硫酸盐还原菌对船体低合金裸钢腐蚀行为的影响

聂淑坤; 许凤玲; 刘钊慧; 闫永贵

硫酸盐还原菌对船体低合金裸钢腐蚀行为的影响

中国船舶集团有限公司第七二五研究所海洋腐蚀与防护重点实验室, 山东青岛 266237

详细信息

作者简介:
聂淑坤,女,1997年生,硕士。

通讯作者:
闫永贵,男,主要从事电化学技术保护及应用研究。E-mail:yanyg@sunrui.net

中图分类号: TG172.5
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- 文章访问数: 108
- HTML全文浏览量: 45
- PDF下载量: 19
- 被引次数: 0
出版历程
- 收稿日期: 2022-03-22
- 网络出版日期: 2023-03-11

Effect of Sulfate-Reducing Bacteria on Corrosion Behavior of the Low-alloy Bare Steel for Hull

Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Material Research Institute, Qingdao 266237, China

摘要

摘要: 船体舱室底部存积的油污水为腐蚀微生物的生长繁殖提供了有利条件。为了研究腐蚀微生物硫酸盐还原菌(SRB)对某新型船体低合金钢腐蚀的影响,采用荧光显微技术、失重分析、电化学分析、腐蚀产物成分分析及微区成分分析等手段,研究了取自舱底环境中分离提纯的SRB对船体低合金钢腐蚀行为的影响。结果表明,在SRB腐蚀初期,胞外聚合物(EPS)对全面腐蚀有一定的抑制作用,但随着时间的延长,铁硫化合物层可作为阴极与裸露部位的小阳极发生反应,加上SRB的共同作用,加速局部破裂处的阳极溶解,促进点蚀。在整个浸泡周期内,船体低合金钢在SRB介质中的腐蚀电流密度均大于灭菌介质中的,且年平均腐蚀速率是灭菌介质中的1.36倍。
- 船体低合金钢 /
- 硫酸盐还原菌 /
- 微生物腐蚀 /
- 电化学分析 /
- 失重分析
Abstract: In some cabins inside the hull, oil and sewage are often accumulated at the bottom of the cabin due to the oil leakage of shafting and piping and the domestic sewage not cleaned in time, which provides favorable conditions for the growth and reproduction of corrosive microorganisms. The effect of sulfate-reducing bacteria (SRB), isolated and purified from bilge environment, on the corrosion of the new-type hull low alloy steel is studied by means of fluorescence microscopy, weight loss analysis, electrochemical analysis, corrosion product composition analysis and composition analysis. The results show that in the initial stage of SRB corrosion, extracellular polymer substances (EPS) have a certain inhibitory effect on the overall corrosion. However, with the extension of time, the iron sulfur compound layer can act as the cathode, together with the small anode at the exposed part and the SRB, it can accelerate the dissolution of the anode at the fracture and promote pitting corrosion. Within the 14 days of period, the corrosion current density in the SRB medium is greater than that in the sterilization medium, and the annual average corrosion rate is 1.36 times of that in the sterilization medium.
- low-alloy steel for hull /
- sulfate-reducing bacteria /
- microbial corrosion /
- lectrochemical analysis /
- weightlessness analysis

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