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

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

JOURNAL=Frontiers in Microbiology

VOLUME=10

YEAR=2019

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2019.01493

DOI=10.3389/fmicb.2019.01493

ISSN=1664-302X

ABSTRACT=<p>In this research, the corrosion behavior of printed circuit boards with an immersion silver layer (PCB-ImAg) exposed to <italic>Bacillus cereus</italic> bacteria in Luria-Bertani broth was investigated. The growth test demonstrated that <italic>B. cereus</italic> had a high copper tolerance. Analysis of surface and cross-sectional view of the samples after immersion test indicated that metabolites produced by <italic>B. cereus</italic> 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.</p>