Frontiers in Microbiology (Jul 2019)

Corrosion Acceleration of Printed Circuit Boards With an Immersion Silver Layer Exposed to Bacillus cereus in an Aerobic Medium

  • Yuting Hu,
  • Kui Xiao,
  • Dawei Zhang,
  • Pan Yi,
  • Ruilin Xiong,
  • Chaofang Dong,
  • Jusheng Wu,
  • Xiaogang Li

DOI
https://doi.org/10.3389/fmicb.2019.01493
Journal volume & issue
Vol. 10

Abstract

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In this research, the corrosion behavior of printed circuit boards with an immersion silver layer (PCB-ImAg) exposed to Bacillus cereus bacteria in Luria-Bertani broth was investigated. The growth test demonstrated that B. cereus had a high copper tolerance. Analysis of surface and cross-sectional view of the samples after immersion test indicated that metabolites produced by B. cereus accelerated the microporous corrosion of PCB-ImAg, and the biofilm that adhered to the surface led to oxygen concentration corrosion. Electrochemical impedance spectroscopy tests confirmed that the microbiologically influenced corrosion of PCB-ImAg was related to the biofilm formation and metabolism.

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