海水环境中弧菌对45钢腐蚀行为及力学性能的影响

中国腐蚀与防护学报

2012, Vol. 32

Issue (4): 343-348

研究报告

本期目录 | 过刊浏览

海水环境中弧菌对45钢腐蚀行为及力学性能的影响

吴进怡,罗琦,肖伟龙,柴柯,曹阳

海南优势资源化工材料应用技术教育部重点实验室海南大学材料与化工学院海口 570228

INFLUENCE OF VIBRIO ON CORROSION BEHAVIORS AND MECHANICAL PROPERTIES OF 45 STEEL IN SEAWATER

WU Jinyi, LUO Qi, XIAO Weilong, CHAI Ke, Cao Yang

Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, Material and Chemical Engineering College, Hainan University, Haikou 570228

全文: PDF(1120 KB)

摘要: 通过热带海洋气候条件下在海水中培养弧菌，并对比45钢在自然海水、无菌海水和弧菌海水中的腐蚀行为，研究了弧菌对45钢腐蚀行为及力学性能的影响。结果表明，弧菌可以接种于海水中大量培养至高浓度(非培养基中培养)，避免了培养基成分的缓蚀作用，从而更接近碳钢的自然腐蚀状态。海水中弧菌对45钢的平均腐蚀速率及力学性能有显著的影响。弧菌能加速45钢的平均腐蚀速率，但微生物的协同作用比单种弧菌更能加速材料的平均腐蚀速率。弧菌能显著降低局部pH值，引起材料表面严重的局部腐蚀，材料表面局部腐蚀促使其在拉伸过程中应力集中而发生断裂。

关键词 ：海水, 弧菌, 45钢, 腐蚀, 力学性能

Abstract：It has been found that microbiologically influenced corrosion (MIC) plays a significant role in corrosion process of steels exposed in marine environment. Microbe can produce pitting, crevice corrosion, selective dealloying and stress-oriented hydrogen-induced cracking, which accelerates both localized and average corrosion rates of carbon steel. Wu et al. reported that when the corrosion time is 365 d, the average corrosion depth of 25 steel in natural seawater is 2.6 times higher than that in sterile seawater, and localized attack is also observed on the specimens immersed in natural seawater. Preliminary work also shows that Vibrio is the key component of microbe in the corrosion product. The research on the single effect of Vibrio on the corrosion behaviors and mechanical properties of metal is insufficient up to now. In this work, Vibrio is cultured in seawater. 45 steel coupons are immersed in three different mediums in tropic condition: natural seawater, sterile seawater and Vibrio-containing seawater. The results show that instead of culturing in culture medium, Vibrio can be cultured in seawater to a high concentration, which avoid the corrosion inhibitor behavior from culture medium and near natural corrosion condition. The activity of Vibrio at the interface accelerates the average corrosion rate for 45 steel. Coupons immersed in natural seawater show faster average corrosion rate than in Vibrio-containing seawater due to microbial synergy. Vibrio is acid-producing bacteria which can decrease the local pH value and cause significant local corrosion. Local corrosion in the surface of metal would lead to stress concentration on the local corrosion site and cut down the tensile strength of material.

Key words： seawater Vibrio 45 steel corrosion mechanical properties

收稿日期: 2011-09-16

ZTFLH:

TG172.5

基金资助:

国家自然科学基金(50761004和51161007)、海南省自然科学基金(510204和511112)、海南大学2005和2009 年科研项目(Kyjj0536和hd09xm77)资助

通讯作者: 吴进怡 E-mail: wujinyi1976@yahoo.com.cn

Corresponding author: WU Jinyi E-mail: wujinyi1976@yahoo.com.cn

作者简介: 吴进怡，女，1976年生，副教授，研究方向为热带海洋气候下金属的生物腐蚀与防护

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引用本文:

吴进怡,罗琦,肖伟龙,柴柯,曹阳. 海水环境中弧菌对45钢腐蚀行为及力学性能的影响[J]. 中国腐蚀与防护学报, 2012, 32(4): 343-348.
WU Jin-Yi, XIAO Wei-Long, CI Ke, YANG Yu-Hui. INFLUENCE OF VIBRIO ON CORROSION BEHAVIORS AND MECHANICAL PROPERTIES OF 45 STEEL IN SEAWATER. J Chin Soc Corr Pro, 2012, 32(4): 343-348.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I4/343

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