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Corrosion effect of Bacillus cereus on X80 pipeline steel in a Beijing soil environment

Résumé : The corrosion of X80 pipeline steel in the presence of Bacillus cereus (B. cereus) was studied through electrochemical and surface analyses and live/dead staining. Scanning electron microscopy and live/dead straining results showed that a number of B. cereus adhered to the X80 steel. Electrochemical impedance spectroscopy showed that B. cereus could accelerate the corrosion of X80 steel. In addition, surface morphology observations indicated that B. cereus could accelerate pitting corrosion in X80 steel. The depth of the largest pits due to B. cereus was approximately 11.23μm. Many pits were found on the U-shaped bents and cracks formed under stress after 60days of immersion in the presence of B. cereus. These indicate that pitting corrosion can be accelerated by B. cereus. X-ray photoelectron spectroscopy results revealed that NH4+ existed on the surface of X80 steel. B. cereus is a type of nitrate-reducing bacteria and hence the corrosion mechanism of B. cereus may involve nitrate reduction on the X80 steel.
Domaine de référence : Biocorrosion
Auteur Wan Hongxia, Song Dongdong, Zhang Dawei, Du Cuiwei, Xu Dake, Liu Zhiyong, Ding De, Li Xiaogang
Année de parution : 2018.
Mots-clés : Bacillus cereus, Bacterial Adhesion, Beijing, Biofilm, Biofilms, Corrosion, Nitrates, NRB, Oil and Gas Industry, Oxidation-Reduction, Pitting, Soil Microbiology, Steel, X80 pipeline steel.
Type de document : Article de revue.
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Ce projet est financé par le Fonds Européen de Développement Régional, la Région Normandie et le Conseil Départemental de la Manche.