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Journal of Chinese Society for Corrosion and protection  2018, Vol. 38 Issue (4): 326-332    DOI: 10.11902/1005.4537.2017.079
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Effect of Pseudomonas sp. on Decomposition and Anticorrosion Behavior of Polysiloxane Varnish Coating
Sanxi DENG1, Xiaoyu YAN1, Ke CHAI1(), Jinyi WU1, Hongwei SHI2
1 Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University), Ministry of Education, Material and Chemical Engineering College, Hainan University, Haikou 570228, China
2 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

The effect of Pseudomonas sp. on the decomposition and anticorrosion behavior of polysiloxane varnish coating was investigated by means of microbiological analysis, EIS, SEM and FTIR. Results showed that after 1 d immersion in seawater with Pseudomonas sp. the corrosion resistance of the coating decreased obviously, while which changed little in the sterile seawater, indicating that at the initial immersion stage Pseudomonas sp. could significantly decrease the corrosion resistance of the coating, while decompose the coating. With the extension of immersion time, both in the Pseudomonas sp. inoculated seawater and the sterile seawater, the corrosion resistance of coatings decreased obviously. While for the immersion period of 1~30 d, the decrease of corrosion resistance of coatings was obviously higher in the former seawater, suggesting that Pseudomonas sp. caused damages to the coating. For long term immersion, Pseudomonas sp. exhibits only slight effect on the corrosion resistance of the coating. Additionally, whether seawater with or without Pseudomonas sp., only one time constant could be observed in the EEC obtained by fitting the EIS data. The SEM and FTIR results revealed that the decomposition of coatings could occur to a certain extent for 30 d immersion in the Pseudomonas sp. inoculated seawater.
Key words:  Pseudomonas sp.      electrochemical impedance spectroscopy      decomposition      organiccoating     
Received:  17 May 2017     
ZTFLH:  TG174.4  
Fund: Supported by Natural Science Foundation of Hainan Province (517064), National Natural Science Foundation of China (51761011, 51261006, 51161007 and 50761004) and National Basic Research Program of China (2014CB643304)
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Sanxi DENG
Xiaoyu YAN
Ke CHAI
Jinyi WU
Hongwei SHI

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Sanxi DENG, Xiaoyu YAN, Ke CHAI, Jinyi WU, Hongwei SHI. Effect of Pseudomonas sp. on Decomposition and Anticorrosion Behavior of Polysiloxane Varnish Coating. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 326-332.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.079     OR     https://www.jcscp.org/EN/Y2018/V38/I4/326

Fig.1  Growth curve of Pseudomonas sp. in seawater
Fig.2  Nyquist (a, c) and Bode (b, d) plots of polysiloxane varnish coating immersed in sterile seawater (a, b) and Pseudomonas sp. inoculated seawater (c, d)
Fig.3  Equivalent electric circuit of EIS of polysiloxane varnish coating immersed in two different solutions
System Immersion time Rc / Ωcm2 Cc / F
Sterile seawater 1 h 4.614×109 6.428×10-11
1 d 4.590×109 6.198×10-11
3 d 3.939×109 8.667×10-11
5 d 8.425×108 1.012×10-10
13 d 9.275×108 8.324×10-10
30 d 1.172×109 1.084×10-10
90 d 5.913×108 9.312×10-10
120 d 6.877×108 9.901×10-10
Seawater inoculated with Pseudomonas sp. 1 h 6.769×109 6.813×10-11
1 d 3.202×109 6.837×10-11
3 d 3.136×109 8.156×10-11
5 d 3.240×109 1.192×10-10
13 d 3.774×109 9.855×10-9
30 d 4.044×108 9.628×10-9
90 d 6.660×108 8.754×10-11
120 d 7.119×108 1.166×10-10
Table 1  Fitting values of various electrochemical elements in the equivalent circuit model
Fig.4  SEM images of the surfaces of the coating before immersion (a) and after 30 d immersion in sterile seawater (b) and seawater inoculated with Pseudomonas sp. (c)
Fig.5  FTIR spectra of the coating before immersion (a) and after 30 d immersion in sterile seawater (b) and seawater inoculated with Pseudomonas sp. (c)
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