| MAO Xiao-min,LIU Tao,GUO Na,GUO Zhang-wei,DONG Li-hua.Corrosion Behavior of Marine Low Alloy Steel under the Condition of Multi-factor Coupling in Simulated Arctic Route[J],51(6):36-47 |
| Corrosion Behavior of Marine Low Alloy Steel under the Condition of Multi-factor Coupling in Simulated Arctic Route |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.06.004 |
| KeyWord:microbiological corrosion low alloy steel pitting corrosion biomineralization the alternating environment |
| Author | Institution |
| MAO Xiao-min |
Shanghai Maritime University, Shanghai , China |
| LIU Tao |
Shanghai Maritime University, Shanghai , China |
| GUO Na |
Shanghai Maritime University, Shanghai , China |
| GUO Zhang-wei |
Shanghai Maritime University, Shanghai , China |
| DONG Li-hua |
Shanghai Maritime University, Shanghai , China |
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| Abstract: |
| This study aims to investigate the corrosion of low alloy steel during the simulated voyage from the South China Sea to the North Pole, and to explore the corrosion mechanism under the alternating environmental conditions. Three temperatures (37 ℃, 25 ℃, 4 ℃) and corresponding typical marine bacteria were selected, including Pseudoalteromonas atlantica, Vibrio natriegens and Psychrobacter cibarius. The change of Marine alternating environment during voyage and round trip was simulated. The experiment cycle was 21 days, and the temperature and bacteria species were changed every 7 days. Scanning electron microscopy (SEM), a three-dimensional (3D) optical profilometer, weight loss method and electrochemical test methods were used to characterize and analyze the corrosion behavior of materials from both macro and micro aspects. Meanwhile, the same low alloy steel samples were immersed in sterile seawater for the control experiment. In abiotic seawater, from 37 ℃ to 4 ℃, the corrosion rate of low alloy steel decreased significantly. From 4 ℃ to 37 ℃, the pitting corrosion of low alloy steel is more serious, but the corrosion rate changed inapparently. In the biotic seawater, from 37 ℃ to 4 ℃, a large amount of calcium carbonate and magnesium salt were deposited on the surface of the low-alloy sample, thereby inhibiting the uniform and pitting corrosion significantly. However, from 4 ℃ to 37 ℃, the surface of the low-alloy steel sample showed serious corrosion, and serious pitting corrosion was found after removing the corrosion products. X-ray energy dispersive spectroscopy (EDS) proved that the calcium and magnesium carbonates were not deposited on the steel surfaces under low-temperature environment. Therefore, the difference of initial seawater temperature and bacteria species can cause great difference in the corrosion behavior of marine low-alloy steel. The main reason is that bacteria can induce the deposition of calcium and magnesium carbonate on the surface of low-alloy steel samples at high temperature, which can obviously inhibit the corrosion. However, under low temperature environment, P. cibarius can hardly induce calcium and magnesium carbonate deposition, and the uniform corrosion and pitting corrosion of samples will be very serious. Once corrosion occurs, it is difficult to play a good protective role even if the mineralized product film is formed later. |
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