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Open AccessArticle

Effect of Tidal Cycles on Bacterial Biofilm Formation and Biocorrosion of Stainless Steel AISI 316L

1
Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, 8330025 Santiago Centro, Santiago, Chile
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Marine Energy Research & Innovation Center (MERIC), 7550268 Las Condes, Santiago, Chile
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Departamento de Ingeniería Mecánica y Metalúrgica, Facultad de Ingeniería, Pontificia Universidad Católica de Chile, 7820436 Macul, Santiago, Chile
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Departamento de Ingeniería Hidráulica y Ambiental, Facultad de Ingeniería, Pontificia Universidad Católica de Chile, 7820436 Macul, Santiago, Chile
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Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, 7820436 Macul, Santiago, Chile
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(2), 124; https://doi.org/10.3390/jmse8020124
Received: 8 January 2020 / Revised: 10 February 2020 / Accepted: 12 February 2020 / Published: 15 February 2020
(This article belongs to the Section Marine Biology)
The effects of tidal cycles associated with the water level on the biocorrosion of stainless steel AISI 316L were studied. Steel coupons were exposed to different conditions of immersion in mesocosms fed by fresh seawater either continuously or in accordance with the periodicity of natural tides. After 5 and 15 weeks, all coupons were found to have undergone ennoblement associated with the formation of a biofilm. Analysis of the composition of the bacterial community using denaturing gradient gel electrophoresis (DGGE) revealed differences in the biological succession. After 15 weeks, exposure to the simulated tidal conditions resulted in biofilms with lesser bacterial richness; the corresponding rate of corrosion, as determined by weight loss, was about 40 times lower compared to the case for the continuous exposure to seawater. Phylogenetic analysis of selected DGGE bands and the inspection of biofilm morphologies revealed that the faster rate of corrosion was associated with the presence of iron-oxidizing Zetaproteobacteria and eukaryotic photosynthetic microorganisms. On the other hand, intermittent exposure to seawater resulted in the succession of microorganisms resistant to the stress associated with sudden environmental changes, which was associated with a low rate of corrosion. View Full-Text
Keywords: stainless steel; SEM; polarization; weight loss; microbiological corrosion stainless steel; SEM; polarization; weight loss; microbiological corrosion
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MDPI and ACS Style

Daille, L.K.; Aguirre, J.; Fischer, D.; Galarce, C.; Armijo, F.; Pizarro, G.E.; Walczak, M.; De la Iglesia, R.; Vargas, I.T. Effect of Tidal Cycles on Bacterial Biofilm Formation and Biocorrosion of Stainless Steel AISI 316L. J. Mar. Sci. Eng. 2020, 8, 124.

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