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| Impact of Pseudoalteromonas sp. on Galvanic Corrosion between B10 and EH40 |
| Received:August 23, 2018 Revised:October 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.10.013 |
| KeyWord:galvanic corrosion EH40 B10 Pseudoalteromonas sp. |
| Author | Institution |
| GAO Jie-yan |
1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao , China; 2. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China; 3. Qingdao National Laboratory for Marine Science and Technology, Qingdao , China; 4. University of Chinese Academy of Sciences, Beijing , China |
| WU Jia-jia |
1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao , China; 2. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China; 3. Qingdao National Laboratory for Marine Science and Technology, Qingdao , China |
| ZHANG Dun |
1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao , China; 2. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China; 3. Qingdao National Laboratory for Marine Science and Technology, Qingdao , China |
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| Abstract: |
| Objective To study the impact of Pseudoalteromonas sp. (P.sp.) on galvanic corrosion between B10 and EH40. Methods EH40/B10 galvanic current, couple potential and open circuit potential were carried out on an electrochemical work-station. The corrosion morphology and biofilms of EH40 and B10 after 21 days of immersion were observed by scanning electron microscopy and laser scanning confocal microscope, respectively. And the concentration of dissolved oxygen, pH and the number of P.sp. of the medium were also measured. Results The galvanic current and the theoretical driving voltage in the abiotic medium were much larger than that in the medium containing P.sp. According to corrosion morphology, the corrosion of coupled B10 was lighter than decoupled B10 in abiotic medium, while the coupling had little effect on the corrosion of EH40 and B10 in the P.sp. inoculated medium. The concentrations of dissolved oxygen and pH in the P.sp. The inoculated medium were lower than those in the abiotic medium. Conclusion The galvanic corrosion rate between B10 and EH40 in the abiotic medium was much higher than that in the P.sp. inoculated media, which is mainly due to oxygen consumption and biofilm formation of P.sp. Furthermore, coupled B10 is protected by cathodic protection from EH40 and less corrosive than decoupled B10 in the abiotic medium. However, the effect of coupling on the corrosion of EH40 and B10 is not significant in the P.sp. inoculated media, and the effect of galvanic corrosion is quite limited. |
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