Abstract
In this work, the deterioration of a polysiloxane coating containing nano-silica in sterile seawater and seawater inoculated with Pseudomonas was explored. The results of electrochemical impedance spectroscopy showed that the decreases in the capacitive loop diameter and the resistance of the coating were significantly higher in seawater inoculated with Pseudomonas than in sterile seawater between 1 and 24 h and between 1 h and 3 days of coating immersion, respectively. These results suggested that Pseudomonas significantly decreased the corrosion resistance of the coating and might decompose the coating after a relatively short period of immersion. However, the single time constant obtained at every immersion time and only one equivalent electrical circuit obtained for both seawater systems revealed that Pseudomonas only slightly decomposed the coating. Scanning electron microscopy and Fourier transform infrared spectroscopy confirmed a certain amount of degradation of the coating by Pseudomonas after 30 days of immersion. Additionally, when immersion time was extended, Pseudomonas influenced the capacitive loop diameter and the resistance of the coating slightly. Thus, Pseudomonas had only a slight effect on the corrosion resistance of the coating over long periods of immersion.
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Acknowledgments
The authors would like to acknowledge support from the National Basic Research Program of China (No. 2014CB643304), National Natural Science Foundation of China (No. 51261006, 51161007 and 50761004), Foundation of Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Sciences (No. MCKF201403 and MCKF201603), and Hainan University’s Key Discipline Construction Fund (No. ZXBJH-XK009 and ZXBJH-XK010).
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Chunlei, S., Ke, C., Jinyi, W. et al. Effects of Pseudomonas on the deterioration of polysiloxane coating containing nano-silica in sea water. J Coat Technol Res (2016). https://doi.org/10.1007/s11998-016-9827-z
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DOI: https://doi.org/10.1007/s11998-016-9827-z