Corrosion Inhibition of X80 Steel in Simulated Marine Environment with Marinobacter aquaeolei

M.Saleem Khan^1,2，Dake Xu³，Dan Liu³，Yassir Lekbach⁴，Ke Yang¹，Chunguang Yang¹

1. Institute of Metal Research , Chinese Academy of Sciences2. University of Chinese Academy of Sciences3. Corrosion and Protection Division, Shenyang National Laboratory for Material Sciences , Northeastern University4. Laboratory of Microbial Biotechnology, Faculty of Science and Technology , Sidi Mohamed Ben Abdellah University

摘 要：In the present study, a novel bacterium（ Marinobacter aquaeolei） was examined for its corrosion inhibiting behaviour against X80 pipeline steel. Electrochemical results showed that X80 steel immersed in the solution inoculated with M. aquaeolei possessed very high corrosion resistance compared to that of abiotic control. Besides, scanning electron microscopy, confocal laser scanning microscopy and energy-dispersive X-ray spectroscopy were employed to analyse the corrosion product and the biofi lm formed on the metal surface. Fourier-transform infrared spectroscopy was also applied to determine the composition of extracellular polymeric substances（EPS）. Above results indicated that the corrosion inhibition effciency observed in biotic medium was very high（91%）, proving that M. aquaeolei was an effective inhibitive agent for the corrosion of carbon steel. The inhibition was credited to the formation of bacterial biofi lm and the compact protective layer of the secreted EPS. Thus, this study will introduce a natural, environmentally friendly and cost-effective system for the corrosion control of the carbon steel.

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