Pitting corrosion inhibition of aluminum 2024 by Bacillus biofilms secreting polyaspartate or γ-polyglutamate

D. Örnek; A. Jayaraman; B. Syrett; C. H. Hsu; F. Mansfeld; T. Wood

doi:10.1007/s00253-002-0942-7

Pitting corrosion inhibition of aluminum 2024 by Bacillus biofilms secreting polyaspartate or γ-polyglutamate

D. Örnek, A. Jayaraman, B. Syrett, C. H. Hsu, F. Mansfeld, T. Wood

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Abstract

Pitting corrosion of aluminum 2024 in Luria Bertani medium was reduced by the secretion of anionic peptides by engineered and natural Bacillus biofilms and was studied in continuous reactors using electrochemical impedance spectroscopy. Compared to sterile controls, pitting was reduced dramatically by the presence of the biofilms. The secretion of a 20 amino acid polyaspartate peptide by an engineered Bacillus subtilis WB600/pBE92-Asp biofilm slightly reduced the corrosion rate of the passive aluminum alloy at pH 6.5; however, the secretion of γ-polyglutamate by a Bacillus licheniformis biofilm reduced the corrosion rate by 90% (compared to the B. subtilis WB600/pBE92 biofilm which did not secrete polyaspartate or γ-polyglutamate). The corrosion potential (E_corr) of aluminum 2024 was increased by about 0.15-0.44 V due to the formation of B. subtilis and B. licheniformis biofilms as compared to sterile controls. The increase of E_corr and the observed prevention of pitting indicate that the pitting potential (E_pit) had increased. This result and the further decrease of corrosion rates for the passive aluminum alloy suggest that the rate of the anodic metal dissolution reaction was reduced by an inhibitor produced by the biofilms. Purified γ-polyglutamate also decreased the corrosion rates of aluminum 2024.

Original language	English (US)
Pages (from-to)	651-657
Number of pages	7
Journal	Applied Microbiology and Biotechnology
Volume	58
Issue number	5
DOIs	https://doi.org/10.1007/s00253-002-0942-7
State	Published - 2002

All Science Journal Classification (ASJC) codes

Biotechnology
Applied Microbiology and Biotechnology

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10.1007/s00253-002-0942-7

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title = "Pitting corrosion inhibition of aluminum 2024 by Bacillus biofilms secreting polyaspartate or γ-polyglutamate",

abstract = "Pitting corrosion of aluminum 2024 in Luria Bertani medium was reduced by the secretion of anionic peptides by engineered and natural Bacillus biofilms and was studied in continuous reactors using electrochemical impedance spectroscopy. Compared to sterile controls, pitting was reduced dramatically by the presence of the biofilms. The secretion of a 20 amino acid polyaspartate peptide by an engineered Bacillus subtilis WB600/pBE92-Asp biofilm slightly reduced the corrosion rate of the passive aluminum alloy at pH 6.5; however, the secretion of γ-polyglutamate by a Bacillus licheniformis biofilm reduced the corrosion rate by 90% (compared to the B. subtilis WB600/pBE92 biofilm which did not secrete polyaspartate or γ-polyglutamate). The corrosion potential (Ecorr) of aluminum 2024 was increased by about 0.15-0.44 V due to the formation of B. subtilis and B. licheniformis biofilms as compared to sterile controls. The increase of Ecorr and the observed prevention of pitting indicate that the pitting potential (Epit) had increased. This result and the further decrease of corrosion rates for the passive aluminum alloy suggest that the rate of the anodic metal dissolution reaction was reduced by an inhibitor produced by the biofilms. Purified γ-polyglutamate also decreased the corrosion rates of aluminum 2024.",

author = "D. {\"O}rnek and A. Jayaraman and B. Syrett and Hsu, {C. H.} and F. Mansfeld and T. Wood",

note = "Funding Information: Acknowledgements This project is supported by the Electric Power Research Institute (Contract WO8044–05). The generous gifts of Bacillus cloning vectors and advice by Mario W. Chen and Dr. Vasantha Nagarajan of E. I. du Pont de Nemours, Inc. (Wilmington, Del.) are gratefully acknowledged.",

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AU - Örnek, D.

AU - Jayaraman, A.

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AU - Hsu, C. H.

AU - Mansfeld, F.

AU - Wood, T.

N1 - Funding Information: Acknowledgements This project is supported by the Electric Power Research Institute (Contract WO8044–05). The generous gifts of Bacillus cloning vectors and advice by Mario W. Chen and Dr. Vasantha Nagarajan of E. I. du Pont de Nemours, Inc. (Wilmington, Del.) are gratefully acknowledged.

PY - 2002

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N2 - Pitting corrosion of aluminum 2024 in Luria Bertani medium was reduced by the secretion of anionic peptides by engineered and natural Bacillus biofilms and was studied in continuous reactors using electrochemical impedance spectroscopy. Compared to sterile controls, pitting was reduced dramatically by the presence of the biofilms. The secretion of a 20 amino acid polyaspartate peptide by an engineered Bacillus subtilis WB600/pBE92-Asp biofilm slightly reduced the corrosion rate of the passive aluminum alloy at pH 6.5; however, the secretion of γ-polyglutamate by a Bacillus licheniformis biofilm reduced the corrosion rate by 90% (compared to the B. subtilis WB600/pBE92 biofilm which did not secrete polyaspartate or γ-polyglutamate). The corrosion potential (Ecorr) of aluminum 2024 was increased by about 0.15-0.44 V due to the formation of B. subtilis and B. licheniformis biofilms as compared to sterile controls. The increase of Ecorr and the observed prevention of pitting indicate that the pitting potential (Epit) had increased. This result and the further decrease of corrosion rates for the passive aluminum alloy suggest that the rate of the anodic metal dissolution reaction was reduced by an inhibitor produced by the biofilms. Purified γ-polyglutamate also decreased the corrosion rates of aluminum 2024.

AB - Pitting corrosion of aluminum 2024 in Luria Bertani medium was reduced by the secretion of anionic peptides by engineered and natural Bacillus biofilms and was studied in continuous reactors using electrochemical impedance spectroscopy. Compared to sterile controls, pitting was reduced dramatically by the presence of the biofilms. The secretion of a 20 amino acid polyaspartate peptide by an engineered Bacillus subtilis WB600/pBE92-Asp biofilm slightly reduced the corrosion rate of the passive aluminum alloy at pH 6.5; however, the secretion of γ-polyglutamate by a Bacillus licheniformis biofilm reduced the corrosion rate by 90% (compared to the B. subtilis WB600/pBE92 biofilm which did not secrete polyaspartate or γ-polyglutamate). The corrosion potential (Ecorr) of aluminum 2024 was increased by about 0.15-0.44 V due to the formation of B. subtilis and B. licheniformis biofilms as compared to sterile controls. The increase of Ecorr and the observed prevention of pitting indicate that the pitting potential (Epit) had increased. This result and the further decrease of corrosion rates for the passive aluminum alloy suggest that the rate of the anodic metal dissolution reaction was reduced by an inhibitor produced by the biofilms. Purified γ-polyglutamate also decreased the corrosion rates of aluminum 2024.

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Pitting corrosion inhibition of aluminum 2024 by Bacillus biofilms secreting polyaspartate or γ-polyglutamate

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