脱硫弧菌和溶藻弧菌对船体结构材料907钢海水腐蚀行为的影响研究

doi:10.11902/1005.4537.2017.024

中国腐蚀与防护学报

2017, Vol. 37

Issue (5): 402-410 DOI: 10.11902/1005.4537.2017.024

研究报告

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脱硫弧菌和溶藻弧菌对船体结构材料907钢海水腐蚀行为的影响研究

陈菊娜^1,^2,³,吴佳佳¹,王鹏¹,张盾¹(

)

1 中国科学院海洋研究所中国科学院海洋环境腐蚀与生物污损重点实验室青岛 266071
2 中国科学院大学北京 100049
3 海军航空大学烟台 264001

Effect of Desulfovibrio sp. and Vibrio Alginolyticus on Corrosion Behavior of 907 Steel in Seawater

Juna CHEN^1,^2,³,Jiajia WU¹,Peng WANG¹,Dun ZHANG¹(

)

1 Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Naval Aeronautical University, Yantai 264001, China

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摘要:

利用失重法、表面分析方法与电化学方法研究了脱硫弧菌 (属于硫酸盐还原菌) 和溶藻弧菌单独及共存时对船体结构材料907钢在海水中腐蚀的影响。结果表明,腐蚀速率大小顺序为：混合菌<溶藻弧菌<无菌海水≈ 脱硫弧菌。O₂的存在及营养物质的匮乏,抑制了脱硫弧菌的存活和繁殖,907钢腐蚀速率在脱硫弧菌中与无菌对照中的相似。相反地,溶藻弧菌在以上环境中可以很好地生存,并且抑制了907钢的腐蚀过程,这与细菌通过消耗O₂进行的代谢增殖活动有关。在混合菌体系 (脱硫弧菌和溶藻弧菌) 中,907钢的腐蚀过程进一步被抑制,这是由于混合菌体系中形成的致密生物膜对腐蚀的深入发展造成阻碍,腐蚀抑制作用更加明显。

关键词 ：船体结构材料, 微生物腐蚀, 脱硫弧菌, 溶藻弧菌

Abstract：

The corrosion behavior of 907 steel, as hull structural material, in seawater with mono-, and di-cultures of Desulfovibrio sp. (belonging to sulphate-reducing bacteria) and Vibrio alginolyticus was studied by means of weight loss- and electrochemical-method, as well as surface analysis methods. The results demonstrated that the corrosion rate of the steel in seawaters can be ranked increasingly as the following: Desulfovibrio sp.+Vibrio alginolyticus<Vibrio alginolyticusDesulfovibrio sp. The metabolism of Desulfovibrio sp. was inhibited due to the lack of nutrient substances and the presence of oxygen, and the corrosion rate of 907 steel in the seawater with Desulfovibrio sp. was the same as that in sterile seawater. However, Vibrio alginolyticus metabilited well in the test condition, and the presence of Vibrio alginolyticus may inhibit the corrosion of 907 steel due to that the oxygen was removed by metalism of Vibrio alginolyticus. The corrosion of 907 steel was further inhibited in the presence of mixed Desulfovibrio sp. and Vibrio alginolyticus, which may facilitate the formation of compact biofilm on the surface of 907 steel.

Key words： hull structural material microbiologically influenced corrosion Desulfovibrio sp. Vibrio alginolyticus

收稿日期: 2017-02-14

基金资助:国家重点研发计划 (2016YFB0300604) 和国家重点基础研究发展计划 (2014CB643304)

作者简介: 陈菊娜,女,1981年生,博士生

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引用本文:

陈菊娜,吴佳佳,王鹏,张盾. 脱硫弧菌和溶藻弧菌对船体结构材料907钢海水腐蚀行为的影响研究[J]. 中国腐蚀与防护学报, 2017, 37(5): 402-410.
Juna CHEN, Jiajia WU, Peng WANG, Dun ZHANG. Effect of Desulfovibrio sp. and Vibrio Alginolyticus on Corrosion Behavior of 907 Steel in Seawater. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 402-410.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.024 或 https://www.jcscp.org/CN/Y2017/V37/I5/402

图1 907钢试样在4种不同介质体系中浸泡8 d后的数码照片

图2 907钢试样在4种不同体系中浸泡8 d后的失重数据

图3 907钢试样在溶藻弧菌和混合菌体系中浸泡不同时间的平均失重数据

图4 907钢试样在不同体系中浸泡8 d后腐蚀产物的SEM像

图5 907钢试样在不同体系中浸泡8 d后除去腐蚀产物后的表面SEM像

图6 907钢在4种不同体系中自腐蚀电位随时间的变化曲线

图7 907钢浸泡在不同体系中的Nyquist和Bode图随时间的变化

图8 907钢在4种不同体系中浸泡不同时间的EIS比较

图9 907钢浸泡在不同体系中所对应的等效电路

表1 907钢在不同体系中电化学参数随浸泡时间的变化

图10 907钢在不同体系中Rct随浸泡时间的变化

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