| 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],47(12):187-197 |
| Corrosion Behavior of Q345qNH Bridge Weathering Steel in Simulating Northwest Atmospheric Environment |
| Received:July 02, 2018 Revised:December 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.026 |
| KeyWord:Q345qNH deicing salt solution NaHSO3 solution mixed solution corrosion behavior |
| Author | Institution |
| GUO Tie-ming |
1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou , China |
| SONG Zhi-tao |
1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou , China |
| DONG Jian-jun |
2. Gansu Jiuquan Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan , China |
| ZHANG Yan-wen |
1.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou , China |
| QIN Jun-shan |
2. Gansu Jiuquan Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan , China |
| YANG Xin-long |
2. Gansu Jiuquan Steel Group Hongxing Iron & Steel Co., Ltd, Jiayuguan , China |
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| Abstract: |
| 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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