内锈层微生物对碳钢腐蚀行为的影响研究

发布时间：2017-12-30 23:14

本文关键词：内锈层微生物对碳钢腐蚀行为的影响研究　出处：《中国科学院研究生院(海洋研究所)》2016年硕士论文　论文类型：学位论文

【摘要】：随着经济的发展,资源短缺环境恶化的形势进一步加剧,海洋成为现在以及未来发展的重要场所。由于溶解了多种物质,海水性质因此更加特殊,其高盐分的特征使得材料容易受到侵蚀。而海洋腐蚀是制约海洋产业发展的重要因素,不仅造成资源的巨大浪费更会引发不必要的灾难,损失不可估量。微生物广泛存在于海洋环境中,微生物腐蚀是海洋腐蚀中不容忽视的重要组成部分。硫酸盐还原菌,铁细菌,锰氧化细菌等微生物都是海洋环境中引起金属材料腐蚀的重要微生物类群。随着海洋腐蚀的研究深入,微生物腐蚀机理等研究也开启了新的格局,为微生物腐蚀防治工作提供了必要的理论基础。本论文尝试从天然海水环境中浸泡过的碳钢锈层中分离出腐蚀相关性纯微生物,对可培养微生物多样性做相应分析,并进一步研究了不同种类的微生物(包括好氧菌、硫酸盐还原菌和铁细菌)对碳钢腐蚀行为的影响。分别用2216E和PGC从碳钢锈层中分离出21株和13株细菌,并进一步对该锈层中可培养的细菌做了16S rDNA系统发育分析。分析结果表明碳钢锈层中有丰富的微生物类群,其中,无芽孢杆菌属占有最大比例。通过腐蚀失重实验,电化学实验以及表面分析技术研究了内锈层中微生物对碳钢的腐蚀,研究发现好氧菌对碳钢的腐蚀行为影响较小,主要是通过降低介质中氧气的浓度,减小氧的去极化而抑制碳钢的腐蚀。纯种硫酸盐还原菌能够极大的提高碳钢的腐蚀速率,其存在下点蚀现象严重,相对而言,混合的硫酸盐还原菌并不能明显增加碳钢腐蚀,并且从失重实验反应其腐蚀速率还有略微减小。铁细菌在浸泡的短期内,加速碳钢腐蚀,但后期腐蚀速率反而减小。
[Abstract]:With the development of economy, the shortage of resources environmental deterioration of the situation further exacerbated, and the future development of the ocean is now becoming an important place. Due to a variety of substances dissolved in seawater, so the more special properties, the high salinity characteristics that make the material susceptible to erosion. The marine corrosion is an important factor restricting the development of the marine industry, not only caused a huge waste more resources will lead to unnecessary disaster, immeasurable loss. Microorganisms are ubiquitous in the marine environment, microbial corrosion is an important part of marine corrosion. The sulfate also pathogenic bacteria, iron bacteria, Manganese Oxidizing Bacteria and other microorganisms are caused by microbial corrosion of metal materials in the marine environment. With the study of ocean the in-depth study of microbial corrosion, corrosion mechanism also opened a new pattern, provides the necessary physical work for the prevention of microbial corrosion On the basis of this thesis. Correlation between microbial separation corrosion rust layer of carbon steel out from natural seawater soaked in the culturable microbial diversity do the corresponding analysis, and further study the different types of microorganisms (including aerobic bacteria, sulfate reducing bacteria and iron bacteria) influence on the corrosion behavior of carbon steel respectively. With 2216E and PGC from the rust layer of carbon steel in 21 strains and 13 strains of bacteria, and further to the rust layer of bacteria do phylogenetic analysis 16S rDNA system. The results show that there are abundant microbial populations, the rust layer of the carbon steel, bacteridium have the largest proportion. The corrosion weight loss the electrochemical experiments and surface analysis techniques of microbial corrosion in the inner rust layer of steel, the study found that the smaller the corrosion behavior of aerobic bacteria on carbon steel, mainly through the decrease in the concentration of medium oxygen gas To reduce corrosion, polarization of oxygen and inhibit carbon steel. Pure sulfate reducing bacteria can greatly improve the corrosion rate of carbon steel, the presence of pitting phenomenon is serious, relatively speaking, mixed sulfate reducing bacteria can not significantly increase the corrosion of carbon steel, and the corrosion rate of the weight loss test reaction and iron bacteria in soaking decreases slightly. In the short term, to accelerate the corrosion of carbon steel, but the corrosion rate decreases.

【学位授予单位】：中国科学院研究生院(海洋研究所)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P755.3

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