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中国腐蚀与防护学报  2018, Vol. 38 Issue (4): 326-332    DOI: 10.11902/1005.4537.2017.079
  研究报告 本期目录 | 过刊浏览 |
假单胞菌对聚硅氧烷树脂清漆涂层分解及防腐蚀行为的影响
邓三喜1, 闫小宇1, 柴柯1(), 吴进怡1, 史洪微2
1 海南大学材料与化工学院 热带岛屿资源先进材料教育部重点实验室 海口 570228
2 中国科学院金属研究所 中国科学院核用材料与安全评价重点实验室 沈阳 110016
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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摘要: 

利用微生物分析、EIS、SEM和FTIR等方法研究了海水中假单胞菌对聚硅氧烷树脂清漆涂层的分解及防腐蚀行为的影响。结果表明,浸泡时间在1 d内时,涂层在含假单胞菌海水中的腐蚀阻抗明显下降,而在无菌海水中则变化很小,表明假单胞菌在浸泡初期能够极大地降低涂层的腐蚀阻抗并能分解涂层。而随着浸泡时间的延长,两种环境下涂层的腐蚀阻抗均明显减小。涂层在含假单胞菌海水中浸泡1~30 d的腐蚀阻抗的减少量明显大于其在无菌海水中的减小量,表明浸泡30 d后假单胞菌对涂层结构造成了破坏。而当在长时间浸泡情况下,假单胞菌对于涂层腐蚀阻抗仅有轻微影响。无论是在无菌海水还是在含假单胞菌海水中,通过拟合电化学数据得到的等效电路模型中仅有一个时间常数。SEM和FTIR分析结果表明,浸泡30 d时假单胞菌能在一定程度上分解涂层。
关键词 ： 假单胞菌,  电化学阻抗谱,  分解,  有机涂层    
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
收稿日期: 2017-05-17     
ZTFLH:  TG174.4  
基金资助:海南省自然科学基金 (517064),国家自然科学基金 (51761011,51261006,51161007和50761004) 及国家重点基础研究发展计划 (2014CB643304)
作者简介:

作者简介 邓三喜,男,1994年生,硕士生
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引用本文:

邓三喜, 闫小宇, 柴柯, 吴进怡, 史洪微. 假单胞菌对聚硅氧烷树脂清漆涂层分解及防腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2018, 38(4): 326-332.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.079      或      https://www.jcscp.org/CN/Y2018/V38/I4/326

图1  假单胞菌在海水中的生长曲线
图2  聚硅氧烷清漆涂层在无菌海水和假单胞菌海水溶液中的Nyquist图和Bode图
图3  聚硅氧烷树脂清漆涂层暴露于不同环境时EIS的等效电路
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
表1  等效电路中各元件参数拟合值
图4  未浸泡、经无菌海水和含假单胞菌海水浸泡30 d后的涂层表面SEM像
图5  未浸泡、经无菌海水和含假单胞菌海水浸泡30 d后涂层的FTIR谱
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