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<p>Temporal succession of active and total microbial communities driving microbiologically influenced corrosion (MIC) on copper-nickel (CuNi) 90/10 and titanium (Ti) exposed to natural seawater over 16 weeks was investigated. Electrochemical analysis revealed increasing corrosion resistance of CuNi until 12 weeks, but showed corrosion signs at 16 weeks; Ti exhibited steadily increasing corrosion resistance. Raman spectroscopy confirmed unprotective cupric oxide (CuO) and hydroxide (Cu(OH)₂) presence on CuNi, while Ti maintained protective TiO₂. Pitting analysis identified pits on CuNi but none on Ti. Next-generation sequencing of complementary and genomic DNA identified <i>Halomonas</i> and <i>Marinobacter</i> as early colonizers on CuNi, and increasing species diversity over time. Ti exhibited decreasing diversity, with <i>Aestuariibacter</i>, <i>Methylophaga</i>, and predatory bacteria as early colonizers. Sulfate-reducing and acid-producing bacteria initially showed a declining trend on CuNi but increased from 12 weeks, indicating increased MIC susceptibility; they remained less/undetectable on Ti. Overall, findings highlight the role of early colonizers in driving MIC and distinct microbial succession.</p>

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Temporal succession of microfouling communities in microbiologically influenced corrosion of copper-nickel and titanium in seawater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Kiran Kumar Vadde,
  • Jorge Escribano,
  • Alejandro Morales Betancourt,
  • Oladis Troconis de Rincón,
  • Jason S. Lee,
  • Brendy Rincón Troconis,
  • Vikram Kapoor

摘要

Temporal succession of active and total microbial communities driving microbiologically influenced corrosion (MIC) on copper-nickel (CuNi) 90/10 and titanium (Ti) exposed to natural seawater over 16 weeks was investigated. Electrochemical analysis revealed increasing corrosion resistance of CuNi until 12 weeks, but showed corrosion signs at 16 weeks; Ti exhibited steadily increasing corrosion resistance. Raman spectroscopy confirmed unprotective cupric oxide (CuO) and hydroxide (Cu(OH)₂) presence on CuNi, while Ti maintained protective TiO₂. Pitting analysis identified pits on CuNi but none on Ti. Next-generation sequencing of complementary and genomic DNA identified Halomonas and Marinobacter as early colonizers on CuNi, and increasing species diversity over time. Ti exhibited decreasing diversity, with Aestuariibacter, Methylophaga, and predatory bacteria as early colonizers. Sulfate-reducing and acid-producing bacteria initially showed a declining trend on CuNi but increased from 12 weeks, indicating increased MIC susceptibility; they remained less/undetectable on Ti. Overall, findings highlight the role of early colonizers in driving MIC and distinct microbial succession.