Relationship between cathodic current and microorganism on stainless steel in seawater

Naoki Washizu, Tadashi Shinohara, Shin Ichi Motoda, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    Abstract

    Cathodic currents measurements and biological analysis were conducted for type 329J4L stainless steel exposed to natural seawater for the purpose of finding a factor in microbiological promotion of crevice corrosion propagation. The cathodic current density measured at 0.2 V vs. SHE rose from values below 0.1 μA/cm 2 and became higher than 2 μA/cm 2 in summer. However, there was no obvious rise in cathodic current densities and their values were lower than 0.1 μA/cm 2 at the other seasons. 16S rRNA gene analysis revealed that bacteria belonging to Genus Algibacter or Class Gammaproteobacteria were specific to biofilms on the sample with the rise in the cathodic current density above 2 μA/cm 2 in summer. The population of all kinds of bacteria did not have positive effect on cathodic currents. It is, therefore, concluded that large cathodic currents resulting in high corrosion rate are mainly induced by the action of specific bacteria, and that there is a possibility of Algibacter or Gammaproteobacteria having action to enlarge cathodic currents.

    Original languageEnglish
    Pages (from-to)234-240
    Number of pages7
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume58
    Issue number6
    DOIs
    Publication statusPublished - 2009 Jun

    Keywords

    • 16S rRNA gene analysis
    • Algibacter
    • Biofilm
    • Corrosion rate
    • Gammaproteobacteria
    • Type 329J4L

    ASJC Scopus subject areas

    • Electrochemistry
    • Materials Chemistry
    • Metals and Alloys
    • Surfaces, Coatings and Films

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