Pitting corrosion control of aluminum 2024 using protective biofilms that secrete corrosion inhibitors

被引:0
|
作者
Örnek, D [1 ]
Wood, TK
Hsu, CH
Sun, Z
Mansfeld, F
机构
[1] Univ Connecticut, Dept Chem Engn, Bioremediat & Appl Biotechnol Lab, Storrs, CT 06269 USA
[2] Univ So Calif, Dept Mat Sci & Engn, CEEL, Los Angeles, CA 90089 USA
关键词
Al; 2024; artificial seawater; biofilms; corrosion potential; electrochemical impedance spectroscopy; inhibitors;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The corrosion behavior of Al2024-T3 (UNS A92024) exposed to artificial seawater (AS) and Luria Bertani (LB) medium has been studied using electrochemical impedance spectroscopy (EIS), Tests were performed in sterile media and in the presence of three different biofilm-forming bacteria: a Bacillus subtilis biofilm that was genetically engineered to produce either polyaspartate or polyglutamate, a Bacillus licheniformis bacterial biofilm that naturally produces gamma-polyglutamate, and an Escherichia. colt biofilm that was genetically engineered to produce polyphosphate. A significant reduction in active pit growth rates and an ennoblement of the corrosion potential (E-corr) were observed in both media in the presence of these biofilms, which produce corrosion inhibitors. The lowest corrosion rates of Al 2024 exposed to the LB medium were observed in the presence of the B. subtilis bacterial biofilm-producing polyaspartate and the E. coli bacterial biofilm that produced polyphosphate. In the presence of the latter biofilm, E-corr was more positive by similar to400 mV than in the sterile solution.
引用
收藏
页码:761 / 767
页数:7
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