| 摘要: |
| 采用电化学测试方法并结合显微观测技术，对混凝土模拟孔隙液中2种表面状态钢筋试件进行阳极极化试验，研究在不同氯离子浓度环境下钢筋锈蚀的变化过程.结果表明：在混凝土模拟孔隙液中无氧化皮裸筋与带氧化皮钢筋均能发生钝化，且钝化膜稳定性随氯离子浓度上升而变差，带氧化皮钢筋较无氧化皮裸筋的钝化膜更易破坏；同等氯离子浓度下，带氧化皮钢筋维钝电流较无氧化皮裸筋约大1个数量级，腐蚀更为严重. |
| 关键词: 钢筋锈蚀 电化学测试 显微观测 表面状态 |
| DOI：103969/j.issn.1007 9629201902014 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51379111) |
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| Corrosion Characteristics of Two Kinds of Surface of Steel Bars in Chloride Environment |
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XU Gang, YANG Zewen, ZHANG Rui, WANG Qing, ZENG Zhen
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Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China
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| Abstract: |
| The electrochemical technique combined with microscopic observation was used to study the anodic polarization of two kinds of steel bar specimens with different surface states in the simulated concrete pore solution, and the change process of corrosion of steel bars under different chloride ion concentrations. The results show that both steel bar without oxide skin and steel bar with oxide skin can passivate in the simulated concrete pore solution, and the stability of the passivation film becomes worse with increasing chloride ion concentration, and the steel bar with oxide skin is more vulnerable to the passivation film. With the same chloride ion concentration, the blunt current of the steel bar with oxide skin is about one order of magnitude larger than that of the steel bar without oxide skin, the corrosion of the steel bar with oxide skin is more serious. |
| Key words: steel bar corrosion electrochemical testing microscopic observation surface state |
