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| Corrosion Behavior of 2A12 Aluminum Alloy in Combined Environment of Three Typical Bacterial Species |
| Received:August 16, 2019 Revised:October 22, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.02.003 |
| KeyWord:compound bacteria corrosion electrochemistry microstructure |
| Author | Institution |
| ZHANG Hong-bo |
Institute of Air Combat Systems, Naval Research Academy, Shanghai , China |
| ZHANG Yong |
Qingdao Branch of Naval Aeronautical University, Qingdao, , China |
| FAN Wei-jie |
Qingdao Branch of Naval Aeronautical University, Qingdao, , China |
| LIU Hong-xi |
Qingdao Branch of Naval Aeronautical University, Qingdao, , China |
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| Abstract: |
| The paper aims to study the corrosion behavior of 2A12 aluminum alloy, a common material for aircraft, under the compound environment with three typical strains, namely, sulfate reducing bacteria, iron bacteria and thiobacterium denitrifides. The compound bacteria environment in the internal closed parts of airplane was reproduced and the electrochemical properties and macro microstructure of 2A12 aluminum alloy were characterized through electrochemical impedance, potentiodynamic polarization curve and stered microscope, revealing the 2A12 aluminum alloy corrosion degree in conformity with colony and the effect of compound colony over time. Compared with the blank test, it was found that there were obvious cracks and corrosion pits on the surface of 2A12 aluminum alloy under the compound bacteria environment, and some corrosion products and microbial film residues were found in the corrosion pores. In the compound bacterial solution, the minimum corrosion current density was 1.12×10-6 A/cm2, and the maximum was 2.43×10-6 A/cm2. The corrosion rate of 2A12 aluminum alloy is 62.79 times as high as that of the control group and the corrosion depth is 3.41 times as high as that of the control group under the combined environment of three typical bacterial species. The rule of the influence of compound colonies on the corrosion of 2A12 aluminum alloy is related to the types of colonies, metabolic characteristics and the interaction among various colonies. |
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