郭铁明,宋志涛,董建军,张延文,秦俊山,杨新龙.桥梁耐候钢Q345qNH在模拟西北大气环境中的腐蚀行为[J].表面技术,2018,47(12):187-197.
GUO Tie-ming,SONG Zhi-tao,DONG Jian-jun,ZHANG Yan-wen,QIN Jun-shan,YANG Xin-long.Corrosion Behavior of Q345qNH Bridge Weathering Steel in Simulating Northwest Atmospheric Environment[J].Surface Technology,2018,47(12):187-197 |
| 桥梁耐候钢Q345qNH在模拟西北大气环境中的腐蚀行为 |
| Corrosion Behavior of Q345qNH Bridge Weathering Steel in Simulating Northwest Atmospheric Environment |
| 投稿时间：2018-07-02 修订日期：2018-12-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.026 |
| 中文关键词: Q345qNH 除冰盐介质 NaHSO3介质 混合介质 腐蚀行为 |
| 英文关键词:Q345qNH deicing salt solution NaHSO3 solution mixed solution corrosion behavior |
| 基金项目:国家自然科学基金（51461029）；广东省“扬帆计划”引进创新创业团队专项资助（2015YT02G090） |
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| Author | Institution |
| GUO Tie-ming | 1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| SONG Zhi-tao | 1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| DONG Jian-jun | 2. Gansu Jiuquan Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan 735100, China |
| ZHANG Yan-wen | 1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| QIN Jun-shan | 2. Gansu Jiuquan Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan 735100, China |
| YANG Xin-long | 2. Gansu Jiuquan Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan 735100, China |
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| 中文摘要: |
| 目的 通过模拟西北大气环境对桥梁耐候钢腐蚀行为的影响，为西北地区桥梁钢耐蚀性能的研究提供理论依据。方法 选取除冰盐介质、NaHSO3介质、混合介质三种腐蚀介质进行干湿交替加速腐蚀实验，并采用扫描电镜+能谱、X射线衍射、电化学测试等方法，分析了Q345qNH钢在三种模拟大气环境中的腐蚀形貌、锈层特征及结构、腐蚀产物及锈层的电化学保护性。结果 Q345qNH钢在三种介质中腐蚀144 h后，腐蚀速率均明显下降，在288~480 h间，NaHSO3介质中的腐蚀速率下降趋势约是混合介质中的1.5倍、除冰盐介质中的3.8倍。三种腐蚀介质中，锈层成分均含有α-FeOOH、γ-FeOOH、Fe3O4，在除冰盐介质和混合介质中还会生成大量的不稳定β-FeOOH和可溶性FeOCl腐蚀产物，锈层疏松不稳定。此外，在NaHSO3介质中，自腐蚀电位Ecorr最高，自腐蚀电流密度Jcorr最低；除冰盐介质和混合介质中，Ecorr差别不大，但混合介质Jcorr<除冰盐介质Jcorr。对比腐蚀480 h的带锈样，稳态腐蚀区的阳极溶解电流密度有：除冰盐介质≈混合介质>NaHSO3介质。结论 Q345qNH钢在除冰盐介质中，各离子之间相互耦合，难以形成致密的保护性锈层，经过长时间的腐蚀过程，危害性最大；在NaHSO3介质中，外锈层元素富集，形成致密、稳定的保护性锈层；在除冰盐+NaHSO3混合介质中生成的锈层，其稳定性、致密性介于前两种介质中的锈层之间。 |
| 英文摘要: |
| The work aims to provide a theoretical evidence for the study on corrosion resistance of bridge steel in the northwest China by simulating the influence of the atmospheric environment on the corrosion behavior of weathering bridge steel. Three kinds of corrosion solution, including deicing salt, NaHSO3 solution, mixed solution, was selected to carry out dry-wet alternate accelerated corrosion experiment. The corrosion morphology, rust layer characteristics and structure, corrosion products and electrochemical protection of rust layer of Q345qNH steel were analyzed in three kinds of simulated atmospheric by scanning electron microscope (SEM)+energy spectrum, X-ray diffraction, electrochemical analysis and other methods. The corrosion rate of Q345qNH steel decreased significantly after 144 h corrosion in three kinds of solution. During 288 h and 480 h, the decrease of corrosion rate of NaHSO3 solution was 1.5 times of that of mixed solution and 3.8 times as much as that of deicing salt solution. The rust layer in the three kinds of corrosion solution contained α-FeOOH, γ-FeOOH and Fe3O4. In deicing salt and mixed solution, a large number of unstable β-FeOOH and soluble FeOCl were also generated, which resulted in loose and unstable rust layer. In addition, the self-corrosion potential was the highest and the self-corrosion current density was the lowest in NaHSO3 solution. Although the difference between the deicing salt and mixed solution was not significantly obvious, the Jcorr in mixed solution was less than the Jcorr of the deicing solution. Compared with the rust layer of steel corroded for 480 h, the order of the anodic dissolution current density in the steady corrosion zone was deicing salt≈mixed solution>NaHSO3. In deicing salt solution, every ion of Q345qNH steel is coupled with each other, which makes it difficult to form the dense protective rust layer. After a long period of corrosion process, it has the greatest harmfulness. In the NaHSO3 solution, the elements in outer rust layer are enriched and a dense protective rust layer is formed. In the environment of deicing salt +NaHSO3, the stability and compactness of the rust layer are between above two solutions. |
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