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| Corrosion Behavior of High-strength Steel under Polar Low-temperature Freeze-thaw Cycle Environment |
| Received:May 09, 2024 Revised:June 14, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.07.008 |
| KeyWord:polar environment low temperature high-strength steel freeze-thaw cycle corrosion electrochemistry |
| Author | Institution |
| XIN Yonglei |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| PENG Wenshan |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| WEN Jieping |
Marine Chemical Research Institute, Shandong Qingdao , China |
| HOU Jian |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| SUN Mingxian |
National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
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| Abstract: |
| The harsh natural environment of low temperature, high humidity and high salt in polar atmosphere may cause severe corrosion of high-strength steel. Therefore, the work aims to investigate the effect of polar atmosphere on high-strength steel corrosion and clarify the corrosion mechanism. Indoor simulation experiments were conducted and methods such as weight loss testing, electrochemical testing, and corrosion product analysis were adopted to study the corrosion mechanism of Ni-Cr-Mo-V high-strength steel in polar atmosphere of ‒45~5 ℃ low-temperature freeze-thaw cycle. With the extension of the test cycle, the corrosion of high-strength steel deepened to varying degrees. After two months, a relatively thick rust layer was formed, with a large amount of loose corrosion products inside. After exposure for three months, it was found that the metal surface was covered by corrosion products, and cracks appeared in the surface corrosion layer. The results of AC impedance testing and dynamic potential polarization testing showed that the capacitance arc radius and corrosion potential of high-strength steel varied greatly, and its corrosion resistance was weak. XRD and Raman spectroscopy were used to characterize the corrosion components, and it was found that in the low-temperature freeze-thaw cycle environment, the corrosion products of high-strength steel were mainly α-FeOOH, β-FeOOH, γ-FeOOH and Fe3O4/γ-Fe2O3. With the low-temperature freeze-thaw cycle time increasing, the corrosion resistance of high-strength steel deteriorates continuously. |
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