碱性溶液(pH值从13到10)中的浸泡试验已经完成。由于形成的腐蚀层厚度低,x射线光电子能谱被用来表征它们。在被动领域,不同溶液的腐蚀产物是相似的。腐蚀层由fe3 +和fe2 +的混合物组成。用类似的方法来确定脱钝化机理。研究了水泥在碳化过程中矿物的溶解所产生的碳酸盐、硫酸盐和硅酸盐等各种组分的影响。除了表面分析,电化学行为的演变作为溶液性质(pH)的函数的评估与电化学测量(自由腐蚀电位,循环伏安法)的帮助下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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