海洋环境中芽孢杆菌对聚氨酯清漆涂层分解的影响

doi:10.11902/1005.4537.2020.087

中国腐蚀与防护学报

2021, Vol. 41

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

研究报告

本期目录 | 过刊浏览

海洋环境中芽孢杆菌对聚氨酯清漆涂层分解的影响

刘洋¹, 吴进怡¹, 闫小宇¹, 柴柯²(

)

^1.海南大学材料科学与工程学院海口 570228
^2.海南大学生命科学与药学院热带生物资源教育部重点实验室海口 570228

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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摘要:

采用电化学技术、扫描电镜和红外光谱等多种方法研究了海洋环境中芽孢杆菌对聚氨酯清漆涂层分解作用以及对腐蚀行为的影响。结果表明，在浸泡时间为1 h时，芽孢杆菌并没有对聚氨酯清漆涂层产生明显的降解作用。随着浸泡时间的延长，在含有芽孢杆菌的海水中的涂层耐蚀性明显小于在无菌海水中涂层的耐蚀性，表明芽孢杆菌能导致涂层的降解。浸泡初期，在无菌海水和芽孢杆菌海水中，涂层电阻值约为10⁸ Ω·cm²。经无菌海水浸泡13 d后，涂层电阻值下降为5.22×10⁶ Ω·cm²，浸泡第35 d时，涂层电阻值变为5.46×10⁶ Ω·cm²。而经芽孢杆菌海水浸泡样品的涂层电阻值在浸泡13和35 d后分别为2.16×10⁶和7.96×10⁵ Ω·cm²。芽孢杆菌海水浸泡涂层电阻值的减小量明显大于无菌海水浸泡涂层电阻值的减小量。扫描电镜的结果显示，在浸泡35 d后，在芽孢杆菌海水溶液中浸泡的涂层出现大量孔洞和粉化痕迹。由红外光谱结果可以观察到，浸泡在芽孢杆菌海水的N—H键和C—O键吸收峰比无菌海水中浸泡涂层低，说明芽孢杆菌可分解涂层。

关键词 ：芽孢杆菌, 聚氨酯清漆涂层, 海洋环境, 分解

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

收稿日期: 2020-05-19

ZTFLH:

TG172

基金资助:国家自然科学基金(51761011)

通讯作者: 柴柯 E-mail: chaike888@sina.com

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

作者简介: 刘洋，男，1996年生，硕士生

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引用本文:

刘洋, 吴进怡, 闫小宇, 柴柯. 海洋环境中芽孢杆菌对聚氨酯清漆涂层分解的影响[J]. 中国腐蚀与防护学报, 2021, 41(1): 36-42.
Yang LIU, Jinyi WU, Xiaoyu YAN, Ke CHAI. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.087 或 https://www.jcscp.org/CN/Y2021/V41/I1/36

图1 聚氨酯清漆涂层在无菌海水和含芽孢杆菌海水中浸泡不同时间的Nyquist图

图2 在无菌海水中浸泡1~48 h、5~35 d和在含芽孢杆菌海水中浸泡1~48 h、5~29 d、35 d的等效电路图

图3 无菌海水和芽孢杆菌海水中Rcoat随浸泡时间的变化

图4 未浸泡、无菌和芽孢杆菌海水浸泡35 d的涂层SEM像

图5 未浸泡、无菌和芽孢杆菌海水溶液浸泡35 d后涂层的红外光谱图

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