The corrosion behaviour of CuAl10Fe3 was investigated for 120 h in 0.1 M NaCl solution in three different conditions i) presence of active Pseudomonas fluorescens; ii) filtered metabolites; iii) sterilized solution. Electrochemical and physical-chemical characterizations were performed. Bacteria growth and metabolism were verified by UFC count and RNA transcriptomics. Results indicate that the aerobic P. fluorescens, despite expressing aggressive pyocyanin, induces a complex corrosion inhibition mechanism promoting the growth of protective Al, Cu, and Fe corrosion oxides-hydroxides. On the contrary, filtered metabolites do not consume oxygen and allow an intermetallic re-precipitation of less protective hydroxychlorides, increasing the corrosion rate.
Ghiara, G., Spotorno, R., Delsante, S., Formicola, F., Franzetti, A., Cristiani, P. (2022). Opposite corrosion behaviour of aluminum bronze induced by Pseudomonas fluorescens and its metabolites. CORROSION SCIENCE, 208(November 2022) [10.1016/j.corsci.2022.110656].
Opposite corrosion behaviour of aluminum bronze induced by Pseudomonas fluorescens and its metabolites
Formicola, F;Franzetti, A;
2022
Abstract
The corrosion behaviour of CuAl10Fe3 was investigated for 120 h in 0.1 M NaCl solution in three different conditions i) presence of active Pseudomonas fluorescens; ii) filtered metabolites; iii) sterilized solution. Electrochemical and physical-chemical characterizations were performed. Bacteria growth and metabolism were verified by UFC count and RNA transcriptomics. Results indicate that the aerobic P. fluorescens, despite expressing aggressive pyocyanin, induces a complex corrosion inhibition mechanism promoting the growth of protective Al, Cu, and Fe corrosion oxides-hydroxides. On the contrary, filtered metabolites do not consume oxygen and allow an intermetallic re-precipitation of less protective hydroxychlorides, increasing the corrosion rate.
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