|
| Influences of Marine Microorganisms Mucilage Secretion (EPS) on Corrosion Behavior of Marine Structure Steels |
| Received:September 10, 2017 Revised:January 15, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.01.018 |
| KeyWord:extracellular polymeric substances microbially-influenced corrosion electrochemical impendence seawater |
| Author | Institution |
| ZHANG Shen |
Shanghai Maritime University, Shanghai , China |
| GUO Na |
Shanghai Maritime University, Shanghai , China |
| DONG Yao-hua |
Shanghai Maritime University, Shanghai , China |
| DONG Li-hua |
Shanghai Maritime University, Shanghai , China |
| LIU Tao |
Shanghai Maritime University, Shanghai , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To explore the relationship between bacterial activity and corrosion behavior of hull steel and research influences of concentration of extracellular polymeric substances (EPS) on corrosion. Methods Fourier transform infrared spectroscopy (FT–IR) and ICP-OES such as inductive coupling were used to analyze composition of EPS and content of iron ion. The morphology of corrosion products was analyzed by atomic force microscope (AFM). Results The fitting analysis of electrochemical impendence showed that EPS inhibited corrosion by hindering scattering of dissolved oxygen, the greater the concentration, the better the effect. That is to say, the corrosion speed of specimen in the initial state was inversely proportional to the EPS concentration. Therefore, although its complexation effect could promote anodic dissolution of the specimen, its effect was limited. It was the mainly the EPS which inhibited scattering of dissolved oxygen. For EPS solution of high concentration, excessive EPS could promote more bonding between functional group of EPS and Fe2+/Fe3+on material surface, as a result, the EPS protective film might become loose and be unable to separate the dissolved oxygen and thus accelerate corrosion of specimen. Conclusion Effects of EPS on corrosion of hull steel is relevant to structure and concentration of EPS. EPS changes from inhibiting corrosion to accelerating corrosion with the increase of concentration. |
| Close |
|
|
|