摘要
采用开路电位测试、电化学交流阻抗和扫描电镜研究了枝孢霉菌对A3钢腐蚀的影响。电化学测试的结果表明,枝孢霉菌的存在影响了A3钢的电化学行为。在浸泡的0至7天内无菌体系和枝孢霉菌体系的开路电位均先正移后负移,浸泡的第2天和7天时A3钢在有菌体系中的开路电位与相同浸泡天数的无菌体系相比较负,金属表面表现出比无菌体系较高的电化学活性,15天时无菌体系的开路电位基本趋于稳定而枝孢霉菌体系中的开路电位则正移25mV左右。交流阻抗测试结果在浸泡的第2,7天与开路电位结果相符,A3钢在枝孢霉菌体系中15天时的阻抗值明显小于无菌体系。扫描电镜观察结果表明,15天浸泡试验结束后,无菌体系中A3钢表面发生了龟裂,枝孢霉菌体系中试片表面发生了严重的点蚀坑,枝孢霉菌的存在改变了A3钢的腐蚀形貌,加剧了A3钢的腐蚀。
The influence of cladosporium on the corrosion behaviors of Steel A3 was studied using open circuit potential（Eocp）, Electrochemical Impedance Spectroscopy（EIS） and Scanning Electron Microscopy （SEM）. The results of electrochemical test indicated that the electrochemical behaviors of steel A3 were influenced by the present of cladosporium. Eocp of the systems with and without bacteria all shifted positively at first, and then negatively during the 7 days of immersion. After 2 days and 7 days of immersion, Eocp in the system with cladosporium was more negative than that in the sterile medium on the same day, which showing a higher electrochemical activity on the metal surface. On the 15^th day of immersion, Eocp in the system without bacteria going to steady while Eocp in the system with bacteria shifted to positive about 25mV. The results of EIS were consistent with the results of Eocp on the 2^nd and 7^th day. Samples in the system with cladosporium reached a lower resistance value than in the sterile medium on the 15th day. SEM results showed that crazing occurred on steel A3 in the sterile medium while serious pitting corrosion occurred on the metal surface in the system with cladosporium; the present of cladosporium changed the corrosion morphology and accelerated the corrosion of steel A3.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2008年第7期55-58,共4页
Journal of Materials Engineering
关键词
微生物腐蚀
枝孢霉菌
交流阻抗
MIC, steel A3
cladosporium
electrochemical impedance spectroscopy （EIS）
