Abstract
As a part of Corrosion Map of Sichuan project, atmospheric corrosion behavior of carbon steel was investigated in the subtropical atmospheric environment by weight loss method at five exposure stations. Results indicated that an annual corrosion rate of carbon steel was between 0.66 and 23.6 μm/y. The morphology and composition of corrosion products formed on the exposed steels were identified by scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS) and Raman spectroscopy. Subtropical atmospheric corrosion rate of the steel increases in high-rainfall and temperature environment. Bigger and deeper pits are preferred to form in a humid atmosphere. The corrosion products exhibited an uneven distribution and consisted mainly of goethite (α-FeOOH), lepidocrocite (γ-FeOOH), magnetite (Fe3O4) and hematite (Fe2O3). The electrochemical corrosion of carbon steel in solution is an activation-controlled process, and a stable passive region was not observed for the steel. Electrochemical measurements showed that deposits on carbon steel decreased the corrosion resistance.
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Acknowledgments
This work was jointly supported by the Fundamental Research Funds for the Central Universities (No. FRF-MP-18-002) and the Science and Technology Project of State Grid Sichuan Electric Power Corporation of China (No. 521997160013).
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Hai, C., Wang, Z., Lu, F. et al. Analysis of Corrosion Evolution in Carbon Steel in the Subtropical Atmospheric Environment of Sichuan. J. of Materi Eng and Perform 30, 8014–8022 (2021). https://doi.org/10.1007/s11665-021-06019-1
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DOI: https://doi.org/10.1007/s11665-021-06019-1