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| Simulated Corrosion Test of Q235 Steel in Diatomite Soil |
| Jian LI1,2,Hang SU1,Feng CHAI1,Xiao-ping CHEN1,Xiang-yang LI1,Hui-min MENG2 |
1. Division of Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China
2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Through the study of the corrosion behavior of Q235 steel in actual Yingtan soil and two simulated acidic soils with different water contents, the calculation of corrosion mass losses, and the analysis of the corrosion morphologies and products by means of scanning electron microscope (SEM) and X-ray diffraction (XRD), the results demonstrated that the diatomite soil could simulate the corrosion in actual soil veritably. In both actual soil and simulated soil with 16.4% water content, the corrosion rates of Q235 steel were approximately 0.1 mm/a, the corrosion morphologies were mainly extension and connection of corrosion spots on sample surface, and the corrosion products were composed of ��-FeOOH, ��-FeOOH, Fe3O4 and Fe2O3. When other media conditions remained unchanged, the corrosion area of Q235 steel was larger in simulated soil with 34.5% water content, and the corrosion rate reached 0.48 mm/a after 360 h of corrosion, which was nearly 5 times as the value in actual soil. Compared with the corrosion products in actual soil, the proportion of ��-FeOOH in simulated soil with 34.5% water content was higher, and the w��-FeOOH/w��-FeOOH ratio was 1.4, which was only 1/3 of the value in actual soil.
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Received: 09 July 2014
Published: 13 April 2015
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2015, Vol. 22 
