Corrosion behavior of the chitosan-zinc composite films in sulfate-reducing bacteria
Corrosion behavior of the chitosan-zinc composite films in sulfate-reducing bacteria
复制标题
壳聚糖-锌复合膜在硫酸盐还原菌中的腐蚀行为
DOI：
10.1016/j.surfcoat.2018.03.032
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发表时间：
2018-06-25
影响因子：
5.4
通讯作者：
Hou, Baorong
中科院分区：
文献类型：
--
作者：
Zhai, Xiaofan;Li, Ke;Hou, Baorong
硫酸盐还原菌（SRB）是海洋环境中微生物腐蚀的主要诱因之一。在我们前期的工作中，电沉积了一种新型的壳聚糖-锌薄膜，并发现其具有有效的抗菌性能，因此研究壳聚糖-锌薄膜在SRB介质中的腐蚀行为对于评估该薄膜在实际海洋环境中的应用具有重要意义。本文通过SRB代谢检测、电化学方法和表面分析等手段研究了其腐蚀行为。在SRB中暴露6 d后，通过对环境腐蚀因子的监测，发现SRB的生长和代谢受到明显抑制。通过腐蚀速率的计算和表面形貌的分析，壳聚糖-锌膜具有较高的耐腐蚀性能。暴露后，锌膜表面形成生物膜和腐蚀产物，壳聚糖-锌复合膜表面附着腐蚀产物层，腐蚀产物层中细菌含量较少。电化学测试结果表明，壳聚糖的加入并没有改变膜的阳极和阴极行为，但在一定程度上降低了SRB介质的腐蚀能力，抑制了细菌的附着，提高了膜的电导率，从而提高了膜的耐蚀性。
Sulfate-reducing bacteria (SRB) are one of the chief inducers of microbiologically influenced corrosion in marine environment. In our previous work, a novel chitosan-zinc film was electrodeposited and found to be effectively antibacterial, so research on the corrosion behavior of chitosan-zinc films in SRB medium is highly significant for estimating the films to be applied in real-sea environment. In this paper, detection of SRB metabolism, electrochemical methods and surface analyses were performed to clarify the corrosion behavior. During 6 d exposure in SRB, obvious inhibition on SRB growth and metabolism were found by monitoring the environment corrosive factors. By calculating the corrosion rate and analyzing surface morphologies, chitosan-zinc films showed relatively high corrosion resistance. After exposure, biofilm together with corrosion products formed on zinc film, while corrosion product layer with little bacteria attached on chitosan-zinc composite film. Further electrochemical results showed that the addition of chitosan did not change the anodic and cathodic behavior of the films, but enhanced the corrosion resistance by reducing the corrosive ability SRB medium, inhibiting bacteria attachment and raising the films' electric conductibility to a certain extent.