Effect of Bacillus flexus on Degradation of Polyurethane Varnish Coating in Marine Environment

doi:10.11902/1005.4537.2020.087

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (1): 36-42 DOI: 10.11902/1005.4537.2020.087

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Effect of Bacillus flexus on Degradation of Polyurethane Varnish Coating in Marine Environment

LIU Yang¹, WU Jinyi¹, YAN Xiaoyu¹, CHAI Ke²(

)

^1.School of Materials Science and Engineering, Hainan University, Haikou 570228, China
^2.Key Laboratory of Tropical Biological Resources of Ministry of Education, School of Life and Pharmaceutical Sciences, Hainan University, Haikou 570228, China

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Abstract

The effect of Bacillus flexus on degradation and corrosion behavior of polyurethane varnish coating in marine environment was investigated by means of electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The results showed that the Bacillus flexus did not exhibit significant effect on the degradation of the polyurethane varnish coating after immersion in Bacillus flexus containing seawater for 1 h. With the extension of immersion time, the corrosion resistance of the coating was significantly lower in Bacillus flexus containing seawater than that in sterile seawater, indicating that Bacillus flexus could cause the degradation of the coating. The coating resistance was about 10⁸ Ω·cm² at the initial stage of immersion both in sterile seawater and Bacillus flexus containing seawater. However, the corrosion resistance of the coating dropped to 5.22×10⁶ and 5.46×10⁶ Ω·cm² after immersion in sterile seawater for 13 and 35 d respectively. As comparison, the corrosion resistance of the coating decreased to 2.16×10⁶ and 7.96×10⁵ Ω·cm² after immersion in Bacillus flexus containing seawater for 13 and 35 d, respectively. The facts showed that the corrosion resistance of the coating in Bacillus flexus containing seawater decreased larger than that in sterile seawater. SEM observation result showed that after immersion for 35 d in Bacillus flexus inoculated seawater, numerous pores and pulverization signs could be observed of the coating surface. From the result of FTIR, the absorption peaks of N—H bond and C—O bond of coatings after immersion in Bacillus flexus containing seawater were significantly lower than that in sterile seawater, indicating that Bacillus flexus can clearly degrade the polyurethane varnish coating.

Key words: Bacillus flexus polyurethane varnish coating marine environment degradation

Received: 19 May 2020

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51761011)

Corresponding Authors: CHAI Ke E-mail: chaike888@sina.com

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LIU Yang, WU Jinyi, YAN Xiaoyu, CHAI Ke. Effect of Bacillus flexus on Degradation of Polyurethane Varnish Coating in Marine Environment. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 36-42.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.087 OR https://www.jcscp.org/EN/Y2021/V41/I1/36

Fig.1 Nyquist plots of polyurethane varnish coating immersed in sterile seawater (a) and Bacillus flexus inoculated seawater (b)

Fig.2 Equivalent electrical circuits models of 1~48 h (a), 5~35 d (b) immersion time in sterile seawater, and 1~48 h (c), 5~29 d (d), 35 d (e) immersion time in sterile seawater containing Bacillus flexus

Fig.3 Variation in the R_coat values with immersion time in sterile seawater and seawater containing Bacillus flexus

Fig.4 SEM images of surfaces of the coatings before immersion (a) and after 35 d immersion in sterile seawater (b) and seawater inoculated with Bacillus flexus (c)

Fig.5 FTIR spectra of the coating without immersion (a) and after 35 d immersion in sterile seawater (b) and seawater inoculated with Bacillus flexus (c)

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