Microbiologically influenced corrosion of titanium caused by aerobic marine bacterium Pseudomonas aeruginosa
| Autor: | Dake Xu, Ke Yang, Phuri Kalnaowakul, Dan Liu, Enze Zhou, Zhong Li, Yassir Lekbach, M. Saleem Khan, Chunguang Yang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics Scanning electron microscope chemistry.chemical_element 02 engineering and technology 010402 general chemistry medicine.disease_cause 01 natural sciences Corrosion X-ray photoelectron spectroscopy Materials Chemistry Pitting corrosion medicine Polarization (electrochemistry) Pseudomonas aeruginosa Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy chemistry Mechanics of Materials Ceramics and Composites 0210 nano-technology Nuclear chemistry Titanium |
| Zdroj: | Journal of Materials Science & Technology. 35:216-222 |
| ISSN: | 1005-0302 |
| DOI: | 10.1016/j.jmst.2018.08.001 |
| Popis: | Microbiologically influenced corrosion (MIC) is a big threat to the strength and safety of many metallic materials used in different environments throughout the world. The metabolites and bioactivity of the microorganisms cause severe deterioration on the metals. In this study, MIC of pure titanium (Ti) was studied in the presence of a highly corrosive aerobic marine bacterium Pseudomonas aeruginosa. The results obtained from electrochemical test showed that Ti was corrosion resistant in the abiotic culture medium after 14 d, while the increased corrosion current density (icorr) obtained from polarization curves and the decreased charge transfer resistance (Rct) from electrochemical impedance spectroscopy (EIS) indicated the accelerated corrosion of Ti caused by P. aeruginosa biofilm. For further confirmation of the above results, the surface of Ti was investigated using scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS). According to the XPS results, TiO2 was formed in both abiotic and biotic conditions, while unstable oxide Ti2O3 was detected in the presence of P. aeruginosa, leading to the defects in the passive film and localized corrosion. Pitting corrosion was investigated with the help of CLSM, and the largest pit depth found on Ti surface immersed in P. aeruginosa was 1.2 μm. Ti was not immune to MIC caused by P. aeruginosa. |
| Databáze: | OpenAIRE |
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