污损生物的附着对Q235碳钢表面钙质沉积层形成的影响

发布时间：2018-05-25 17:07

本文选题：硫酸盐还原菌 + 海洋污损生物　；参考：《中国科学院大学(中国科学院海洋研究所)》2017年硕士论文

【摘要】：近几年来,阴极保护技术已经得到了快速发展以及广泛的应用,这也为抑制处于海洋环境当中钢结构的海水腐蚀提供很好的解决方案。处于海洋环境中的钢结构被施加阴极保护之后表面都会形成一层钙质沉积层。但是海洋环境中广泛存在的海洋微生物对施加阴极保护的钢结构表面的钙质沉积层产生一定的影响。因此,研究微生物以及大型污损生物的附着对阴极保护钙质沉积层形成的影响就显得十分重要。在本实验中,我们借助扫面电镜观察、电子能谱、电化学交流阻抗和极化曲线、荧光显微镜观察等方法研究了硫酸盐还原菌附着以及海洋污损生物的附着对Q235碳钢表面阴极保护钙质沉积层形成的影响。主要实验内容包括以下几个方面:(1)极化时间对硫酸盐还原菌附着的Q235碳钢表面阴极保护钙质沉积层形成的影响;(2)硫酸盐还原菌附着时间对Q235碳钢表面阴极保护钙质沉积层形成的影响;(3)实际海洋环境中污损生物的附着对Q235碳钢表面阴极保护钙质沉积层形成的影响。通过研究我们发现在生物附着的情况下采用-30μA/cm2电流密度,极化72h获得的钙质沉积层保护性能最优。生物在碳钢的表面附着与钙质沉积层在表面的沉积能够形成竞争,污损生物的附着会使阴极保护间歇不连续,所形成的钙质沉积层也会不均匀并且规模减小,保护性减弱,同时局部腐蚀速率加快。我们的研究结果有助于探明在微生物以及大型污损生物附着的条件下阴极保护钙质沉积层形成的有利条件,为阴极保护进一步发展和实践提供理论基础。
[Abstract]:In recent years, cathodic protection technology has been rapidly developed and widely used, which also provides a good solution for the suppression of seawater corrosion of steel structures in marine environment. After cathodic protection is applied to steel structures in the marine environment, a layer of calcium deposits is formed on the surface. However, the presence of marine microbes in the marine environment has a certain effect on the calcium deposits on the surface of steel structures under cathodic protection. Therefore, it is very important to study the effect of microorganism and large fouling organisms on the formation of cathodic protection calcium deposits. In this experiment, we used scanning electron microscopy (SEM), electron spectroscopy (EDS), electrochemical impedance spectroscopy (EIS) and polarization curves. The effects of sulfate reducing bacteria and marine fouling organisms on the formation of cathodic protected calcium deposits on Q235 carbon steel were studied by fluorescence microscopy. The main contents of the experiment include the following aspects: the effect of polarization time on the formation of cathodic protection calcareous deposit layer on Q235 carbon steel surface of Q235 carbon steel) effect of bonding time of sulfate reducing bacteria on cathodic protection calcium on Q235 carbon steel surface The effect of fouling organisms on the formation of cathode protected calcium deposits on Q235 carbon steel surface. It is found that the calcium deposit with a current density of -30 渭 A/cm2 and polarization for 72 hours has the best protection performance under the condition of biological attachment. The adhesion of organisms on the surface of carbon steel and the deposition of calcium deposits on the surface can form competition, and the attachment of fouling organisms will cause intermittent discontinuity of cathodic protection, and the resulting calcareous deposits will also be uneven and smaller in size and less protective. At the same time, the local corrosion rate is accelerated. Our results are helpful to identify the favorable conditions for the formation of cathodic protection calcareous deposits under the conditions of microbes and large fouling organisms, and to provide a theoretical basis for the further development and practice of cathodic protection.
【学位授予单位】：中国科学院大学(中国科学院海洋研究所)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4

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