毛晓敏,郭娜,孙振美,郭章伟,黄诗雨,刘涛.极地低温微生物对船用EH 40钢的腐蚀行为研究[J].表面技术,2025,54(4):70-81.
MAO Xiaomin,GUO Na,SUN Zhenmei,GUO Zhangwei,HUAG Shiyu,LIU Tao.Corrosion Behavior of Marine EH 40 Steel by Polar Cryogenic Microorganisms[J].Surface Technology,2025,54(4):70-81 |
| 极地低温微生物对船用EH 40钢的腐蚀行为研究 |
| Corrosion Behavior of Marine EH 40 Steel by Polar Cryogenic Microorganisms |
| 投稿时间：2024-03-19 修订日期：2024-05-31 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.04.005 |
| 中文关键词: 极地 低温菌 微生物腐蚀 点蚀 |
| 英文关键词:polar areas pyschrophile corrosion by microorganisms pitting corrosion |
| 基金项目:上海深远海洋装备材料工程技术研究中心项目(19DZ2253100) |
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| Author | Institution |
| MAO Xiaomin | Shanghai Maritime University, Shanghai 201306, China |
| GUO Na | Shanghai Maritime University, Shanghai 201306, China |
| SUN Zhenmei | Shanghai Maritime University, Shanghai 201306, China |
| GUO Zhangwei | Shanghai Maritime University, Shanghai 201306, China |
| HUAG Shiyu | Shanghai Maritime University, Shanghai 201306, China |
| LIU Tao | Shanghai Maritime University, Shanghai 201306, China |
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| 中文摘要: |
| 目的 近年来，极地资源及航线的价值逐渐凸显，随之而来的是极地环境下船舶航行的安全问题。作为影响船舶材料腐蚀的重要因素，海冰水中的极地微生物对船用钢材腐蚀的影响研究较少。研究了两株低温菌在4 ℃条件下对EH40船用钢腐蚀行为的影响，分析了极地微生物的腐蚀机制，为未来我国北极航线上船舶用钢的开发和应用评价提供基础数据和科学参考。方法 选择了两株典型极地海冰水中的微生物(养料嗜冷杆菌Psychrobacter cibarius和南方盐单胞菌Halomonas meridiana)，采用扫描电镜(SEM)、红外光谱(FTIR)和电化学阻抗谱(EIS)等表征方法研究了EH 40船用钢在两株低温菌中的腐蚀行为。结果 从激光共聚焦和SEM电镜照片结果来看，H. meridiana在样品表面形成致密度较高的腐蚀产物膜，细菌分布均匀连续。电化学阻抗及极化结果显示，H. meridiana在实验过程中表现出更大的阻抗值及更小的腐蚀电流。空白海水培养基的失重速率最大，H. meridiana的失重速率小于P. cibarius。在4 ℃下，空白培养基中的样品出现了巨大的点蚀坑，P. cibarius组的点蚀程度较轻，出现了小点蚀坑，H. meridiana组样品表面未发现明显点蚀坑。检测两株细菌的可溶性多糖分泌量，其中H. meridiana分泌的可溶性多糖含量高于P. cibarius。结论 在4 ℃下，EH 40表现出更高的点蚀敏感度，在空白海水培养基中出现了严重的点蚀。两株低温菌附着于EH 40钢表面与腐蚀产物共同形成了具有一定防护效果的生物膜，其中H. meridiana分泌的可溶性多糖量更大，细菌附着更加均匀连续，其在样品表面形成的生物膜的致密性更高，防护效果也好于P. cibarius。 |
| 英文摘要: |
| In recent years, the significance of polar resources and shipping routes has increasingly come to the forefront, bringing attention to the issue of ship navigation safety in polar environments. When ships navigate through polar seas, they experience significant friction with ice, leading to the shedding of surface coating and direct exposure of matrix steel to seawater. The effect of polar microorganisms in sea ice water on the corrosion of ship steel is a significant yet understudied factor. These microorganisms may have a unique accelerating effect on the corrosion behavior of marine steel due to the particularity of the polar environment. The microorganisms may secrete specialized corrosion media or form distinct biofilms on the surface of steel, thereby expediting the corrosion process. In this study, two typical microorganisms (Psychrobacter cibarius and Halomonas meridiana) found in polar sea ice water were selected. Characterization techniques such as scanning electron microscopy (SEM), infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS) were employed to investigate the corrosion behavior of EH 40 marine steel in these two pyschrophile. Based on the findings from LSCM and SEM, H. meridiana was found to be uniformly and continuously distributed across the sample surface, resulting in the formation of a corrosion product film consisting of iron oxides, bacteria, and their exocrine secretions. The flatness and density of this film were observed which were higher compared to those of the corrosion product film formed by P. cibarius on the sample surface. The results of electrochemical impedance and polarization indicated that the charge transfer resistance varied with the formation and shedding of corrosion product film. The corrosion product film on the surface of P. cibarius exhibited greater instability, leading to a decrease in charge transfer resistance in the later stage. In contrast, H. meridiana demonstrated stable growth, higher impedance value, and lower corrosion current throughout the experiment. Moreover, the weight loss rate was found to be significantly elevated in the abiotic seawater medium, whereas H. meridiana demonstrated a comparatively reduced weight loss rate compared to P. cibarius. At 4 ℃, and significant pitting occurred on the samples in the control culture medium, while the P. cibarius group exhibited a relatively mild degree of pitting with small pits, and no discernible pitting was observed on the surface of the H. meridiana group. This phenomenon was attributed to the corrosion product films formed by these two bacteria on the sample surfaces. The soluble polysaccharide secretion of the two strains was quantified, with H. meridiana secreting a total content of 5.669 mg/g and P. cibarius secreting 4.980 mg/g. The soluble polysaccharide content of H. meridiana exceeded that of P. cibarius. In summary, the pitting sensitivity of EH 40 was found to be higher at 4 ℃, leading to severe pitting in abiotic seawater medium. Both strains of pyschrophile exhibited adhesion to the surface of EH 40 steel, resulting in the formation of a biofilm with certain protective properties. Notably, H. meridiana demonstrated greater secretion of soluble polysaccharides and displayed more uniform and continuous bacterial adhesion. Consequently, the biofilm formed on the sample surface was more compact and exhibited a superior protective effect compared to that formed by P. cibarius. |
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