Microstructural characteristics of steel corrosion products under carbonation and chloride salt
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摘要: 通过XPS与XRD方法研究了碳化与氯盐腐蚀作用下砂浆内钢筋锈蚀物的组成和微结构特征，阐明了砂浆内钢筋的腐蚀机制。研究结果表明：从氯盐、碳化到氯盐与碳化复合作用，钢筋锈蚀物中Fe的峰值逐渐增强，Fe的氧化物含量增多，钢筋锈蚀越来越严重；在钢筋腐蚀过程中，钢筋表面的FeO和Fe3O4等较致密的钝化膜结构会转化为Fe3+，且Fe3+与水泥的水化产物Ca2SiO4形成Fe3+-Ca2SiO4复盐，随着钢筋腐蚀程度的加剧，Fe3+-Ca2SiO4复盐含量逐渐减少，而Fe3+转化为以Fe2O3为主的其他锈蚀物。Abstract: The microstructural characteristics of steel corrosion products in mortar under effect of carbonation and chloride salt environment were investigated by XPS and XRD. The results reveal that the peak value of iron in the corrosion products gradually increases from chloride salt and carbonization to the combination of chloride and carbonization, and the corrosion degree of reinforcement becomes more serious. In the course of corrosion, the compact structure of FeO and Fe3O4 on the surface of reinforcement will be transformed into Fe3+, and the Fe3+ would form the complex salt of Fe3+-Ca2SiO4 with the hydration products of Ca2SiO4. With the increase of corrosion degree of reinforcement, the salt content of Fe3+-Ca2SiO4 would gradually decrease, and Fe3+ would be transformed into Fe2O3 based other forms of rust.
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Keywords:
- mortar /
- carbonation /
- chloride salt /
- corrosion product /
- microstructural characteristics
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期刊类型引用(6)
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