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Opposite corrosion behavior of aluminum bronze induced by Pseudomonas fluorescens and its metabolites

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#Hydrogen

Publications - ISI Article

Opposite corrosion behavior of aluminum bronze induced by Pseudomonas fluorescens and its metabolites

This work demonstrates the ability of the aerobic microorganism Pseudomonas fluorescens and its metabolites to inhibit or, conversely, induce microbiological corrosion.

The corrosion behavior of CuAl10Fe3 was studied for 120 hours in a 0.1 M NaCl solution under three different conditions:

  • the presence of active Pseudomonas fluorescens;
  • filtered metabolites;
  • sterilized solution.

Electrochemical and physicochemical characterizations were performed, and the growth and metabolism of the bacteria were verified using colony-forming unit (CFU) counts and RNA transcriptomics. The results indicate that P. fluorescens, despite expressing an aggressive pyocyanin, induces a complex corrosion inhibition mechanism that promotes the growth of protective oxide-hydroxides of Al, Cu, and Fe. In contrast, the filtered metabolites of the bacterium do not consume oxygen and allow for less protective intermetallic reprecipitation of hydroxychlorides, increasing the corrosion rate.

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Rif.RSE​

22014181

Destination​

Corrosion Science, Vol. 208, No 110656

Publication Date

13 September 2022

Authors​

G. Ghiara, F. Formicola, A. Franzetti (University of Milan), R. Spotorno, S. Delsante (University of Genoa), P. Cristiani (RSE S.p.A.)

Publication Type

ISI Article

Projects

Hydrogen technologies (Hydrogen)

Target​

Press & Media

Related tags

#Hydrogen

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